fix(test): exclude non spec files from test.ts (#3538)

Author: Meligy

packages/angular-cli/blueprints/ng2/files/__path__/test.ts

@@ -25,7 +25,7 @@ getTestBed().initTestEnvironment(
   platformBrowserDynamicTesting()
 );
 // Then we find all the tests.
-let context = require.context('./', true, /\.spec\.ts/);
+let context = require.context('./', true, /\.spec\.ts$/);
 // And load the modules.
 context.keys().map(context);
 // Finally, start Karma to run the tests.