diff --git a/internal/workflow_testsuite.go b/internal/workflow_testsuite.go
index ccda380a7..9985fdd58 100644
--- a/internal/workflow_testsuite.go
+++ b/internal/workflow_testsuite.go
@@ -89,9 +89,9 @@ type (
 	// Tests are welcome to implement their own version of this interface if they need to test more complex
 	// update logic. This is a simple implementation to make testing basic Workflow Updates easier.
 	TestUpdateCallback struct {
-		accept   func()
-		reject   func(error)
-		complete func(interface{}, error)
+		OnAccept   func()
+		OnReject   func(error)
+		OnComplete func(interface{}, error)
 	}
 )
 
@@ -778,15 +778,15 @@ func (c *MockCallWrapper) NotBefore(calls ...*MockCallWrapper) *MockCallWrapper
 }
 
 func (uc *TestUpdateCallback) Accept() {
-	uc.accept()
+	uc.OnAccept()
 }
 
 func (uc *TestUpdateCallback) Reject(err error) {
-	uc.reject(err)
+	uc.OnReject(err)
 }
 
 func (uc *TestUpdateCallback) Complete(success interface{}, err error) {
-	uc.complete(success, err)
+	uc.OnComplete(success, err)
 }
 
 // ExecuteWorkflow executes a workflow, wait until workflow complete. It will fail the test if workflow is blocked and
@@ -1103,11 +1103,11 @@ func (e *TestWorkflowEnvironment) UpdateWorkflowByID(workflowID, updateName, upd
 
 func (e *TestWorkflowEnvironment) UpdateWorkflowNoRejection(updateName string, updateID string, t mock.TestingT, args ...interface{}) {
 	uc := &TestUpdateCallback{
-		reject: func(err error) {
+		OnReject: func(err error) {
 			require.Fail(t, "update should not be rejected")
 		},
-		accept:   func() {},
-		complete: func(interface{}, error) {},
+		OnAccept:   func() {},
+		OnComplete: func(interface{}, error) {},
 	}
 	e.UpdateWorkflow(updateName, updateID, uc, args)
 }
diff --git a/internal/workflow_testsuite_test.go b/internal/workflow_testsuite_test.go
index d9aef5bf1..9abe099c2 100644
--- a/internal/workflow_testsuite_test.go
+++ b/internal/workflow_testsuite_test.go
@@ -275,11 +275,11 @@ func TestWorkflowIDUpdateWorkflowByID(t *testing.T) {
 	env := suite.NewTestWorkflowEnvironment()
 	env.RegisterDelayedCallback(func() {
 		err := env.UpdateWorkflowByID("my-workflow-id", "update", "id", &TestUpdateCallback{
-			reject: func(err error) {
+			OnReject: func(err error) {
 				require.Fail(t, "update should not be rejected")
 			},
-			accept:   func() {},
-			complete: func(interface{}, error) {},
+			OnAccept:   func() {},
+			OnComplete: func(interface{}, error) {},
 		}, "input")
 		require.NoError(t, err)
 	}, time.Second)
@@ -312,12 +312,12 @@ func TestChildWorkflowUpdate(t *testing.T) {
 	})
 	env.RegisterDelayedCallback(func() {
 		err := env.UpdateWorkflowByID("child-workflow", "child-handler", "1", &TestUpdateCallback{
-			accept: func() {
+			OnAccept: func() {
 			},
-			reject: func(err error) {
+			OnReject: func(err error) {
 				require.Fail(t, "update failed", err)
 			},
-			complete: func(result interface{}, err error) {
+			OnComplete: func(result interface{}, err error) {
 				if err != nil {
 					require.Fail(t, "update failed", err)
 				}
@@ -402,13 +402,13 @@ func TestWorkflowNotRegisteredRejected(t *testing.T) {
 	var updateRejectionErr error
 	env.RegisterDelayedCallback(func() {
 		env.UpdateWorkflow("update", "id", &TestUpdateCallback{
-			reject: func(err error) {
+			OnReject: func(err error) {
 				updateRejectionErr = err
 			},
-			accept: func() {
+			OnAccept: func() {
 				require.Fail(t, "update should not be accepted")
 			},
-			complete: func(interface{}, error) {},
+			OnComplete: func(interface{}, error) {},
 		})
 	}, 0)
 
@@ -433,13 +433,13 @@ func TestWorkflowUpdateOrderAcceptReject(t *testing.T) {
 	var updateRejectionErr error
 	env.RegisterDelayedCallback(func() {
 		env.UpdateWorkflow("bad update", "2", &TestUpdateCallback{
-			reject: func(err error) {
+			OnReject: func(err error) {
 				updateRejectionErr = err
 			},
-			accept: func() {
+			OnAccept: func() {
 				require.Fail(t, "update should not be accepted")
 			},
-			complete: func(interface{}, error) {},
+			OnComplete: func(interface{}, error) {},
 		})
 	}, 0)