diff --git a/Bugsnag.xcodeproj/project.pbxproj b/Bugsnag.xcodeproj/project.pbxproj
index d1843abe5..2907142e6 100644
--- a/Bugsnag.xcodeproj/project.pbxproj
+++ b/Bugsnag.xcodeproj/project.pbxproj
@@ -721,6 +721,14 @@
 		01FF490728BF8B7B001F817B /* BugsnagInternals.h in Headers */ = {isa = PBXBuildFile; fileRef = 01FF490528BF8B7B001F817B /* BugsnagInternals.h */; };
 		01FF490828BF8B7B001F817B /* BugsnagInternals.h in Headers */ = {isa = PBXBuildFile; fileRef = 01FF490528BF8B7B001F817B /* BugsnagInternals.h */; };
 		01FF490928BF8B7B001F817B /* BugsnagInternals.h in Headers */ = {isa = PBXBuildFile; fileRef = 01FF490528BF8B7B001F817B /* BugsnagInternals.h */; };
+		093EB6602AFE447E006EB7E3 /* Swizzle.mm in Sources */ = {isa = PBXBuildFile; fileRef = 093EB65F2AFE447E006EB7E3 /* Swizzle.mm */; };
+		093EB6612AFE447E006EB7E3 /* Swizzle.mm in Sources */ = {isa = PBXBuildFile; fileRef = 093EB65F2AFE447E006EB7E3 /* Swizzle.mm */; };
+		093EB6622AFE447E006EB7E3 /* Swizzle.mm in Sources */ = {isa = PBXBuildFile; fileRef = 093EB65F2AFE447E006EB7E3 /* Swizzle.mm */; };
+		093EB6632AFE447E006EB7E3 /* Swizzle.mm in Sources */ = {isa = PBXBuildFile; fileRef = 093EB65F2AFE447E006EB7E3 /* Swizzle.mm */; };
+		093EB6662AFE4580006EB7E3 /* BSGTestCase.mm in Sources */ = {isa = PBXBuildFile; fileRef = 093EB6652AFE4580006EB7E3 /* BSGTestCase.mm */; };
+		093EB6672AFE4580006EB7E3 /* BSGTestCase.mm in Sources */ = {isa = PBXBuildFile; fileRef = 093EB6652AFE4580006EB7E3 /* BSGTestCase.mm */; };
+		093EB6682AFE4580006EB7E3 /* BSGTestCase.mm in Sources */ = {isa = PBXBuildFile; fileRef = 093EB6652AFE4580006EB7E3 /* BSGTestCase.mm */; };
+		093EB6692AFE4580006EB7E3 /* BSGTestCase.mm in Sources */ = {isa = PBXBuildFile; fileRef = 093EB6652AFE4580006EB7E3 /* BSGTestCase.mm */; };
 		3A700A9424A63ABC0068CD1B /* BugsnagThread.h in Headers */ = {isa = PBXBuildFile; fileRef = 3A700A8024A63A8E0068CD1B /* BugsnagThread.h */; settings = {ATTRIBUTES = (Public, ); }; };
 		3A700A9524A63AC50068CD1B /* BugsnagSession.h in Headers */ = {isa = PBXBuildFile; fileRef = 3A700A8124A63A8E0068CD1B /* BugsnagSession.h */; settings = {ATTRIBUTES = (Public, ); }; };
 		3A700A9624A63AC60068CD1B /* BugsnagStackframe.h in Headers */ = {isa = PBXBuildFile; fileRef = 3A700A8224A63A8E0068CD1B /* BugsnagStackframe.h */; settings = {ATTRIBUTES = (Public, ); }; };
@@ -1539,6 +1547,10 @@
 		01E8765D256684E700F4B70A /* URLSessionMock.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = URLSessionMock.m; sourceTree = "<group>"; };
 		01F9FCB528929336005EDD8C /* BSGSerializationTests.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = BSGSerializationTests.m; sourceTree = "<group>"; };
 		01FF490528BF8B7B001F817B /* BugsnagInternals.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = BugsnagInternals.h; sourceTree = "<group>"; };
+		093EB65E2AFE447E006EB7E3 /* Swizzle.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = Swizzle.h; sourceTree = "<group>"; };
+		093EB65F2AFE447E006EB7E3 /* Swizzle.mm */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.objcpp; path = Swizzle.mm; sourceTree = "<group>"; };
+		093EB6642AFE4580006EB7E3 /* BSGTestCase.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = BSGTestCase.h; sourceTree = "<group>"; };
+		093EB6652AFE4580006EB7E3 /* BSGTestCase.mm */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.objcpp; path = BSGTestCase.mm; sourceTree = "<group>"; };
 		3A700A8024A63A8E0068CD1B /* BugsnagThread.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = BugsnagThread.h; sourceTree = "<group>"; };
 		3A700A8124A63A8E0068CD1B /* BugsnagSession.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = BugsnagSession.h; sourceTree = "<group>"; };
 		3A700A8224A63A8E0068CD1B /* BugsnagStackframe.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = BugsnagStackframe.h; sourceTree = "<group>"; };
@@ -1934,8 +1946,6 @@
 		00AD1C7F24869B0E00A27979 /* BugsnagTests */ = {
 			isa = PBXGroup;
 			children = (
-				CBEC893E2A4ACD230088A3CE /* FileBasedTest.h */,
-				CBEC893F2A4ACD230088A3CE /* FileBasedTest.m */,
 				019480D32625F3EB00E833ED /* BSGAppKitTests.m */,
 				008966BD2486D43500DC48C2 /* BSGClientObserverTests.m */,
 				00896A3F2486DBDD00DC48C2 /* BSGConfigurationBuilderTests.m */,
@@ -1953,6 +1963,8 @@
 				01F9FCB528929336005EDD8C /* BSGSerializationTests.m */,
 				CB6419AA25A73E8C00613D25 /* BSGStorageMigratorV0V1Tests.m */,
 				017DCF9A287422BB000ECB22 /* BSGTelemetryTests.m */,
+				093EB6642AFE4580006EB7E3 /* BSGTestCase.h */,
+				093EB6652AFE4580006EB7E3 /* BSGTestCase.mm */,
 				01DE903B26CEAF9E00455213 /* BSGUtilsTests.m */,
 				CB9103632502320A00E9D1E2 /* BugsnagApiClientTest.m */,
 				E701FA9E2490EF4A008D842F /* BugsnagApiValidationTest.m */,
@@ -1995,9 +2007,13 @@
 				E701FAAE2490EFE8008D842F /* ConfigurationApiValidationTest.m */,
 				01BDB21425DEC02900A91FAF /* Data */,
 				E701FAAA2490EFD9008D842F /* EventApiValidationTest.m */,
+				CBEC893E2A4ACD230088A3CE /* FileBasedTest.h */,
+				CBEC893F2A4ACD230088A3CE /* FileBasedTest.m */,
 				00E636C324878FFC006CBF1A /* Info.plist */,
 				01B14C55251CE55F00118748 /* report-react-native-promise-rejection.json */,
 				008966B72486D43500DC48C2 /* report.json */,
+				093EB65E2AFE447E006EB7E3 /* Swizzle.h */,
+				093EB65F2AFE447E006EB7E3 /* Swizzle.mm */,
 				004E35392487B375007FBAE4 /* Tests-Bridging-Header.h */,
 				CBA22499251E429C00B87416 /* TestSupport.h */,
 				CBA2249A251E429C00B87416 /* TestSupport.m */,
@@ -3149,6 +3165,7 @@
 				0089679F2486D43700DC48C2 /* KSCrashSentry_Tests.m in Sources */,
 				008967872486D43700DC48C2 /* KSCrashSentry_NSException_Tests.m in Sources */,
 				0089679C2486D43700DC48C2 /* KSFileUtils_Tests.m in Sources */,
+				093EB6602AFE447E006EB7E3 /* Swizzle.mm in Sources */,
 				008966EE2486D43700DC48C2 /* BugsnagClientPayloadInfoTest.m in Sources */,
 				010F80C228645B4200D6569E /* BSGDefinesTests.m in Sources */,
 				01BDB1F525DEBFB200A91FAF /* BSGEventUploadKSCrashReportOperationTests.m in Sources */,
@@ -3168,6 +3185,7 @@
 				008967152486D43700DC48C2 /* BugsnagCollectionsTests.m in Sources */,
 				01E8765E256684E700F4B70A /* URLSessionMock.m in Sources */,
 				008967AB2486D43700DC48C2 /* BSG_KSMachTests.m in Sources */,
+				093EB6662AFE4580006EB7E3 /* BSGTestCase.mm in Sources */,
 				0089672A2486D43700DC48C2 /* BugsnagStacktraceTest.m in Sources */,
 				01847DAC26441A5E00ADA4C7 /* BSGInternalErrorReporterTests.m in Sources */,
 				0163BF5925823D8D008DC28B /* BSGNotificationBreadcrumbsTests.m in Sources */,
@@ -3315,6 +3333,7 @@
 				008967822486D43700DC48C2 /* KSSystemInfo_Tests.m in Sources */,
 				008967612486D43700DC48C2 /* BugsnagBreadcrumbsTest.m in Sources */,
 				01DE903D26CEAF9E00455213 /* BSGUtilsTests.m in Sources */,
+				093EB6672AFE4580006EB7E3 /* BSGTestCase.mm in Sources */,
 				CB156242270707740097334C /* KSCrashNames_Test.m in Sources */,
 				008967012486D43700DC48C2 /* BugsnagEventPersistLoadTest.m in Sources */,
 				0089671C2486D43700DC48C2 /* BugsnagSessionTest.m in Sources */,
@@ -3341,6 +3360,7 @@
 				004E353B2487B3B3007FBAE4 /* BugsnagSwiftPublicAPITests.swift in Sources */,
 				0089677C2486D43700DC48C2 /* RFC3339DateTool_Tests.m in Sources */,
 				CBEC89412A4ACD240088A3CE /* FileBasedTest.m in Sources */,
+				093EB6612AFE447E006EB7E3 /* Swizzle.mm in Sources */,
 				01A2958728B667C2005FCC8C /* BSGNetworkBreadcrumbTests.m in Sources */,
 				008967552486D43700DC48C2 /* BugsnagOnCrashTest.m in Sources */,
 				008967A02486D43700DC48C2 /* KSCrashSentry_Tests.m in Sources */,
@@ -3481,6 +3501,7 @@
 				01B6BB7E25D5777F00FC4DE6 /* BugsnagSwiftPublicAPITests.swift in Sources */,
 				0089677A2486D43700DC48C2 /* BSG_KSMachHeadersTests.m in Sources */,
 				0089672C2486D43700DC48C2 /* BugsnagStacktraceTest.m in Sources */,
+				093EB6682AFE4580006EB7E3 /* BSGTestCase.mm in Sources */,
 				008966F32486D43700DC48C2 /* BugsnagMetadataRedactionTest.m in Sources */,
 				008967382486D43700DC48C2 /* BugsnagMetadataTests.m in Sources */,
 				008967832486D43700DC48C2 /* KSSystemInfo_Tests.m in Sources */,
@@ -3514,6 +3535,7 @@
 				008967442486D43700DC48C2 /* BugsnagSessionTrackerStopTest.m in Sources */,
 				CB26E9BC28350E0C005A1865 /* UISceneStub.m in Sources */,
 				008967982486D43700DC48C2 /* KSCrashState_Tests.m in Sources */,
+				093EB6622AFE447E006EB7E3 /* Swizzle.mm in Sources */,
 				008967772486D43700DC48C2 /* XCTestCase+KSCrash.m in Sources */,
 				01A2958828B667C2005FCC8C /* BSGNetworkBreadcrumbTests.m in Sources */,
 				CBEC89422A4ACD240088A3CE /* FileBasedTest.m in Sources */,
@@ -3748,7 +3770,9 @@
 				CB28F0B828294DE1003AB200 /* BSGConfigurationBuilderTests.m in Sources */,
 				CB28F0DB282A4BA6003AB200 /* BugsnagMetadataTests.m in Sources */,
 				CB28F0B028294D4F003AB200 /* KSFileUtils_Tests.m in Sources */,
+				093EB6632AFE447E006EB7E3 /* Swizzle.mm in Sources */,
 				CB28F0DC282A4BEE003AB200 /* BugsnagSessionTrackerTest.m in Sources */,
+				093EB6692AFE4580006EB7E3 /* BSGTestCase.mm in Sources */,
 				CB28F0B728294DE1003AB200 /* BSGFeatureFlagStoreTests.m in Sources */,
 				010F80C528645B4200D6569E /* BSGDefinesTests.m in Sources */,
 				CB28F0A028294D44003AB200 /* BSG_KSFileTests.m in Sources */,
diff --git a/Bugsnag/Helpers/BSGRunContext.m b/Bugsnag/Helpers/BSGRunContext.m
index d48bc6b85..c7ce2a57b 100644
--- a/Bugsnag/Helpers/BSGRunContext.m
+++ b/Bugsnag/Helpers/BSGRunContext.m
@@ -112,8 +112,15 @@ static bool GetIsActive(void) {
 #endif
 
