cmd/heapview: add karma+jasmine TS unit testing config

Add a configuration that allows unit testing of client Typescript
code using Karma and Jasmine. Add a basic test to exercise this.

Change-Id: I88af82b68547423efeaafb0fab8214ed39573ee9
Reviewed-on: https://go-review.googlesource.com/25411
Reviewed-by: David Crawshaw <crawshaw@golang.org>
Reviewed-by: Evan Martin <evanm@google.com>

cmd/heapview/client/.clang-format

@@ -0,0 +1 @@
+BasedOnStyle: Google

cmd/heapview/client/main.ts

@@ -3,6 +3,5 @@
 // license that can be found in the LICENSE file.
 
 export function main() {
-    document.title = "Go Heap Viewer"; 
+  document.title = 'Go Heap Viewer';
 }
- 

cmd/heapview/client/main_test.ts

@@ -0,0 +1,12 @@
+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+import {main} from './main';
+
+describe("main", () => {
+  it('sets the document\'s title', () => {
+    main();
+    expect(document.title).toBe('Go Heap Viewer');
+  });
+});

cmd/heapview/client/package.json

@@ -12,10 +12,23 @@
     "If you do have npm installed, use the `npm i` command",
     "in this directory to install the typings."
   ],
-
   "private": true,
-  "dependencies": {
+  "name": "@golangtools/heapview",
-    "@types/es6-promise": "0.0.28",
+  "version": "0.0.0",
-    "@types/whatwg-fetch": "0.0.27"
+  "devDependencies": {
+    "@types/webcomponents.js": "latest",
+    "@types/whatwg-fetch": "latest",
+    "@types/jasmine": "latest",
+
+    "jasmine-core": "latest",
+    "karma": "latest",
+    "karma-jasmine": "latest",
+    "karma-chrome-launcher": "latest",
+
+    "clang-format": "latest"
+  },
+  "scripts": {
+    "test": "karma start testing/karma.conf.js",
+    "format": "find . | grep '\\(test_main\\.js\\|\\.ts\\)$' | xargs clang-format -i"
   }
 }

cmd/heapview/client/testing/karma.conf.js

@@ -0,0 +1,21 @@
+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+module.exports = config => {
+    config.set({
+        frameworks: ['jasmine'],
+        basePath: '../../../..',
+        files: [
+            'third_party/typescript/typescript.js',
+            'third_party/moduleloader/moduleloader.js',
+            'cmd/heapview/client/testing/test_main.js',
+            {pattern: 'cmd/heapview/client/**/*.ts', included: false},
+        ],
+        browsers: ['Chrome'],
+        plugins: [
+            'karma-jasmine',
+            'karma-chrome-launcher'
+        ],
+    })
+}

cmd/heapview/client/testing/test_main.js

@@ -0,0 +1,29 @@
+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Configure module loader.
+System.transpiler = 'typescript'
+System.locate = (load) => load.name + '.ts';
+
+// Determine set of test files.
+var tests = [];
+for (var file in window.__karma__.files) {
+  if (window.__karma__.files.hasOwnProperty(file)) {
+    if (/_test\.ts$/.test(file)) {
+      tests.push(file.slice(0, -3));
+    }
+  }
+}
+
+// Steal loaded callback so we can block until we're
+// done loading all test modules.
+var loadedCallback = window.__karma__.loaded.bind(window.__karma__);
+window.__karma__.loaded = () => {};
+
+// Load all test modules, and then call loadedCallback.
+var promises = [];
+for (var i = 0; i < tests.length; i++) {
+  promises.push(System.import(tests[i]));
+}
+Promise.all(promises).then(loadedCallback);

cmd/heapview/client/tslint.json

@@ -0,0 +1,40 @@
+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// This tslint file is based on a configuration used at
+// Google.
+
+{
+  "rules": {
+    "class-name": true,
+    "forin": true,
+    "interface-name": [true, "never-prefix"],
+    "jsdoc-format": true,
+    "label-position": true,
+    "label-undefined": true,
+    "new-parens": true,
+    "no-angle-bracket-type-assertion": true,
+    "no-construct": true,
+    "no-debugger": true,
+    "no-namespace": [true, "allow-declarations"],
+    "no-reference": true,
+    "no-require-imports": true,
+    "no-unused-expression": true,
+    "no-unused-variable": true,
+    "no-use-before-declare": true,
+    "no-var-keyword": true,
+    "semicolon": [true, "always"],
+    "switch-default": true,
+    "triple-equals": [true, "allow-null-check"],
+    "use-isnan": true,
+    "variable-name": [
+      true,
+      "check-format",
+      "ban-keywords",
+      "allow-leading-underscore",
+      "allow-trailing-underscore",
+      "allow-pascal-case"
+    ]
+  }
+}