test: Convert fixtures to TS (#848)

test/fixtures/example.js

@@ -1,7 +0,0 @@
-module.exports = app => {
-  app.log('loaded app')
-
-  app.on('issue_comment.created', context => {
-    context.log('Comment created')
-  })
-}

test/fixtures/example.ts

@@ -0,0 +1,9 @@
+import { Application } from '../../src/application'
+
+export = (app: Application) => {
+  app.log('loaded app')
+
+  app.on('issue_comment.created', async context => {
+    context.log('Comment created')
+  })
+}

test/fixtures/plugin/stub-plugin.js

@@ -1 +0,0 @@
-module.exports = function () {}

test/fixtures/plugin/stub-plugin.ts

@@ -0,0 +1,2 @@
+// tslint:disable-next-line:no-empty
+export = () => {}