 #if TARGET_OS_WATCH
-    WKExtension *ext = [WKExtension sharedExtension];
-    return ext && ext.applicationState == WKApplicationStateActive;
+    if ([BSG_KSSystemInfo isRunningInAppExtension]) {
+        WKExtension *ext = [WKExtension sharedExtension];
+        return ext && ext.applicationState == WKApplicationStateActive;
+    } else if (@available(watchOS 7.0, *)) {
+        WKApplication *app = [WKApplication sharedApplication];
+        return app && app.applicationState == WKApplicationStateActive;
+    } else {
+        return true;
+    }
 #endif
 }
 
@@ -170,8 +177,15 @@ static bool GetIsForeground(void) {
 #endif
 
 #if TARGET_OS_WATCH
-    WKExtension *ext = [WKExtension sharedExtension];
-    return ext && ext.applicationState != WKApplicationStateBackground;
+    if ([BSG_KSSystemInfo isRunningInAppExtension]) {
+        WKExtension *ext = [WKExtension sharedExtension];
+        return ext && ext.applicationState != WKApplicationStateBackground;
+    } else if (@available(watchOS 7.0, *)) {
+        WKApplication *app = [WKApplication sharedApplication];
+        return app && app.applicationState == WKApplicationStateBackground;
+    } else {
+        return true;
+    }
 #endif
 }
 
diff --git a/BugsnagNetworkRequestPlugin/BugsnagNetworkRequestPluginTests/BugsnagNetworkRequestPluginTests.m b/BugsnagNetworkRequestPlugin/BugsnagNetworkRequestPluginTests/BugsnagNetworkRequestPluginTests.m
index f3ce61d3c..0e11b7ffc 100644
--- a/BugsnagNetworkRequestPlugin/BugsnagNetworkRequestPluginTests/BugsnagNetworkRequestPluginTests.m
+++ b/BugsnagNetworkRequestPlugin/BugsnagNetworkRequestPluginTests/BugsnagNetworkRequestPluginTests.m
@@ -87,6 +87,7 @@ - (void)resetBreadcrumbs {
 }
 
 - (void)setUp {
+    [super setUp];
     [BSGURLSessionTracingDelegate setClient:(id)self];
     [self resetBreadcrumbs];
 }
diff --git a/Tests/BugsnagTests/BSGAppKitTests.m b/Tests/BugsnagTests/BSGAppKitTests.m
index c11002925..565d7bac8 100644
--- a/Tests/BugsnagTests/BSGAppKitTests.m
+++ b/Tests/BugsnagTests/BSGAppKitTests.m
@@ -6,9 +6,9 @@
 //  Copyright © 2021 Bugsnag Inc. All rights reserved.
 //
 
-#import <XCTest/XCTest.h>
+#import "BSGTestCase.h"
 
-@interface BSGAppKitTests : XCTestCase
+@interface BSGAppKitTests : BSGTestCase
 
 @end
 
diff --git a/Tests/BugsnagTests/BSGClientObserverTests.m b/Tests/BugsnagTests/BSGClientObserverTests.m
index 32f165b9c..a9a60f846 100644
--- a/Tests/BugsnagTests/BSGClientObserverTests.m
+++ b/Tests/BugsnagTests/BSGClientObserverTests.m
@@ -6,7 +6,7 @@
 //  Copyright © 2020 Bugsnag. All rights reserved.
 //
 
-#import <XCTest/XCTest.h>
+#import "BSGTestCase.h"
 
 #import "Bugsnag.h"
 #import "BugsnagClient+Private.h"
@@ -15,7 +15,7 @@
 #import "BugsnagMetadata+Private.h"
 #import "BugsnagUser+Private.h"
 
-@interface BSGClientObserverTests : XCTestCase
+@interface BSGClientObserverTests : BSGTestCase
 @property BugsnagClient *client;
 @property BSGClientObserverEvent event;
 @property id value;
@@ -24,6 +24,7 @@ @interface BSGClientObserverTests : XCTestCase
 @implementation BSGClientObserverTests
 
 - (void)setUp {
+    [super setUp];
     BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1];
     self.client = [Bugsnag startWithConfiguration:config];
 
diff --git a/Tests/BugsnagTests/BSGConfigurationBuilderTests.m b/Tests/BugsnagTests/BSGConfigurationBuilderTests.m
index 0aa05ce2c..682c79c32 100644
--- a/Tests/BugsnagTests/BSGConfigurationBuilderTests.m
+++ b/Tests/BugsnagTests/BSGConfigurationBuilderTests.m
@@ -1,4 +1,4 @@
-#import <XCTest/XCTest.h>
+#import "BSGTestCase.h"
 
 #import <Bugsnag/Bugsnag.h>
 #import "BSGConfigurationBuilder.h"
@@ -6,7 +6,7 @@
 #import "BugsnagTestConstants.h"
 #import <TargetConditionals.h>
 
-@interface BSGConfigurationBuilderTests : XCTestCase
+@interface BSGConfigurationBuilderTests : BSGTestCase
 @end
 
 @implementation BSGConfigurationBuilderTests
diff --git a/Tests/BugsnagTests/BSGConnectivityTest.m b/Tests/BugsnagTests/BSGConnectivityTest.m
index 75f18f5f2..7eefe6563 100644
--- a/Tests/BugsnagTests/BSGConnectivityTest.m
+++ b/Tests/BugsnagTests/BSGConnectivityTest.m
@@ -1,9 +1,9 @@
-#import <XCTest/XCTest.h>
+#import "BSGTestCase.h"
 
 #import "BSGConnectivity.h"
 #import "BSGDefines.h"
 
-@interface BSGConnectivityTest : XCTestCase
+@interface BSGConnectivityTest : BSGTestCase
 @end
 
 @implementation BSGConnectivityTest
diff --git a/Tests/BugsnagTests/BSGDefinesTests.m b/Tests/BugsnagTests/BSGDefinesTests.m
index e68b13b38..dc5154542 100644
--- a/Tests/BugsnagTests/BSGDefinesTests.m
+++ b/Tests/BugsnagTests/BSGDefinesTests.m
@@ -6,11 +6,11 @@
 //  Copyright © 2022 Bugsnag Inc. All rights reserved.
 //
 
-#import <XCTest/XCTest.h>
+#import "BSGTestCase.h"
 
 #import "BSGDefines.h"
 
-@interface BSGDefinesTests : XCTestCase
+@interface BSGDefinesTests : BSGTestCase
 
 @end
 
diff --git a/Tests/BugsnagTests/BSGEventUploadKSCrashReportOperationTests.m b/Tests/BugsnagTests/BSGEventUploadKSCrashReportOperationTests.m
index 86a3bf28d..3874b8e99 100644
--- a/Tests/BugsnagTests/BSGEventUploadKSCrashReportOperationTests.m
+++ b/Tests/BugsnagTests/BSGEventUploadKSCrashReportOperationTests.m
@@ -6,13 +6,14 @@
 //  Copyright © 2021 Bugsnag Inc. All rights reserved.
 //
 
+#import "BSGTestCase.h"
+
 #import <Bugsnag/Bugsnag.h>
-#import <XCTest/XCTest.h>
 
 #import "BSGEventUploadKSCrashReportOperation.h"
 #import "BSGInternalErrorReporter.h"
 
