Add return Task.CompletedTask to exception test methods

Fixed compilation errors where Task methods were not returning a value.
All exception test methods now properly return Task.CompletedTask.

Co-authored-by: JohnCampionJr <1094820+JohnCampionJr@users.noreply.github.com>

Author: Copilot

tests/MongoFramework.AspNetCore.Identity.Tests/MongoUserOnlyStoreTests/AddClaims.cs

@@ -83,6 +83,7 @@ public Task ThrowsExceptionWithNullArguments()
                 var _ = store.AddClaimsAsync(user, null);
             };
             act1.Should().Throw<ArgumentNullException>();
+            return Task.CompletedTask;
         }
 
     }

tests/MongoFramework.AspNetCore.Identity.Tests/MongoUserOnlyStoreTests/AddLogin.cs

@@ -74,6 +74,7 @@ public Task ThrowsExceptionWithNullArguments()
                 var _ = store.AddLoginAsync(user, null);
             };
             act1.Should().Throw<ArgumentNullException>();
+            return Task.CompletedTask;
         }
 
     }

tests/MongoFramework.AspNetCore.Identity.Tests/MongoUserOnlyStoreTests/CreateUser.cs

@@ -88,6 +88,7 @@ public Task ThrowsExceptionWithNull()
                 var _ = store.CreateAsync(null);
             };
             act.Should().Throw<ArgumentNullException>();
+            return Task.CompletedTask;
         }
 
     }

tests/MongoFramework.AspNetCore.Identity.Tests/MongoUserOnlyStoreTests/DeleteUser.cs

@@ -61,6 +61,7 @@ public Task ThrowsExceptionWithNull()
                 var _ = store.DeleteAsync(null);
             };
             act.Should().Throw<ArgumentNullException>();
+            return Task.CompletedTask;
         }
 
     }

tests/MongoFramework.AspNetCore.Identity.Tests/MongoUserOnlyStoreTests/FindById.cs

@@ -87,6 +87,7 @@ public Task ThrowsExceptionWithNull()
                 var _ = store.FindByIdAsync(null);
             };
             act.Should().Throw<ArgumentNullException>();
+            return Task.CompletedTask;
         }
 
     }

tests/MongoFramework.AspNetCore.Identity.Tests/MongoUserOnlyStoreTests/FindByName.cs

@@ -75,6 +75,7 @@ public Task ThrowsExceptionWithNull()
                 var _ = store.FindByNameAsync(null);
             };
             act.Should().Throw<ArgumentNullException>();
+            return Task.CompletedTask;
         }
 
     }

tests/MongoFramework.AspNetCore.Identity.Tests/MongoUserOnlyStoreTests/GetClaims.cs

@@ -57,6 +57,7 @@ public Task ThrowsExceptionWithNullArguments()
                 var _ = store.GetClaimsAsync(null);
             };
             act.Should().Throw<ArgumentNullException>();
+            return Task.CompletedTask;
         }
 
     }

tests/MongoFramework.AspNetCore.Identity.Tests/MongoUserOnlyStoreTests/GetLogins.cs

@@ -53,6 +53,7 @@ public Task ThrowsExceptionWithNullArguments()
                 var _ = store.GetLoginsAsync(null);
             };
             act.Should().Throw<ArgumentNullException>();
+            return Task.CompletedTask;
         }
 
     }

tests/MongoFramework.AspNetCore.Identity.Tests/MongoUserOnlyStoreTests/GetToken.cs

@@ -54,6 +54,7 @@ public Task ThrowsExceptionWithNullArguments()
                 var _ = store.GetTokenAsync(null, "", "", default);
             };
             act.Should().Throw<ArgumentNullException>();
+            return Task.CompletedTask;
         }
 
     }

tests/MongoFramework.AspNetCore.Identity.Tests/MongoUserOnlyStoreTests/GetUsersForClaim.cs

@@ -76,6 +76,7 @@ public Task ThrowsExceptionWithNullArguments()
                 var _ = store.GetClaimsAsync(null);
             };
             act.Should().Throw<ArgumentNullException>();
+            return Task.CompletedTask;
         }
 
     }