feat(@angular/cli): add --preserve-symlinks to ng test

Fix #7081

Author: filipesilva

packages/@angular/cli/commands/test.ts

@@ -5,7 +5,7 @@ import { oneLine } from 'common-tags';
 
 const config = CliConfig.fromProject() || CliConfig.fromGlobal();
 const testConfigDefaults = config.getPaths('defaults.build', [
-  'progress', 'poll'
+  'progress', 'poll', 'preserveSymlinks'
 ]);
 
 export interface TestOptions {
@@ -23,6 +23,7 @@ export interface TestOptions {
   poll?: number;
   environment?: string;
   app?: string;
+  preserveSymlinks?: boolean;
 }
 
 
@@ -109,6 +110,12 @@ const TestCommand = Command.extend({
       aliases: ['e'] ,
       description: 'Defines the build environment.'
     },
+    {
+      name: 'preserve-symlinks',
+      type: Boolean,
+      description: 'Do not use the real path when resolving modules.',
+      default: testConfigDefaults['preserveSymlinks']
+    },
     {
       name: 'app',
       type: String,

packages/@angular/cli/plugins/karma.ts

@@ -54,6 +54,7 @@ const init: any = (config: any, emitter: any, customFileHandlers: any) => {
     codeCoverage: false,
     sourcemaps: true,
     progress: true,
+    preserveSymlinks: false,
   }, config.angularCli);
 
   if (testConfig.sourcemaps) {

packages/@angular/cli/tasks/test.ts

@@ -40,6 +40,7 @@ export default Task.extend({
         progress: options.progress,
         poll: options.poll,
         environment: options.environment,
+        preserveSymlinks: options.preserveSymlinks,
         app: options.app
       };