-@interface BSGEventUploadKSCrashReportOperationTests : XCTestCase
+@interface BSGEventUploadKSCrashReportOperationTests : BSGTestCase
 
 @property NSString *errorClass;
 @property NSString *context;
diff --git a/Tests/BugsnagTests/BSGFeatureFlagStoreTests.m b/Tests/BugsnagTests/BSGFeatureFlagStoreTests.m
index 8144687d6..296f8cfd5 100644
--- a/Tests/BugsnagTests/BSGFeatureFlagStoreTests.m
+++ b/Tests/BugsnagTests/BSGFeatureFlagStoreTests.m
@@ -6,11 +6,11 @@
 //  Copyright © 2021 Bugsnag Inc. All rights reserved.
 //
 
-#import "BSGFeatureFlagStore.h"
+#import "BSGTestCase.h"
 
-#import <XCTest/XCTest.h>
+#import "BSGFeatureFlagStore.h"
 
-@interface BSGFeatureFlagStoreTests : XCTestCase
+@interface BSGFeatureFlagStoreTests : BSGTestCase
 
 @end
 
diff --git a/Tests/BugsnagTests/BSGInternalErrorReporterTests.m b/Tests/BugsnagTests/BSGInternalErrorReporterTests.m
index 2948d5154..a9f75b620 100644
--- a/Tests/BugsnagTests/BSGInternalErrorReporterTests.m
+++ b/Tests/BugsnagTests/BSGInternalErrorReporterTests.m
@@ -6,7 +6,7 @@
 //  Copyright © 2021 Bugsnag Inc. All rights reserved.
 //
 
-#import <XCTest/XCTest.h>
+#import "BSGTestCase.h"
 
 #import <Bugsnag/Bugsnag.h>
 
@@ -18,7 +18,7 @@
 #import "BugsnagNotifier.h"
 #import "BSGPersistentDeviceID.h"
 
-@interface BSGInternalErrorReporterTests : XCTestCase
+@interface BSGInternalErrorReporterTests : BSGTestCase
 
 @property (nonatomic) BugsnagConfiguration *configuration;
 
@@ -27,6 +27,7 @@ @interface BSGInternalErrorReporterTests : XCTestCase
 @implementation BSGInternalErrorReporterTests
 
 - (void)setUp {
+    [super setUp];
 #pragma clang diagnostic push
 #pragma clang diagnostic ignored "-Wnonnull"
     [BSGInternalErrorReporter setSharedInstance:nil];
diff --git a/Tests/BugsnagTests/BSGJSONSerializationTests.m b/Tests/BugsnagTests/BSGJSONSerializationTests.m
index 531768040..2f37482e2 100644
--- a/Tests/BugsnagTests/BSGJSONSerializationTests.m
+++ b/Tests/BugsnagTests/BSGJSONSerializationTests.m
@@ -6,11 +6,11 @@
 //  Copyright © 2020 Bugsnag Inc. All rights reserved.
 //
 
-#import <XCTest/XCTest.h>
+#import "BSGTestCase.h"
 
 #import "BSGJSONSerialization.h"
 
-@interface BSGJSONSerializationTests : XCTestCase
+@interface BSGJSONSerializationTests : BSGTestCase
 @end
 
 @implementation BSGJSONSerializationTests
diff --git a/Tests/BugsnagTests/BSGNetworkBreadcrumbTests.m b/Tests/BugsnagTests/BSGNetworkBreadcrumbTests.m
index e488e03e7..d52968b5d 100644
--- a/Tests/BugsnagTests/BSGNetworkBreadcrumbTests.m
+++ b/Tests/BugsnagTests/BSGNetworkBreadcrumbTests.m
@@ -5,11 +5,11 @@
 //  Created by Nick Dowell on 22/09/2021.
 //
 
-#import "BSGNetworkBreadcrumb.h"
+#import "BSGTestCase.h"
 
-#import <XCTest/XCTest.h>
+#import "BSGNetworkBreadcrumb.h"
 
-@interface BSGNetworkBreadcrumbTests : XCTestCase
+@interface BSGNetworkBreadcrumbTests : BSGTestCase
 
 @end
 
diff --git a/Tests/BugsnagTests/BSGNotificationBreadcrumbsTests.m b/Tests/BugsnagTests/BSGNotificationBreadcrumbsTests.m
index efef0cf7c..98a3614b5 100644
--- a/Tests/BugsnagTests/BSGNotificationBreadcrumbsTests.m
+++ b/Tests/BugsnagTests/BSGNotificationBreadcrumbsTests.m
@@ -6,7 +6,7 @@
 //  Copyright © 2020 Bugsnag Inc. All rights reserved.
 //
 
-#import <XCTest/XCTest.h>
+#import "BSGTestCase.h"
 
 #import <Bugsnag/Bugsnag.h>
 
@@ -19,7 +19,7 @@
 #endif
 
 
-@interface BSGNotificationBreadcrumbsTests : XCTestCase <BSGBreadcrumbSink>
+@interface BSGNotificationBreadcrumbsTests : BSGTestCase <BSGBreadcrumbSink>
 
 @property NSNotificationCenter *notificationCenter;
 @property id notificationObject;
@@ -114,6 +114,7 @@ @implementation BSGNotificationBreadcrumbsTests
 #pragma mark Setup
 
 - (void)setUp {
+    [super setUp];
     self.breadcrumb = nil;
     BugsnagConfiguration *configuration = [[BugsnagConfiguration alloc] initWithApiKey:@"0192837465afbecd0192837465afbecd"];
     self.notificationBreadcrumbs = [[BSGNotificationBreadcrumbs alloc] initWithConfiguration:configuration breadcrumbSink:self];
diff --git a/Tests/BugsnagTests/BSGOutOfMemoryTests.m b/Tests/BugsnagTests/BSGOutOfMemoryTests.m
index aeda8869e..8cafa6c4f 100644
--- a/Tests/BugsnagTests/BSGOutOfMemoryTests.m
+++ b/Tests/BugsnagTests/BSGOutOfMemoryTests.m
@@ -1,4 +1,4 @@
-#import <XCTest/XCTest.h>
+#import "BSGTestCase.h"
 
 #import "BSGFileLocations.h"
 #import "BSGRunContext.h"
@@ -10,7 +10,7 @@
 #import "BugsnagSystemState.h"
 #import "BugsnagTestConstants.h"
 
-@interface BSGOutOfMemoryTests : XCTestCase
+@interface BSGOutOfMemoryTests : BSGTestCase
 @end
 
 @implementation BSGOutOfMemoryTests
diff --git a/Tests/BugsnagTests/BSGRunContextTests.m b/Tests/BugsnagTests/BSGRunContextTests.m
index 0fb7ee656..beda07936 100644
--- a/Tests/BugsnagTests/BSGRunContextTests.m
+++ b/Tests/BugsnagTests/BSGRunContextTests.m
@@ -6,18 +6,19 @@
 //  Copyright © 2022 Bugsnag Inc. All rights reserved.
 //
 
-#import <XCTest/XCTest.h>
+#import "BSGTestCase.h"
 
 #import "BSGFileLocations.h"
 #import "BSGRunContext.h"
 
-@interface BSGRunContextTests : XCTestCase
+@interface BSGRunContextTests : BSGTestCase
 
 @end
 
 @implementation BSGRunContextTests
 
 - (void)setUp {
+    [super setUp];
     if (!bsg_runContext) {
         BSGRunContextInit(BSGFileLocations.current.runContext);
     }
diff --git a/Tests/BugsnagTests/BSGSerializationTests.m b/Tests/BugsnagTests/BSGSerializationTests.m
index c36621781..1b5dce9ed 100644
--- a/Tests/BugsnagTests/BSGSerializationTests.m
+++ b/Tests/BugsnagTests/BSGSerializationTests.m
@@ -6,11 +6,11 @@
 //  Copyright © 2022 Bugsnag Inc. All rights reserved.
 //
 
-#import <XCTest/XCTest.h>
+#import "BSGTestCase.h"
 
 #import "BSGSerialization.h"
 
-@interface BSGSerializationTests : XCTestCase
+@interface BSGSerializationTests : BSGTestCase
 
 @end
 
diff --git a/Tests/BugsnagTests/BSGStorageMigratorV0V1Tests.m b/Tests/BugsnagTests/BSGStorageMigratorV0V1Tests.m
index 1c928d61c..f4e857a8d 100644
--- a/Tests/BugsnagTests/BSGStorageMigratorV0V1Tests.m
+++ b/Tests/BugsnagTests/BSGStorageMigratorV0V1Tests.m
@@ -6,13 +6,14 @@
 //  Copyright © 2021 Bugsnag Inc. All rights reserved.
 //
 
-#import <XCTest/XCTest.h>
+#import "BSGTestCase.h"
+
 #import "BSGStorageMigratorV0V1.h"
 #import "BugsnagClient+Private.h"
 #import "BugsnagConfiguration+Private.h"
 #import "BugsnagTestConstants.h"
 
-@interface BSGStorageMigratorV0V1Tests : XCTestCase
+@interface BSGStorageMigratorV0V1Tests : BSGTestCase
 
 @end
 
@@ -79,6 +80,7 @@ - (NSDictionary *)getFiles {
 }
 
 - (void)setUp {
+    [super setUp];
     NSFileManager *fm = [NSFileManager defaultManager];
     NSBundle *bundle = [NSBundle bundleForClass:[self class]];
     NSString *cachesPath = [self getCachesDir];
diff --git a/Tests/BugsnagTests/BSGTelemetryTests.m b/Tests/BugsnagTests/BSGTelemetryTests.m
index 264cdecc5..889697bd6 100644
--- a/Tests/BugsnagTests/BSGTelemetryTests.m
+++ b/Tests/BugsnagTests/BSGTelemetryTests.m
@@ -6,14 +6,14 @@
 //  Copyright © 2022 Bugsnag Inc. All rights reserved.
 //
 
-#import <XCTest/XCTest.h>
+#import "BSGTestCase.h"
 
 #import <Bugsnag/Bugsnag.h>
 
 #import "BSGTelemetry.h"
 #import "BugsnagTestConstants.h"
 
-@interface BSGTelemetryTests : XCTestCase
+@interface BSGTelemetryTests : BSGTestCase
 
