feat(i18n): extract messages

modules/@angular/compiler-cli/integrationtest/src/basic.html

@@ -1,4 +1,4 @@
-<div [attr.array]="[0]" [attr.map]="{a:1}">{{ctxProp}}</div>
+<div [attr.array]="[0]" [attr.map]="{a:1}" title="translate me" i18n-title="meaning|desc">{{ctxProp}}</div>
 <form><input type="button" [(ngModel)]="ctxProp"/></form>
 <my-comp *ngIf="ctxBool"></my-comp>
-<div *ngFor="let x of ctxArr" [attr.value]="x"></div>
+<div *ngFor="let x of ctxArr" [attr.value]="x"></div>

modules/@angular/compiler-cli/integrationtest/test/i18n_spec.ts

@@ -0,0 +1,26 @@
+// Only needed to satisfy the check in core/src/util/decorators.ts
+// TODO(alexeagle): maybe remove that check?
+require('reflect-metadata');
+
+require('@angular/platform-server/src/parse5_adapter.js').Parse5DomAdapter.makeCurrent();
+require('zone.js/dist/zone-node.js');
+require('zone.js/dist/long-stack-trace-zone.js');
+let serializer = require('@angular/compiler/src/i18n/xmb_serializer.js');
+
+import * as fs from 'fs';
+import * as path from 'path';
+
+describe("template i18n extraction output", () => {
+  const outDir = '';
+
+  it("should extract i18n messages", () => {
+    const xmbOutput = path.join(outDir, 'messages.xmb');
+    expect(fs.existsSync(xmbOutput)).toBeTruthy();
+    const xmb = fs.readFileSync(xmbOutput, {encoding: 'utf-8'});
+    const res = serializer.deserializeXmb(xmb);
+    const keys = Object.keys(res.messages);
+    expect(keys.length).toEqual(1);
+    expect(res.errors.length).toEqual(0);
+    expect(res.messages[keys[0]][0].value).toEqual('translate me');
+  });
+});