make jest support files that import handlebars

Change-Id: I073ea3f8b54cf46cd2b4c2437aad5ee13c95dc7c
Reviewed-on: https://gerrit.instructure.com/186286
Tested-by: Jenkins
Reviewed-by: Clay Diffrient <cdiffrient@instructure.com>
QA-Review: Clay Diffrient <cdiffrient@instructure.com>
Product-Review: Brent Burgoyne <bburgoyne@instructure.com>

frontend_build/i18nLinerHandlebars.js

@@ -147,7 +147,7 @@ const buildPartialRequirements = partialPaths => {
   return requirements
 }
 
-module.exports = function i18nLinerHandlebarsLoader(source) {
+function i18nLinerHandlebarsLoader(source) {
   this.cacheable()
   const name = resourceName(this.resourcePath)
   const dependencies = ['handlebars/runtime']
@@ -187,3 +187,13 @@ module.exports = function i18nLinerHandlebarsLoader(source) {
   )
   return compiledTemplate
 }
+
+module.exports = i18nLinerHandlebarsLoader
+
+module.exports.compile = (source, path) => {
+  const context = {
+    cacheable: () => {},
+    resourcePath: path
+  }
+  return i18nLinerHandlebarsLoader.call(context, source)
+}

jest.config.js

@@ -22,7 +22,9 @@ module.exports = {
   moduleNameMapper: {
     '^i18n!(.*$)': '<rootDir>/jest/i18nTransformer.js',
     '^compiled/(.*)$': '<rootDir>/app/coffeescripts/$1',
+    '^coffeescripts/(.*)$': '<rootDir>/app/coffeescripts/$1',
     '^jsx/(.*)$': '<rootDir>/app/jsx/$1',
+    '^jst/(.*)$': '<rootDir>/app/views/jst/$1',
     "^timezone$": "<rootDir>/public/javascripts/timezone_core.js",
     "\\.svg$": "<rootDir>/jest/imageMock.js"
   },
@@ -48,11 +50,12 @@ module.exports = {
 
   coverageDirectory: '<rootDir>/coverage-jest/',
 
-  moduleFileExtensions: [...defaults.moduleFileExtensions, 'coffee'],
+  moduleFileExtensions: [...defaults.moduleFileExtensions, 'coffee', 'handlebars'],
 
   transform: {
     '^i18n': '<rootDir>/jest/i18nTransformer.js',
     '^.+\\.coffee': '<rootDir>/jest/coffeeTransformer.js',
+    '^.+\\.handlebars': '<rootDir>/jest/handlebarsTransformer.js',
     '^.+\\.jsx?$': 'babel-jest'
   },
 }

jest/handlebarsTransformer.js

@@ -0,0 +1,26 @@
+/*
+ * Copyright (C) 2017 - present Instructure, Inc.
+ *
+ * This file is part of Canvas.
+ *
+ * Canvas is free software: you can redistribute it and/or modify it under
+ * the terms of the GNU Affero General Public License as published by the Free
+ * Software Foundation, version 3 of the License.
+ *
+ * Canvas is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+ * A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU Affero General Public License along
+ * with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+const {transform} = require('babel-core')
+const {compile} = require('../frontend_build/i18nLinerHandlebars')
+
+exports.process = (source, path) => {
+  const amd = compile(source, path)
+  const cjs = transform(amd, {plugins: ['transform-amd-to-commonjs']}).code
+  return cjs
+}