Add test cases for Vue directive

vue/vue-tests.ts

@@ -30,9 +30,20 @@ namespace TestGlobalAPI {
     twoWay: true,
     acceptStatement: true,
     priority: 1,
+    terminal: true,
     count: 30
   });
-  Vue.directive("my-directive", () => {});
+  Vue.directive("my-directive", function() {
+    const d = this as vuejs.Directive;
+    d.el;
+    d.vm;
+    d.expression;
+    d.arg;
+    d.name;
+    d.modifiers;
+    d.descriptor;
+    d.params;
+  });
   var myDirective = Vue.directive("my-directive");
   var elementDirective = Vue.elementDirective("element-directive");
   Vue.elementDirective("element-directive", elementDirective);