itest: add coverage for disabling blinded forwards

itest/list_on_test.go

@@ -578,6 +578,10 @@ var allTestCases = []*lntest.TestCase{
 		Name:     "introduction blinded error",
 		TestFunc: testIntroductionNodeError,
 	},
+	{
+		Name:     "disable introduction node",
+		TestFunc: testDisableIntroductionNode,
+	},
 	{
 		Name:     "removetx",
 		TestFunc: testRemoveTx,