 @end
 
diff --git a/Tests/BugsnagTests/BSGTestCase.h b/Tests/BugsnagTests/BSGTestCase.h
new file mode 100644
index 000000000..1986a7fe4
--- /dev/null
+++ b/Tests/BugsnagTests/BSGTestCase.h
@@ -0,0 +1,17 @@
+//
+//  BSGTestCase.h
+//  Bugsnag
+//
+//  Created by Karl Stenerud on 10.11.23.
+//  Copyright © 2023 Bugsnag Inc. All rights reserved.
+//
+
+#import <XCTest/XCTest.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface BSGTestCase : XCTestCase
+
+@end
+
+NS_ASSUME_NONNULL_END
diff --git a/Tests/BugsnagTests/BSGTestCase.mm b/Tests/BugsnagTests/BSGTestCase.mm
new file mode 100644
index 000000000..91008a43d
--- /dev/null
+++ b/Tests/BugsnagTests/BSGTestCase.mm
@@ -0,0 +1,91 @@
+//
+//  BSGTestCase.m
+//  Bugsnag
+//
+//  Created by Karl Stenerud on 10.11.23.
+//  Copyright © 2023 Bugsnag Inc. All rights reserved.
+//
+
+#import "BSGTestCase.h"
+#import "Swizzle.h"
+#import <stdatomic.h>
+
+using namespace bugsnag;
+
+@interface BSGWatchKitBundle: NSProxy
+
+@property(nonatomic,readwrite) NSBundle *bundle;
+@property(nonatomic,readwrite) NSDictionary *dict;
+
+- (instancetype) initWithBundle:(NSBundle *)bundle;
+
+@end
+
+@implementation BSGWatchKitBundle
+
+- (instancetype) initWithBundle:(NSBundle *)bundle {
+    // Force the main bundle's dictionary to have an NSExtension section on WatchOS.
+    // This is necessary because the unit tests run in an extension environment but
+    // don't set this field that is normally present in a real environment, which
+    // confuses our extension detection code in
+    // Bugsnag/KSCrash/Source/KSCrash/Recording/BSG_KSSystemInfo.m
+    NSMutableDictionary *dict = [NSBundle.mainBundle.infoDictionary mutableCopy];
+    if (dict[@"NSExtension"] == nil) {
+        dict[@"NSExtension"] = @{
+            @"NSExtensionAttributes": @{
+                @"WKAppBundleIdentifier": @"com.bugsnag.swift-watchos.watchkitapp",
+            },
+            @"NSExtensionPointIdentifier": @"com.apple.watchkit",
+        };
+    }
+    _dict = dict;
+    _bundle = bundle;
+
+    return self;
+}
+
+- (void)forwardInvocation:(NSInvocation *)invocation
+{
+    if (self.bundle) {
+        [invocation setTarget:self.bundle];
+        [invocation invoke];
+    }
+}
+
+- (NSMethodSignature *)methodSignatureForSelector:(SEL)sel
+{
+    if ([self.bundle methodSignatureForSelector:sel]) {
+        return [self.bundle methodSignatureForSelector:sel];
+    } else {
+        return [super methodSignatureForSelector:sel];
+    }
+}
+
+- (NSDictionary<NSString *, id> *)infoDictionary {
+    return self.dict;
+}
+
+@end
+
+
+@implementation BSGTestCase
+
+- (void)setUp {
+    if ([super respondsToSelector:@selector(setUp)]) {
+        [super setUp];
+    }
+
+#if TARGET_OS_WATCH
+    static _Atomic(bool) hasSwizzled = false;
+    bool expectedValue = false;
+    if (atomic_compare_exchange_strong(&hasSwizzled, &expectedValue, true)) {
+        BSGWatchKitBundle *bundleProxy = [[BSGWatchKitBundle alloc] initWithBundle:NSBundle.mainBundle];
+        ObjCSwizzle::setClassMethodImplementation(NSBundle.class, @selector(mainBundle), ^NSBundle *{
+            return (NSBundle *)bundleProxy;
+        });
+    }
+
+#endif
+}
+
+@end
diff --git a/Tests/BugsnagTests/BSGUtilsTests.m b/Tests/BugsnagTests/BSGUtilsTests.m
index 70e9d9853..d87da8441 100644
--- a/Tests/BugsnagTests/BSGUtilsTests.m
+++ b/Tests/BugsnagTests/BSGUtilsTests.m
@@ -6,11 +6,11 @@
 //  Copyright © 2021 Bugsnag Inc. All rights reserved.
 //
 
-#import <XCTest/XCTest.h>
+#import "BSGTestCase.h"
 
 #import "BSGUtils.h"
 
-@interface BSGUtilsTests : XCTestCase
+@interface BSGUtilsTests : BSGTestCase
 @end
 
 @implementation BSGUtilsTests
diff --git a/Tests/BugsnagTests/BugsnagApiClientTest.m b/Tests/BugsnagTests/BugsnagApiClientTest.m
index 4abfb2992..dcdfdf391 100644
--- a/Tests/BugsnagTests/BugsnagApiClientTest.m
+++ b/Tests/BugsnagTests/BugsnagApiClientTest.m
@@ -6,13 +6,14 @@
 //  Copyright © 2020 Bugsnag Inc. All rights reserved.
 //
 
-#import <XCTest/XCTest.h>
+#import "BSGTestCase.h"
+
 #import "BugsnagApiClient.h"
 #import <Bugsnag/Bugsnag.h>
 #import "BugsnagTestConstants.h"
 #import "URLSessionMock.h"
 
-@interface BugsnagApiClientTest : XCTestCase
+@interface BugsnagApiClientTest : BSGTestCase
 
 @end
 
diff --git a/Tests/BugsnagTests/BugsnagApiValidationTest.m b/Tests/BugsnagTests/BugsnagApiValidationTest.m
index b204e0c48..0d3dd7a3c 100644
--- a/Tests/BugsnagTests/BugsnagApiValidationTest.m
+++ b/Tests/BugsnagTests/BugsnagApiValidationTest.m
@@ -6,7 +6,8 @@
 //  Copyright © 2020 Bugsnag Inc. All rights reserved.
 //
 
-#import <XCTest/XCTest.h>
+#import "BSGTestCase.h"
+
 #import <Bugsnag/Bugsnag.h>
 #import "BugsnagTestConstants.h"
 #import "TestSupport.h"
@@ -14,13 +15,14 @@
 /**
  * Validates that the Bugsnag API interface handles any invalid input gracefully.
  */
-@interface BugsnagApiValidationTest : XCTestCase
+@interface BugsnagApiValidationTest : BSGTestCase
 
 @end
 
 @implementation BugsnagApiValidationTest
 
 - (void)setUp {
+    [super setUp];
     [TestSupport purgePersistentData];
     [Bugsnag startWithApiKey:DUMMY_APIKEY_32CHAR_1];
 }
diff --git a/Tests/BugsnagTests/BugsnagAppTest.m b/Tests/BugsnagTests/BugsnagAppTest.m
index 94f1a19a7..092c85bdf 100644
--- a/Tests/BugsnagTests/BugsnagAppTest.m
+++ b/Tests/BugsnagTests/BugsnagAppTest.m
@@ -6,7 +6,7 @@
 //  Copyright © 2020 Bugsnag. All rights reserved.
 //
 
-#import <XCTest/XCTest.h>
+#import "BSGTestCase.h"
 
 #import "BSG_KSSystemInfo.h"
 #import "BugsnagApp+Private.h"
@@ -16,7 +16,7 @@
 
 #include <sys/sysctl.h>
 
-@interface BugsnagAppTest : XCTestCase
+@interface BugsnagAppTest : BSGTestCase
 @property NSDictionary *data;
 @property BugsnagConfiguration *config;
 @property NSString *codeBundleId;
diff --git a/Tests/BugsnagTests/BugsnagBreadcrumbsTest.m b/Tests/BugsnagTests/BugsnagBreadcrumbsTest.m
index 465269d06..26edd15d2 100644
--- a/Tests/BugsnagTests/BugsnagBreadcrumbsTest.m
+++ b/Tests/BugsnagTests/BugsnagBreadcrumbsTest.m
@@ -6,6 +6,8 @@
 //
 //
 
+#import "BSGTestCase.h"
+
 #import "BSGUtils.h"
 #import "BSG_KSJSONCodec.h"
 #import "Bugsnag.h"
@@ -15,7 +17,6 @@
 #import "BugsnagTestConstants.h"
 #import "BSGDefines.h"
 
-#import <XCTest/XCTest.h>
 #import <mach/mach_init.h>
 #import <mach/thread_act.h>
 #import <pthread.h>
@@ -61,7 +62,7 @@ static id JSONObject(void (^ block)(BSG_KSCrashReportWriter *writer)) {
     });
 }
 
-@interface BugsnagBreadcrumbsTest : XCTestCase
+@interface BugsnagBreadcrumbsTest : BSGTestCase
 @property(nonatomic, strong) BugsnagBreadcrumbs *crumbs;
 @end
 
diff --git a/Tests/BugsnagTests/BugsnagClientMirrorTest.m b/Tests/BugsnagTests/BugsnagClientMirrorTest.m
index e31ff1a27..3a5d9acb9 100644
--- a/Tests/BugsnagTests/BugsnagClientMirrorTest.m
+++ b/Tests/BugsnagTests/BugsnagClientMirrorTest.m
@@ -6,11 +6,12 @@
 //  Copyright © 2020 Bugsnag. All rights reserved.
 //
 
-#import <XCTest/XCTest.h>
+#import "BSGTestCase.h"
+
 #import <objc/runtime.h>
 #import <Bugsnag/Bugsnag.h>
 
-@interface BugsnagClientMirrorTest : XCTestCase
+@interface BugsnagClientMirrorTest : BSGTestCase
 @property NSSet *clientMethodsNotRequiredOnBugsnag;
 @property NSSet *bugsnagMethodsNotRequiredOnClient;
 @end
@@ -26,6 +27,7 @@ @interface BugsnagClientMirrorTest : XCTestCase
 @implementation BugsnagClientMirrorTest
 
