Prevent ServiceControllerTests from dispose when already disposed

src/System.ServiceProcess.ServiceController/tests/ServiceBaseTests.cs

@@ -21,6 +21,8 @@ public class ServiceBaseTests : IDisposable
         private static readonly Lazy<bool> s_isElevated = new Lazy<bool>(() => AdminHelpers.IsProcessElevated());
         protected static bool IsProcessElevated => s_isElevated.Value;
 
+        private bool _disposed;
+
         public ServiceBaseTests()
         {
             _testService = new TestServiceProvider();
@@ -174,7 +176,11 @@ public void TestOnContinueBeforePause()
 
         public void Dispose()
         {
-            _testService.DeleteTestServices();
+            if (!_disposed)
+            {
+                _testService.DeleteTestServices();
+                _disposed = true;
+            }
         }
     }
 }

src/System.ServiceProcess.ServiceController/tests/ServiceControllerTests.cs

@@ -19,6 +19,7 @@ public class ServiceControllerTests : IDisposable
         protected static bool IsProcessElevated => s_isElevated.Value;
 
         private const int ExpectedDependentServiceCount = 3;
+        private bool _disposed;
 
         public ServiceControllerTests()
         {
@@ -190,7 +191,11 @@ public void ServicesStartMode()
 
         public void Dispose()
         {
-            _testService.DeleteTestServices();
+            if (!_disposed)
+            {
+                _testService.DeleteTestServices();
+                _disposed = true;
+            }
         }
 
         private static ServiceController AssertHasDependent(ServiceController controller, string serviceName, string displayName)

src/System.ServiceProcess.ServiceController/tests/System.ServiceProcess.ServiceController.TestService/TestServiceInstaller.cs

@@ -14,6 +14,8 @@ public class TestServiceInstaller
     {
         public const string LocalServiceName = "NT AUTHORITY\\LocalService";
 
+        private string _removalStack;
+
         public TestServiceInstaller()
         {
         }
@@ -128,6 +130,19 @@ public unsafe void Install()
 
         public void RemoveService()
         {
+            if (ServiceName == null)
+                throw new InvalidOperationException($"Already removed service at stack ${_removalStack}");
+
+            // Store the stack for logging in case we're called twice
+            try
+            {
+                throw new Exception();
+            }
+            catch (Exception e)
+            {
+                _removalStack = e.StackTrace;
+            }
+
             // Stop the service
             using (ServiceController svc = new ServiceController(ServiceName))
             {
@@ -161,6 +176,8 @@ public void RemoveService()
 
                 Interop.Advapi32.CloseServiceHandle(serviceManagerHandle);
             }
+
+            ServiceName = null;
         }
     }
-}
+}