add tests for extra triggers

Author: aminya

spec/spec.js

@@ -99,5 +99,65 @@ pluginTester({
         removeAll: true,
       },
     },
+
+    // with extra comment and directive triggers
+    {
+      code: `
+      "use strict";
+      "use babel";
+      `,
+      output: `
+      "use babel";
+      `,
+      pluginOptions: {
+        directiveTriggers: ['use babel'],
+        commentTriggers: ['@babel', '@flow', '* @babel', '* @flow'],
+      },
+    },
+    {
+      code: `
+      "use strict";
+      /** @babel */
+      let x = 1;
+      `,
+      output: `
+      /** @babel */
+      let x = 1;
+      `,
+      pluginOptions: {
+        directiveTriggers: ['use babel'],
+        commentTriggers: ['@babel', '@flow', '* @babel', '* @flow'],
+      },
+    },
+    {
+      code: `
+      "use strict";
+      // @babel
+      let x = 1;
+      `,
+      output: `
+      // @babel
+      let x = 1;
+      `,
+      pluginOptions: {
+        directiveTriggers: ['use babel'],
+        commentTriggers: ['@babel', '@flow', '* @babel', '* @flow'],
+      },
+    },
+    {
+      code: `
+      "use strict";
+      // @flow
+      let x = 1;
+      `,
+      output: `
+      // @flow
+      let x = 1;
+      `,
+      pluginOptions: {
+        directiveTriggers: ['use babel'],
+        commentTriggers: ['@babel', '@flow', '* @babel', '* @flow'],
+      },
+    },
   ]
 })