 - (void)setUp {
+    [super setUp];
     // the following methods are implemented on BugsnagClient but do not need to
     // be mirrored on the Bugsnag facade
     self.clientMethodsNotRequiredOnBugsnag = [NSSet setWithArray:@[
diff --git a/Tests/BugsnagTests/BugsnagClientPayloadInfoTest.m b/Tests/BugsnagTests/BugsnagClientPayloadInfoTest.m
index 31cca1552..fe60f3a31 100755
--- a/Tests/BugsnagTests/BugsnagClientPayloadInfoTest.m
+++ b/Tests/BugsnagTests/BugsnagClientPayloadInfoTest.m
@@ -6,20 +6,21 @@
 //  Copyright © 2020 Bugsnag. All rights reserved.
 //
 
-#import <XCTest/XCTest.h>
+#import "BSGTestCase.h"
 
 #import "BugsnagAppWithState+Private.h"
 #import "BugsnagConfiguration.h"
 #import "BugsnagDeviceWithState+Private.h"
 #import "BugsnagTestConstants.h"
 
-@interface BugsnagClientPayloadInfoTest : XCTestCase
+@interface BugsnagClientPayloadInfoTest : BSGTestCase
 
 @end
 
 @implementation BugsnagClientPayloadInfoTest
 
 - (void)setUp {
+    [super setUp];
     BugsnagConfiguration *configuration = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1];
     [Bugsnag startWithConfiguration:configuration];
 }
diff --git a/Tests/BugsnagTests/BugsnagClientTests.m b/Tests/BugsnagTests/BugsnagClientTests.m
index 0efbb186c..4dde42d3e 100644
--- a/Tests/BugsnagTests/BugsnagClientTests.m
+++ b/Tests/BugsnagTests/BugsnagClientTests.m
@@ -6,6 +6,8 @@
 //  Copyright © 2020 Bugsnag. All rights reserved.
 //
 
+#import "BSGTestCase.h"
+
 #import "BSGInternalErrorReporter.h"
 #import "BSGKeys.h"
 #import "BSGRunContext.h"
@@ -19,7 +21,6 @@
 #import "BugsnagUser.h"
 
 #import <objc/runtime.h>
-#import <XCTest/XCTest.h>
 
 /**
  * Tests for BugsnagClient.
@@ -31,7 +32,7 @@
  *
  * For these reasons, test cases should only be added here as a matter of last resort.
  */
-@interface BugsnagClientTests : XCTestCase
+@interface BugsnagClientTests : BSGTestCase
 @end
 
 NSString *BSGFormatSeverity(BSGSeverity severity);
diff --git a/Tests/BugsnagTests/BugsnagCollectionsTests.m b/Tests/BugsnagTests/BugsnagCollectionsTests.m
index b376fb0cd..3d816573f 100644
--- a/Tests/BugsnagTests/BugsnagCollectionsTests.m
+++ b/Tests/BugsnagTests/BugsnagCollectionsTests.m
@@ -6,10 +6,11 @@
 //  Copyright © 2019 Bugsnag. All rights reserved.
 //
 
-@import XCTest;
+#import "BSGTestCase.h"
+
 #import "BugsnagCollections.h"
 
-@interface BugsnagCollectionsTests : XCTestCase
+@interface BugsnagCollectionsTests : BSGTestCase
 @end
 
 @interface BugsnagCollectionsTests_DummyObject : NSObject
diff --git a/Tests/BugsnagTests/BugsnagConfigurationTests.m b/Tests/BugsnagTests/BugsnagConfigurationTests.m
index bbff7fe76..b21702bc9 100644
--- a/Tests/BugsnagTests/BugsnagConfigurationTests.m
+++ b/Tests/BugsnagTests/BugsnagConfigurationTests.m
@@ -2,7 +2,7 @@
  * Unit test the BugsnagConfiguration class
  */
 
-#import <XCTest/XCTest.h>
+#import "BSGTestCase.h"
 
 #import "BugsnagConfiguration+Private.h"
 
@@ -19,7 +19,7 @@
 // MARK: - Tests
 // =============================================================================
 
-@interface BugsnagConfigurationTests : XCTestCase
+@interface BugsnagConfigurationTests : BSGTestCase
 @end
 
 @implementation BugsnagConfigurationTests
diff --git a/Tests/BugsnagTests/BugsnagDeviceTest.m b/Tests/BugsnagTests/BugsnagDeviceTest.m
index d66039f94..f0bfd6e5e 100644
--- a/Tests/BugsnagTests/BugsnagDeviceTest.m
+++ b/Tests/BugsnagTests/BugsnagDeviceTest.m
@@ -6,13 +6,13 @@
 //  Copyright © 2020 Bugsnag. All rights reserved.
 //
 
-#import <XCTest/XCTest.h>
+#import "BSGTestCase.h"
 
 #import "BSG_KSSystemInfo.h"
 #import "BugsnagDevice+Private.h"
 #import "BugsnagDeviceWithState+Private.h"
 
-@interface BugsnagDeviceTest : XCTestCase
+@interface BugsnagDeviceTest : BSGTestCase
 @property NSDictionary *data;
 @end
 
diff --git a/Tests/BugsnagTests/BugsnagEnabledBreadcrumbTest.m b/Tests/BugsnagTests/BugsnagEnabledBreadcrumbTest.m
index 06f33e8b9..7af6a20b9 100644
--- a/Tests/BugsnagTests/BugsnagEnabledBreadcrumbTest.m
+++ b/Tests/BugsnagTests/BugsnagEnabledBreadcrumbTest.m
@@ -6,12 +6,12 @@
 //  Copyright © 2020 Bugsnag. All rights reserved.
 //
 
-#import <XCTest/XCTest.h>
+#import "BSGTestCase.h"
 
 #import "BugsnagConfiguration+Private.h"
 #import "BugsnagTestConstants.h"
 
-@interface BugsnagEnabledBreadcrumbTest : XCTestCase
+@interface BugsnagEnabledBreadcrumbTest : BSGTestCase
 
 @end
 
diff --git a/Tests/BugsnagTests/BugsnagErrorTest.m b/Tests/BugsnagTests/BugsnagErrorTest.m
index 1662f9685..8838cf3cc 100644
--- a/Tests/BugsnagTests/BugsnagErrorTest.m
+++ b/Tests/BugsnagTests/BugsnagErrorTest.m
@@ -6,7 +6,7 @@
 //  Copyright © 2020 Bugsnag. All rights reserved.
 //
 
-#import <XCTest/XCTest.h>
+#import "BSGTestCase.h"
 
 #import "BSGKeys.h"
 #import "BugsnagError+Private.h"
@@ -17,13 +17,14 @@
 
 NSString *BSGParseErrorMessage(NSDictionary *report, NSDictionary *error, NSString *errorType);
 
-@interface BugsnagErrorTest : XCTestCase
+@interface BugsnagErrorTest : BSGTestCase
 @property NSDictionary *event;
 @end
 
 @implementation BugsnagErrorTest
 
 - (void)setUp {
+    [super setUp];
     NSDictionary *thread = @{
             @"current_thread": @YES,
             @"crashed": @YES,
diff --git a/Tests/BugsnagTests/BugsnagEventFromKSCrashReportTest.m b/Tests/BugsnagTests/BugsnagEventFromKSCrashReportTest.m
index eb89ec446..b704af6d2 100644
--- a/Tests/BugsnagTests/BugsnagEventFromKSCrashReportTest.m
+++ b/Tests/BugsnagTests/BugsnagEventFromKSCrashReportTest.m
@@ -6,12 +6,12 @@
 //  Copyright © 2019 Bugsnag. All rights reserved.
 //
 
-@import XCTest;
+#import "BSGTestCase.h"
 
 #import "Bugsnag+Private.h"
 #import "BugsnagEvent+Private.h"
 
-@interface BugsnagEventFromKSCrashReportTest : XCTestCase
+@interface BugsnagEventFromKSCrashReportTest : BSGTestCase
 @property BugsnagEvent *event;
 @end
 
diff --git a/Tests/BugsnagTests/BugsnagEventPersistLoadTest.m b/Tests/BugsnagTests/BugsnagEventPersistLoadTest.m
index ad199cca8..10d9ef103 100644
--- a/Tests/BugsnagTests/BugsnagEventPersistLoadTest.m
+++ b/Tests/BugsnagTests/BugsnagEventPersistLoadTest.m
@@ -6,7 +6,7 @@
 //  Copyright © 2020 Bugsnag. All rights reserved.
 //
 
-#import <XCTest/XCTest.h>
+#import "BSGTestCase.h"
 
 #import "BugsnagEvent+Private.h"
 #import "BugsnagAppWithState.h"
@@ -22,7 +22,7 @@
 #import "BugsnagStackframe.h"
 #import "BugsnagThread.h"
 
-@interface BugsnagEventPersistLoadTest : XCTestCase
+@interface BugsnagEventPersistLoadTest : BSGTestCase
 @property NSDictionary *eventData;
 @end
 
diff --git a/Tests/BugsnagTests/BugsnagEventTests.m b/Tests/BugsnagTests/BugsnagEventTests.m
index 7766508fd..a1d06753f 100644
--- a/Tests/BugsnagTests/BugsnagEventTests.m
+++ b/Tests/BugsnagTests/BugsnagEventTests.m
@@ -6,8 +6,7 @@
 //
 //
 
-#import <Foundation/Foundation.h>
-#import <XCTest/XCTest.h>
+#import "BSGTestCase.h"
 
 #import "BSG_RFC3339DateTool.h"
 #import "Bugsnag.h"
@@ -22,7 +21,7 @@
 #import "BugsnagTestConstants.h"
 #import "BugsnagTestsDummyClass.h"
 
-@interface BugsnagEventTests : XCTestCase
+@interface BugsnagEventTests : BSGTestCase
 @end
 
 @implementation BugsnagEventTests
diff --git a/Tests/BugsnagTests/BugsnagHandledStateTest.m b/Tests/BugsnagTests/BugsnagHandledStateTest.m
index 0a35ea49c..cf47d6e47 100644
--- a/Tests/BugsnagTests/BugsnagHandledStateTest.m
+++ b/Tests/BugsnagTests/BugsnagHandledStateTest.m
@@ -6,11 +6,12 @@
 //  Copyright © 2017 Bugsnag. All rights reserved.
 //
 
