Missing open parenthesis in stacktrace

[segrey]

Bug report

Command (mark with an x)

- [ ] new
- [ ] build
- [ ] serve
- [x] test
- [ ] e2e
- [ ] generate
- [ ] add
- [ ] update
- [ ] lint
- [ ] xi18n
- [ ] run
- [ ] config
- [ ] help
- [ ] version
- [ ] doc

Is this a regression?

Yes, the previous version in which this bug was not present was: 6.2.9

Description

Lines in the following failed assertion stack trace misses the open parenthesis:

Expected ' Welcome to my-app! ' to contain 'Another text'.
    at UserContext.<anonymous> src/app/app.component.spec.ts:29:54)
    at ZoneDelegate../node_modules/zone.js/dist/zone.js.ZoneDelegate.invoke node_modules/zone.js/dist/zone.js:391:1)
    at ProxyZoneSpec.push../node_modules/zone.js/dist/zone-testing.js.ProxyZoneSpec.onInvoke node_modules/zone.js/dist/zone-testing.js:289:1)
    at ZoneDelegate../node_modules/zone.js/dist/zone.js.ZoneDelegate.invoke node_modules/zone.js/dist/zone.js:390:1)

🔬 Minimal Reproduction

1. ng new my-app --defaults
2. cd my-app and make any test failing. For example, open src/app/app.component.spec.ts and replace 'Welcome to my-app2!' with 'Test' here:

expect(compiled.querySelector('h1').textContent).toContain('Welcome to my-app2!')

3. ng test => 1 test failed as expected
   The command output contains stacktrace with missing open parentheses:

Expected ' Welcome to my-app2! ' to contain 'Test'.
    at UserContext.<anonymous> src/app/app.component.spec.ts:29:54)
    at ZoneDelegate../node_modules/zone.js/dist/zone.js.ZoneDelegate.invoke node_modules/zone.js/dist/zone.js:391:1)
    at ProxyZoneSpec.push../node_modules/zone.js/dist/zone-testing.js.ProxyZoneSpec.onInvoke node_modules/zone.js/dist/zone-testing.js:289:1)
    at ZoneDelegate../node_modules/zone.js/dist/zone.js.ZoneDelegate.invoke node_modules/zone.js/dist/zone.js:390:1)

Your Environment

$ ng version

     _                      _                 ____ _     ___
    / \   _ __   __ _ _   _| | __ _ _ __     / ___| |   |_ _|
   / △ \ | '_ \ / _` | | | | |/ _` | '__|   | |   | |    | |
  / ___ \| | | | (_| | |_| | | (_| | |      | |___| |___ | |
 /_/   \_\_| |_|\__, |\__,_|_|\__,_|_|       \____|_____|___|
                |___/
    

Angular CLI: 7.3.0
Node: 11.7.0
OS: linux x64
Angular: 7.2.3
... animations, common, compiler, compiler-cli, core, forms
... language-service, platform-browser, platform-browser-dynamic
... router

Package                           Version
-----------------------------------------------------------
@angular-devkit/architect         0.13.0
@angular-devkit/build-angular     0.13.0
@angular-devkit/build-optimizer   0.13.0
@angular-devkit/build-webpack     0.13.0
@angular-devkit/core              7.3.0
@angular-devkit/schematics        7.3.0
@angular/cli                      7.3.0
@ngtools/webpack                  7.3.0
@schematics/angular               7.3.0
@schematics/update                0.13.0
rxjs                              6.3.3
typescript                        3.2.4
webpack                           4.29.0

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