diff --git a/pkg/graph/resolvers/model_plan_test.go b/pkg/graph/resolvers/model_plan_test.go
index ab2e68338c..b13eca8a71 100644
--- a/pkg/graph/resolvers/model_plan_test.go
+++ b/pkg/graph/resolvers/model_plan_test.go
@@ -39,6 +39,8 @@ func (suite *ResolverSuite) TestModelPlanCreate() {
 	suite.Nil(result.ModifiedBy)
 	suite.Nil(result.ModifiedDts)
 	suite.EqualValues(models.ModelStatusPlanDraft, result.Status)
+	suite.Nil(result.MTOReadyForReviewBy)
+	suite.Nil(result.MTOReadyForReviewDts)
 }
 
 func (suite *ResolverSuite) TestModelPlanUpdate() {
diff --git a/pkg/graph/resolvers/mto_test.go b/pkg/graph/resolvers/mto_test.go
new file mode 100644
index 0000000000..8484b4d1f0
--- /dev/null
+++ b/pkg/graph/resolvers/mto_test.go
@@ -0,0 +1,61 @@
+package resolvers
+
+func (suite *ResolverSuite) TestMTOToggleReadyForReview() {
+	plan := suite.createModelPlan("plan for testing MTO mark ready for review")
+
+	markedReadyPrinc := suite.getTestPrincipal(suite.testConfigs.Store, "tester")
+
+	// don't set it
+	mto1, err := MTOToggleReadyForReview(suite.testConfigs.Context, suite.testConfigs.Logger,
+		suite.testConfigs.Principal, suite.testConfigs.Store, plan.ID, false)
+	suite.NoError(err)
+	if suite.NotNil(mto1, "mto shouldn't be nil") {
+		suite.Nil(mto1.ModelPlan.MTOReadyForReviewBy)
+		suite.Nil(mto1.ModelPlan.MTOReadyForReviewDts)
+	}
+
+	// mark ready for review by the tester
+	mto2, err2 := MTOToggleReadyForReview(suite.testConfigs.Context, suite.testConfigs.Logger,
+		markedReadyPrinc, suite.testConfigs.Store, plan.ID, true)
+	suite.NoError(err2)
+	if suite.NotNil(mto2, "mto shouldn't be nil") {
+		if suite.NotNil(mto2.ModelPlan.MTOReadyForReviewBy) {
+			suite.EqualValues(markedReadyPrinc.UserAccount.ID, *mto2.ModelPlan.MTOReadyForReviewBy,
+				"the mto should have been marked ready for review by the tester principal")
+		}
+		suite.NotNil(mto2.ModelPlan.MTOReadyForReviewDts)
+	}
+
+	// try to mark ready for review by the default principal
+	mto3, err3 := MTOToggleReadyForReview(suite.testConfigs.Context, suite.testConfigs.Logger,
+		markedReadyPrinc, suite.testConfigs.Store, plan.ID, true)
+	suite.NoError(err3)
+	if suite.NotNil(mto3, "mto shouldn't be nil") {
+		if suite.NotNil(mto3.ModelPlan.MTOReadyForReviewBy) {
+			suite.EqualValues(markedReadyPrinc.UserAccount.ID, *mto3.ModelPlan.MTOReadyForReviewBy,
+				"the mto should have been marked ready for review by the tester principal")
+		}
+		suite.NotNil(mto3.ModelPlan.MTOReadyForReviewDts)
+	}
+
+	// try to mark not ready for review by the default principal
+	mto4, err4 := MTOToggleReadyForReview(suite.testConfigs.Context, suite.testConfigs.Logger,
+		markedReadyPrinc, suite.testConfigs.Store, plan.ID, false)
+	suite.NoError(err4)
+	if suite.NotNil(mto4, "mto shouldn't be nil") {
+		suite.Nil(mto4.ModelPlan.MTOReadyForReviewBy)
+		suite.Nil(mto4.ModelPlan.MTOReadyForReviewDts)
+	}
+
+	// try to mark ready for review by the default principal
+	mto5, err5 := MTOToggleReadyForReview(suite.testConfigs.Context, suite.testConfigs.Logger,
+		markedReadyPrinc, suite.testConfigs.Store, plan.ID, true)
+	suite.NoError(err5)
+	if suite.NotNil(mto5, "mto shouldn't be nil") {
+		if suite.NotNil(mto5.ModelPlan.MTOReadyForReviewBy) {
+			suite.EqualValues(markedReadyPrinc.UserAccount.ID, *mto5.ModelPlan.MTOReadyForReviewBy,
+				"the mto should have been marked ready for review by the default principal")
+		}
+		suite.NotNil(mto5.ModelPlan.MTOReadyForReviewDts)
+	}
+}