-#import <XCTest/XCTest.h>
+#import "BSGTestCase.h"
+
 #import <Bugsnag/Bugsnag.h>
 #import "BugsnagHandledState.h"
 
-@interface BugsnagHandledStateTest : XCTestCase
+@interface BugsnagHandledStateTest : BSGTestCase
 
 @end
 
diff --git a/Tests/BugsnagTests/BugsnagMetadataRedactionTest.m b/Tests/BugsnagTests/BugsnagMetadataRedactionTest.m
index c0be86955..5b9ce8dbe 100644
--- a/Tests/BugsnagTests/BugsnagMetadataRedactionTest.m
+++ b/Tests/BugsnagTests/BugsnagMetadataRedactionTest.m
@@ -6,12 +6,12 @@
 //  Copyright © 2020 Bugsnag. All rights reserved.
 //
 
-#import <XCTest/XCTest.h>
+#import "BSGTestCase.h"
 
 #import "BugsnagBreadcrumb+Private.h"
 #import "BugsnagEvent+Private.h"
 
-@interface BugsnagMetadataRedactionTest : XCTestCase
+@interface BugsnagMetadataRedactionTest : BSGTestCase
 
 @end
 
diff --git a/Tests/BugsnagTests/BugsnagMetadataTests.m b/Tests/BugsnagTests/BugsnagMetadataTests.m
index 24a121b9a..42b7677ca 100644
--- a/Tests/BugsnagTests/BugsnagMetadataTests.m
+++ b/Tests/BugsnagTests/BugsnagMetadataTests.m
@@ -6,17 +6,18 @@
 //  Copyright © 2020 Bugsnag. All rights reserved.
 //
 
+#import "BSGTestCase.h"
+
 #import "BugsnagMetadata.h"
 #import "BugsnagMetadata+Private.h"
 #import "BSGDefines.h"
 
-#import <XCTest/XCTest.h>
 #import <mach/mach_init.h>
 #import <mach/thread_act.h>
 
 // MARK: - Expose tested-class internals
 
-@interface BugsnagMetadataTests : XCTestCase
+@interface BugsnagMetadataTests : BSGTestCase
 @property BOOL delegateCalled;
 @property BugsnagMetadata *metadata;
 @end
@@ -45,6 +46,7 @@ @implementation BugsnagMetadataTests
 @synthesize metadata;
 
 -(void) setUp {
+    [super setUp];
     metadata = [[BugsnagMetadata alloc] init];
 
     __weak __typeof__(self) weakSelf = self;
diff --git a/Tests/BugsnagTests/BugsnagNotifierTest.m b/Tests/BugsnagTests/BugsnagNotifierTest.m
index a89435ce1..e5dbe6c03 100644
--- a/Tests/BugsnagTests/BugsnagNotifierTest.m
+++ b/Tests/BugsnagTests/BugsnagNotifierTest.m
@@ -6,16 +6,18 @@
 //  Copyright © 2020 Bugsnag. All rights reserved.
 //
 
-#import <XCTest/XCTest.h>
+#import "BSGTestCase.h"
+
 #import "BugsnagNotifier.h"
 
-@interface BugsnagNotifierTest : XCTestCase
+@interface BugsnagNotifierTest : BSGTestCase
 @property BugsnagNotifier *notifier;
 @end
 
 @implementation BugsnagNotifierTest
 
 - (void)setUp {
+    [super setUp];
     self.notifier = [BugsnagNotifier new];
     self.notifier.name = @"Foo Notifier";
     self.notifier.version = @"6.0.0";
diff --git a/Tests/BugsnagTests/BugsnagOnBreadcrumbTest.m b/Tests/BugsnagTests/BugsnagOnBreadcrumbTest.m
index 877d9a2e0..f73d6b765 100644
--- a/Tests/BugsnagTests/BugsnagOnBreadcrumbTest.m
+++ b/Tests/BugsnagTests/BugsnagOnBreadcrumbTest.m
@@ -6,7 +6,7 @@
 //  Copyright © 2020 Bugsnag. All rights reserved.
 //
 
-#import <XCTest/XCTest.h>
+#import "BSGTestCase.h"
 
 #import "Bugsnag.h"
 #import "BugsnagBreadcrumb+Private.h"
@@ -15,7 +15,7 @@
 #import "BugsnagTestConstants.h"
 #import "BugsnagBreadcrumbs.h"
 
-@interface BugsnagOnBreadcrumbTest : XCTestCase
+@interface BugsnagOnBreadcrumbTest : BSGTestCase
 @end
 
 @implementation BugsnagOnBreadcrumbTest
diff --git a/Tests/BugsnagTests/BugsnagOnCrashTest.m b/Tests/BugsnagTests/BugsnagOnCrashTest.m
index 7dd48d8bb..31bdaf35e 100644
--- a/Tests/BugsnagTests/BugsnagOnCrashTest.m
+++ b/Tests/BugsnagTests/BugsnagOnCrashTest.m
@@ -6,12 +6,12 @@
 //  Copyright © 2020 Bugsnag. All rights reserved.
 //
 
-#import <XCTest/XCTest.h>
+#import "BSGTestCase.h"
 
 #import <Bugsnag/Bugsnag.h>
 #import "BugsnagEvent+Private.h"
 
-@interface BugsnagOnCrashTest : XCTestCase
+@interface BugsnagOnCrashTest : BSGTestCase
 
 @end
 
diff --git a/Tests/BugsnagTests/BugsnagPluginTest.m b/Tests/BugsnagTests/BugsnagPluginTest.m
index 3a1393bec..06c89ae51 100644
--- a/Tests/BugsnagTests/BugsnagPluginTest.m
+++ b/Tests/BugsnagTests/BugsnagPluginTest.m
@@ -6,14 +6,14 @@
 //  Copyright © 2020 Bugsnag. All rights reserved.
 //
 
-#import <XCTest/XCTest.h>
+#import "BSGTestCase.h"
 
 #import "BugsnagTestConstants.h"
 #import "Bugsnag.h"
 #import "BugsnagClient+Private.h"
 #import "BugsnagConfiguration+Private.h"
 
-@interface BugsnagPluginTest : XCTestCase
+@interface BugsnagPluginTest : BSGTestCase
 
 @end
 
diff --git a/Tests/BugsnagTests/BugsnagSessionTest.m b/Tests/BugsnagTests/BugsnagSessionTest.m
index a2c48040e..cf4600d63 100644
--- a/Tests/BugsnagTests/BugsnagSessionTest.m
+++ b/Tests/BugsnagTests/BugsnagSessionTest.m
@@ -6,7 +6,7 @@
 //  Copyright © 2017 Bugsnag. All rights reserved.
 //
 
-#import <XCTest/XCTest.h>
+#import "BSGTestCase.h"
 
 #import "BugsnagApp+Private.h"
 #import "BugsnagConfiguration+Private.h"
@@ -16,7 +16,7 @@
 #import "BSG_RFC3339DateTool.h"
 #import "BugsnagTestConstants.h"
 
-@interface BugsnagSessionTest : XCTestCase
+@interface BugsnagSessionTest : BSGTestCase
 @property BugsnagApp *app;
 @property BugsnagDevice *device;
 @property NSDictionary *serializedSession;
@@ -25,6 +25,7 @@ @interface BugsnagSessionTest : XCTestCase
 @implementation BugsnagSessionTest
 
 - (void)setUp {
+    [super setUp];
     self.app = [self generateApp];
     self.device = [self generateDevice];
     self.serializedSession = [self generateSerializedSession];
diff --git a/Tests/BugsnagTests/BugsnagSessionTrackerStopTest.m b/Tests/BugsnagTests/BugsnagSessionTrackerStopTest.m
index 7e1628330..53416fcc7 100644
--- a/Tests/BugsnagTests/BugsnagSessionTrackerStopTest.m
+++ b/Tests/BugsnagTests/BugsnagSessionTrackerStopTest.m
@@ -6,13 +6,13 @@
 //  Copyright © 2019 Bugsnag. All rights reserved.
 //
 
-#import <XCTest/XCTest.h>
+#import "BSGTestCase.h"
 
 #import "BugsnagSession+Private.h"
 #import "BugsnagSessionTracker.h"
 #import "BugsnagTestConstants.h"
 
-@interface BugsnagSessionTrackerStopTest : XCTestCase
+@interface BugsnagSessionTrackerStopTest : BSGTestCase
 @property BugsnagConfiguration *configuration;
 @property BugsnagSessionTracker *tracker;
 @end
diff --git a/Tests/BugsnagTests/BugsnagSessionTrackerTest.m b/Tests/BugsnagTests/BugsnagSessionTrackerTest.m
index 016464429..13bf85853 100644
--- a/Tests/BugsnagTests/BugsnagSessionTrackerTest.m
+++ b/Tests/BugsnagTests/BugsnagSessionTrackerTest.m
@@ -6,7 +6,7 @@
 //  Copyright © 2017 Bugsnag. All rights reserved.
 //
 
-#import <XCTest/XCTest.h>
+#import "BSGTestCase.h"
 
 #import "BugsnagUser.h"
 #import "BugsnagConfiguration+Private.h"
@@ -16,7 +16,7 @@
 #import "BSGDefines.h"
 #import "BSGWatchKit.h"
 
-@interface BugsnagSessionTrackerTest : XCTestCase
+@interface BugsnagSessionTrackerTest : BSGTestCase
 @property BugsnagConfiguration *configuration;
 @property BugsnagSessionTracker *sessionTracker;
 @property BugsnagUser *user;
diff --git a/Tests/BugsnagTests/BugsnagStackframeTest.m b/Tests/BugsnagTests/BugsnagStackframeTest.m
index bb584fd86..d8333fb7d 100644
--- a/Tests/BugsnagTests/BugsnagStackframeTest.m
+++ b/Tests/BugsnagTests/BugsnagStackframeTest.m
@@ -6,12 +6,12 @@
 //  Copyright © 2020 Bugsnag. All rights reserved.
 //
 
-#import <XCTest/XCTest.h>
+#import "BSGTestCase.h"
 
 #import "BSG_KSMachHeaders.h"
 #import "BugsnagStackframe+Private.h"
 
