add test for override

internal/cloud/testing.go

@@ -209,6 +209,7 @@ func testBackend(t *testing.T, obj cty.Value) (*Cloud, func()) {
 	b.client.CostEstimates = mc.CostEstimates
 	b.client.Organizations = mc.Organizations
 	b.client.Plans = mc.Plans
+	b.client.TaskStages = mc.TaskStages
 	b.client.PolicySetOutcomes = mc.PolicySetOutcomes
 	b.client.PolicyChecks = mc.PolicyChecks
 	b.client.Runs = mc.Runs