diff --git a/smithy-typescript-codegen-test/model/main.smithy b/smithy-typescript-codegen-test/model/main.smithy
index 3709d45609f..7f8b5df032e 100644
--- a/smithy-typescript-codegen-test/model/main.smithy
+++ b/smithy-typescript-codegen-test/model/main.smithy
@@ -13,7 +13,7 @@ use smithy.waiters#waitable
 //   auth scheme support is implemented
 // @httpApiKeyAuth(name: "X-Api-Key", in: "header")
 // @httpBearerAuth
-// @sigv4(name: "weather")
+@sigv4(name: "weather")
 // @auth([sigv4])
 @paginated(inputToken: "nextToken", outputToken: "nextToken", pageSize: "pageSize")
 service Weather {
@@ -28,10 +28,12 @@ service Weather {
         // experimentalIdentityAndAuth
         // OnlyHttpApiKeyAuth
         // OnlyHttpBearerAuth
+        OnlySigv4Auth
         // OnlyHttpApiKeyAndBearerAuth
         // OnlyHttpApiKeyAndBearerAuthReversed
         // OnlyHttpApiKeyAuthOptional
-        // SameAsService
+        OnlySigv4AuthOptional
+        SameAsService
     ]
 }
 
@@ -43,6 +45,10 @@ operation OnlyHttpApiKeyAuth {}
 @auth([httpBearerAuth])
 operation OnlyHttpBearerAuth {}
 
+@http(method: "GET", uri: "/OnlySigv4Auth")
+@auth([sigv4])
+operation OnlySigv4Auth {}
+
 @http(method: "GET", uri: "/OnlyHttpApiKeyAndBearerAuth")
 @auth([httpApiKeyAuth, httpBearerAuth])
 operation OnlyHttpApiKeyAndBearerAuth {}
@@ -56,6 +62,11 @@ operation OnlyHttpApiKeyAndBearerAuthReversed {}
 @optionalAuth
 operation OnlyHttpApiKeyAuthOptional {}
 
+@http(method: "GET", uri: "/OnlySigv4AuthOptional")
+@auth([sigv4])
+@optionalAuth
+operation OnlySigv4AuthOptional {}
+
 @http(method: "GET", uri: "/SameAsService")
 operation SameAsService {}