-@interface BugsnagStackframeTest : XCTestCase
+@interface BugsnagStackframeTest : BSGTestCase
 @property NSDictionary *frameDict;
 @property NSArray *binaryImages;
 @end
@@ -19,6 +19,7 @@ @interface BugsnagStackframeTest : XCTestCase
 @implementation BugsnagStackframeTest
 
 - (void)setUp {
+    [super setUp];
     self.frameDict = @{
             @"symbol_addr": @0x10b574fa0,
             @"instruction_addr": @0x10b5756bf,
diff --git a/Tests/BugsnagTests/BugsnagStacktraceTest.m b/Tests/BugsnagTests/BugsnagStacktraceTest.m
index 123184ac8..e11e94611 100644
--- a/Tests/BugsnagTests/BugsnagStacktraceTest.m
+++ b/Tests/BugsnagTests/BugsnagStacktraceTest.m
@@ -6,11 +6,11 @@
 //  Copyright © 2020 Bugsnag. All rights reserved.
 //
 
-#import <XCTest/XCTest.h>
+#import "BSGTestCase.h"
 
 #import "BugsnagStacktrace.h"
 
-@interface BugsnagStacktraceTest : XCTestCase
+@interface BugsnagStacktraceTest : BSGTestCase
 @property NSDictionary *frameDict;
 @property NSArray *binaryImages;
 @end
@@ -18,6 +18,7 @@ @interface BugsnagStacktraceTest : XCTestCase
 @implementation BugsnagStacktraceTest
 
 - (void)setUp {
+    [super setUp];
     self.frameDict = @{
             @"symbol_addr": @0x10b574fa0,
             @"instruction_addr": @0x10b5756bf,
diff --git a/Tests/BugsnagTests/BugsnagSwiftConfigurationTests.swift b/Tests/BugsnagTests/BugsnagSwiftConfigurationTests.swift
index b10f56e4f..fa648f29f 100644
--- a/Tests/BugsnagTests/BugsnagSwiftConfigurationTests.swift
+++ b/Tests/BugsnagTests/BugsnagSwiftConfigurationTests.swift
@@ -6,10 +6,9 @@
 //  Copyright © 2020 Bugsnag. All rights reserved.
 //
 
-import XCTest
 import Bugsnag
 
-class BugsnagSwiftConfigurationTests: XCTestCase {
+class BugsnagSwiftConfigurationTests: BSGTestCase {
 
     /**
      * Objective C trailing-NSError* initializers are translated into throwing
diff --git a/Tests/BugsnagTests/BugsnagSwiftPublicAPITests.swift b/Tests/BugsnagTests/BugsnagSwiftPublicAPITests.swift
index a5b53d9a5..5b4ec5211 100644
--- a/Tests/BugsnagTests/BugsnagSwiftPublicAPITests.swift
+++ b/Tests/BugsnagTests/BugsnagSwiftPublicAPITests.swift
@@ -6,7 +6,7 @@
 //  Copyright © 2020 Bugsnag. All rights reserved.
 //
 
-import XCTest
+import Bugsnag
 
 /**
  * Test all public APIs from Swift.  Purely existence tests, no attempt to verify correctness
@@ -34,7 +34,7 @@ class myMetadata: NSObject, BugsnagMetadataStore, BugsnagClassLevelMetadataStore
     func clearMetadata(section sectionName: String, key: String) {}
 }
 
-class BugsnagSwiftPublicAPITests: XCTestCase {
+class BugsnagSwiftPublicAPITests: BSGTestCase {
 
     let apiKey = "01234567890123456789012345678901"
     let ex = NSException(name: NSExceptionName("exception"),
diff --git a/Tests/BugsnagTests/BugsnagSwiftTests.swift b/Tests/BugsnagTests/BugsnagSwiftTests.swift
index a30eab783..2e0511c63 100644
--- a/Tests/BugsnagTests/BugsnagSwiftTests.swift
+++ b/Tests/BugsnagTests/BugsnagSwiftTests.swift
@@ -7,9 +7,9 @@
 //
 //  Swift unit tests of global Bugsnag behaviour
 
-import XCTest
+import Bugsnag
 
-class BugsnagSwiftTests: XCTestCase {
+class BugsnagSwiftTests: BSGTestCase {
 
     /**
      * Confirm that the addMetadata() method is exposed to Swift correctly
diff --git a/Tests/BugsnagTests/BugsnagTests.m b/Tests/BugsnagTests/BugsnagTests.m
index 268f76665..da803d83b 100644
--- a/Tests/BugsnagTests/BugsnagTests.m
+++ b/Tests/BugsnagTests/BugsnagTests.m
@@ -7,7 +7,7 @@
 //
 // Unit tests of global Bugsnag behaviour
 
-#import <XCTest/XCTest.h>
+#import "BSGTestCase.h"
 
 #import "Bugsnag.h"
 #import "BugsnagClient+Private.h"
@@ -18,7 +18,7 @@
 
 // MARK: - BugsnagTests
 
-@interface BugsnagTests : XCTestCase
+@interface BugsnagTests : BSGTestCase
 @end
 
 @implementation BugsnagTests
diff --git a/Tests/BugsnagTests/BugsnagThreadSerializationTest.m b/Tests/BugsnagTests/BugsnagThreadSerializationTest.m
index 0a41b0c29..98e41a76e 100644
--- a/Tests/BugsnagTests/BugsnagThreadSerializationTest.m
+++ b/Tests/BugsnagTests/BugsnagThreadSerializationTest.m
@@ -3,11 +3,11 @@
 // Copyright (c) 2018 Bugsnag. All rights reserved.
 //
 
-#import <XCTest/XCTest.h>
+#import "BSGTestCase.h"
 
 #import "BugsnagEvent+Private.h"
 
-@interface BugsnagThreadSerializationTest : XCTestCase
+@interface BugsnagThreadSerializationTest : BSGTestCase
 @end
 
 @implementation BugsnagThreadSerializationTest
diff --git a/Tests/BugsnagTests/BugsnagThreadTests.m b/Tests/BugsnagTests/BugsnagThreadTests.m
index 6f664aa1f..75d9305e2 100644
--- a/Tests/BugsnagTests/BugsnagThreadTests.m
+++ b/Tests/BugsnagTests/BugsnagThreadTests.m
@@ -6,7 +6,7 @@
 //  Copyright © 2020 Bugsnag. All rights reserved.
 //
 
-#import <XCTest/XCTest.h>
+#import "BSGTestCase.h"
 
 #import "BSG_KSMachHeaders.h"
 #import "BugsnagStackframe+Private.h"
@@ -15,7 +15,7 @@
 #import <pthread.h>
 #import <stdatomic.h>
 
-@interface BugsnagThreadTests : XCTestCase
+@interface BugsnagThreadTests : BSGTestCase
 @property NSArray *binaryImages;
 @property NSDictionary *thread;
 @end
@@ -23,11 +23,13 @@ @interface BugsnagThreadTests : XCTestCase
 @implementation BugsnagThreadTests
 
 + (void)setUp {
+    [super setUp];
     bsg_mach_headers_initialize();
     bsg_mach_headers_get_images(); // Ensure call stack can be symbolicated
 }
 
 - (void)setUp {
+    [super setUp];
     self.thread = @{
             @"current_thread": @YES,
             @"crashed": @YES,
diff --git a/Tests/BugsnagTests/BugsnagUserTest.m b/Tests/BugsnagTests/BugsnagUserTest.m
index c834b89e3..b74779ed5 100644
--- a/Tests/BugsnagTests/BugsnagUserTest.m
+++ b/Tests/BugsnagTests/BugsnagUserTest.m
@@ -6,12 +6,12 @@
 //  Copyright © 2017 Bugsnag. All rights reserved.
 //
 
-#import <XCTest/XCTest.h>
+#import "BSGTestCase.h"
 
 #import "BugsnagEvent+Private.h"
 #import "BugsnagUser+Private.h"
 
-@interface BugsnagUserTest : XCTestCase
+@interface BugsnagUserTest : BSGTestCase
 @end
 
 @implementation BugsnagUserTest
diff --git a/Tests/BugsnagTests/ClientApiValidationTest.m b/Tests/BugsnagTests/ClientApiValidationTest.m
index 75a5c3bca..b24edd3ae 100644
--- a/Tests/BugsnagTests/ClientApiValidationTest.m
+++ b/Tests/BugsnagTests/ClientApiValidationTest.m
@@ -6,20 +6,22 @@
 //  Copyright © 2020 Bugsnag Inc. All rights reserved.
 //
 
-#import <XCTest/XCTest.h>
+#import "BSGTestCase.h"
+
 #import <Bugsnag/Bugsnag.h>
 #import "BugsnagTestConstants.h"
 
 /**
 * Validates that the Client API interface handles any invalid input gracefully.
 */
-@interface ClientApiValidationTest : XCTestCase
+@interface ClientApiValidationTest : BSGTestCase
 @property BugsnagClient *client;
 @end
 
 @implementation ClientApiValidationTest
 
 - (void)setUp {
+    [super setUp];
     BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1];
     [config addOnSendErrorBlock:^BOOL(BugsnagEvent *event) {
         return NO;
diff --git a/Tests/BugsnagTests/ConfigurationApiValidationTest.m b/Tests/BugsnagTests/ConfigurationApiValidationTest.m
index 2c4c0fb8b..3cb8a1101 100644
--- a/Tests/BugsnagTests/ConfigurationApiValidationTest.m
+++ b/Tests/BugsnagTests/ConfigurationApiValidationTest.m
@@ -6,7 +6,8 @@
 //  Copyright © 2020 Bugsnag Inc. All rights reserved.
 //
 
-#import <XCTest/XCTest.h>
+#import "BSGTestCase.h"
+
 #import <Bugsnag/Bugsnag.h>
 #import "BugsnagConfiguration+Private.h"
 #import "BugsnagPlugin.h"
@@ -23,13 +24,14 @@ - (void)unload {}
 /**
 * Validates that the Configuration API interface handles any invalid input gracefully.
 */
-@interface ConfigurationApiValidationTest : XCTestCase
+@interface ConfigurationApiValidationTest : BSGTestCase
 @property BugsnagConfiguration *config;
 @end
 
 @implementation ConfigurationApiValidationTest
 
 - (void)setUp {
+    [super setUp];
     self.config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1];
 }
 
diff --git a/Tests/BugsnagTests/EventApiValidationTest.m b/Tests/BugsnagTests/EventApiValidationTest.m
index 164093a9a..5e964756f 100644
--- a/Tests/BugsnagTests/EventApiValidationTest.m
+++ b/Tests/BugsnagTests/EventApiValidationTest.m
@@ -6,7 +6,7 @@
 //  Copyright © 2020 Bugsnag Inc. All rights reserved.
 //
 
-#import <XCTest/XCTest.h>
+#import "BSGTestCase.h"
 
 #import <Bugsnag/Bugsnag.h>
 #import "BugsnagEvent+Private.h"
@@ -14,13 +14,14 @@
 /**
 * Validates that the Event API interface handles any invalid input gracefully.
 */
-@interface EventApiValidationTest : XCTestCase
+@interface EventApiValidationTest : BSGTestCase
 @property BugsnagEvent *event;
 @end
 
 @implementation EventApiValidationTest
 
 - (void)setUp {
+    [super setUp];
     self.event = [[BugsnagEvent alloc] initWithKSReport:@{@"user": @{}}];
 }
 
diff --git a/Tests/BugsnagTests/FileBasedTest.h b/Tests/BugsnagTests/FileBasedTest.h
index 70e231638..270e78fd6 100644
--- a/Tests/BugsnagTests/FileBasedTest.h
+++ b/Tests/BugsnagTests/FileBasedTest.h
@@ -6,9 +6,9 @@
 //  Copyright © 2023 Bugsnag. All rights reserved.
 //
 
-#import <XCTest/XCTest.h>
+#import "BSGTestCase.h"
 
-@interface FileBasedTest : XCTestCase
+@interface FileBasedTest : BSGTestCase
 
 @property(readwrite, nonatomic) NSString *filePath;
 
diff --git a/Tests/BugsnagTests/FileBasedTest.m b/Tests/BugsnagTests/FileBasedTest.m
index 219550380..849f11ab0 100644
--- a/Tests/BugsnagTests/FileBasedTest.m
+++ b/Tests/BugsnagTests/FileBasedTest.m
@@ -15,6 +15,7 @@ - (NSString *)newPath {
 }
 
 - (void)setUp {
+    [super setUp];
     self.filePath = [self newPath];
 }
 
diff --git a/Tests/BugsnagTests/Swizzle.h b/Tests/BugsnagTests/Swizzle.h
new file mode 100644
index 000000000..68c22611f
--- /dev/null
+++ b/Tests/BugsnagTests/Swizzle.h
@@ -0,0 +1,36 @@
+//
+//  Swizzle.h
+//  Bugsnag
+//
+//  Created by Karl Stenerud on 21.04.23.
+//  Copyright © 2023 Bugsnag. All rights reserved.
+//
+
+#pragma once
+
+#import <Foundation/Foundation.h>
+
+namespace bugsnag {
+
+class ObjCSwizzle {
+public:
+    /**
+     * Replace a class's current method implementation with a new implementation block, returning the replaced one.
+     * Returns nil if the method was not found (in the class or any superclass).
+     */
+    static IMP _Nullable setClassMethodImplementation(Class _Nonnull clazz, SEL _Nonnull selector, id _Nonnull implementationBlock) noexcept;
+
+    /**
+     * Replace a class's override of a method (i.e. only if this class overrides the method). No superclass implementation is replaced.
+     * Returns nil if no method was replaced (either method not found, or this class doesn't overrde the method).
+     */
+    static IMP _Nullable replaceInstanceMethodOverride(Class _Nonnull cls, SEL _Nonnull name, id _Nonnull block) noexcept;
+
+    /**
+     * Get any classes or superclasses that implement the specified selector.
+     */
+    static NSArray<Class> * _Nonnull getClassesWithSelector(Class _Nullable cls, SEL _Nonnull selector) noexcept;
+
+};
+
+}
diff --git a/Tests/BugsnagTests/Swizzle.mm b/Tests/BugsnagTests/Swizzle.mm
new file mode 100644
index 000000000..abc784471
--- /dev/null
+++ b/Tests/BugsnagTests/Swizzle.mm
@@ -0,0 +1,68 @@
+//
+//  Swizzle.mm
+//  Bugsnag
+//
+//  Created by Karl Stenerud on 21.04.23.
+//  Copyright © 2023 Bugsnag. All rights reserved.
+//
+
+#import "Swizzle.h"
+#import <objc/runtime.h>
+
+namespace bugsnag {
+
+IMP ObjCSwizzle::setClassMethodImplementation(Class _Nonnull clazz, SEL selector, id _Nonnull implementationBlock) noexcept {
+    Method method = class_getClassMethod(clazz, selector);
+    if (method) {
+        return method_setImplementation(method, imp_implementationWithBlock(implementationBlock));
+    } else {
+        NSLog(@"Could not set IMP for selector %s on class %@", sel_getName(selector), clazz);
+        return nil;
+    }
+}
+
+IMP ObjCSwizzle::replaceInstanceMethodOverride(Class clazz, SEL selector, id block) noexcept {
+    Method method = nullptr;
+
+    // Not using class_getInstanceMethod because we don't want to modify the
+    // superclass's implementation.
+    auto methodCount = 0U;
+    Method *methods = class_copyMethodList(clazz, &methodCount);
+    if (methods) {
+        for (auto i = 0U; i < methodCount; i++) {
+            if (sel_isEqual(method_getName(methods[i]), selector)) {
+                method = methods[i];
+                break;
+            }
+        }
+        free(methods);
+    }
+
+    if (!method) {
+        // This is not considered an error.
+        return nil;
+    }
+
+    return method_setImplementation(method, imp_implementationWithBlock(block));
+}
+
+NSArray<Class> *ObjCSwizzle::getClassesWithSelector(Class cls, SEL selector) noexcept {
+    NSMutableArray<Class> *result = [NSMutableArray new];
+    for (; class_getInstanceMethod(cls, selector); cls = [cls superclass]) {
+        if (!cls) {
+            break;
+        }
+        Class superCls = [cls superclass];
+        Method classMethod = class_getInstanceMethod(cls, selector);
+        Method superMethod = class_getInstanceMethod(superCls, selector);
+        IMP classIMP = classMethod ? method_getImplementation(classMethod) : nil;
+        IMP superIMP = superMethod ? method_getImplementation(superMethod) : nil;
+        if (classIMP != superIMP) {
+            [result addObject:(Class _Nonnull)cls];
+        }
+    }
+    return result;
+};
+
+
+}
diff --git a/Tests/BugsnagTests/Tests-Bridging-Header.h b/Tests/BugsnagTests/Tests-Bridging-Header.h
index c54081022..3603229d8 100644
--- a/Tests/BugsnagTests/Tests-Bridging-Header.h
+++ b/Tests/BugsnagTests/Tests-Bridging-Header.h
@@ -5,3 +5,4 @@
 #import <Bugsnag/Bugsnag.h>
 
 #import "BugsnagTestConstants.h"
+#import "BSGTestCase.h"
diff --git a/Tests/KSCrashTests/BSG_KSFileTests.m b/Tests/KSCrashTests/BSG_KSFileTests.m
index 622563519..f4ad55f71 100644
--- a/Tests/KSCrashTests/BSG_KSFileTests.m
+++ b/Tests/KSCrashTests/BSG_KSFileTests.m
@@ -20,6 +20,7 @@ @interface BSG_KSFileTests : XCTestCase
 @implementation BSG_KSFileTests
 
 - (void)setUp {
+    [super setUp];
     self.filePath = [NSTemporaryDirectory() stringByAppendingPathComponent:[self description]];
     self.fileDescriptor = open(self.filePath.fileSystemRepresentation, O_RDWR | O_CREAT | O_EXCL, 0644);
 }
diff --git a/Tests/KSCrashTests/BSG_KSMachHeadersTests.m b/Tests/KSCrashTests/BSG_KSMachHeadersTests.m
index 3d5370417..a41c082bd 100644
--- a/Tests/KSCrashTests/BSG_KSMachHeadersTests.m
+++ b/Tests/KSCrashTests/BSG_KSMachHeadersTests.m
@@ -53,6 +53,7 @@ @interface BSG_KSMachHeadersTests : XCTestCase
 @implementation BSG_KSMachHeadersTests
 
 - (void)setUp {
+    [super setUp];
     bsg_mach_headers_initialize();
 }
 
diff --git a/Tests/KSCrashTests/KSCrashNames_Test.m b/Tests/KSCrashTests/KSCrashNames_Test.m
index 01f1f17f2..77947e9fc 100644
--- a/Tests/KSCrashTests/KSCrashNames_Test.m
+++ b/Tests/KSCrashTests/KSCrashNames_Test.m
@@ -16,14 +16,6 @@ @interface KSCrashNames_Test : XCTestCase
 
 @implementation KSCrashNames_Test
 
-- (void)setUp {
-    // Put setup code here. This method is called before the invocation of each test method in the class.
-}
-
-- (void)tearDown {
-    // Put teardown code here. This method is called after the invocation of each test method in the class.
-}
-
 - (void)testValidStates {
     XCTAssertTrue(strcmp(bsg_kscrashthread_state_name(TH_STATE_RUNNING), "TH_STATE_RUNNING") == 0);
     XCTAssertTrue(strcmp(bsg_kscrashthread_state_name(TH_STATE_STOPPED), "TH_STATE_STOPPED") == 0);
diff --git a/Tests/KSCrashTests/KSCrashSentry_Tests.m b/Tests/KSCrashTests/KSCrashSentry_Tests.m
index c744d2370..4f6fa5365 100755
--- a/Tests/KSCrashTests/KSCrashSentry_Tests.m
+++ b/Tests/KSCrashTests/KSCrashSentry_Tests.m
@@ -44,6 +44,7 @@ @interface KSCrashSentry_Tests : XCTestCase @end
 @implementation KSCrashSentry_Tests
 
 - (void) setUp {
+    [super setUp];
     bsg_kscrashsentry_installWithContext(&context, BSG_KSCrashTypeAll, onCrash);
 }