`ng test` doesn't watch when first compilation fails

[mrkvon]

Bug Report or Feature Request (mark with an x)

- [x] bug report -> please search issues before submitting
- [ ] feature request

Versions.

@angular/cli: 1.4.5
node: 8.4.0
os: linux x64
@angular/animations: 4.4.4
@angular/common: 4.4.4
@angular/compiler: 4.4.4
@angular/core: 4.4.4
@angular/forms: 4.4.4
@angular/http: 4.4.4
@angular/platform-browser: 4.4.4
@angular/platform-browser-dynamic: 4.4.4
@angular/router: 4.4.4
@angular/cli: 1.4.5
@angular/compiler-cli: 4.4.4
@angular/language-service: 4.4.4
typescript: 2.3.4

Repro steps.

• ng new testproject
• introduce a syntax error to ./src/app/app.component.ts
• run ng test and see the error message
• fix the syntax error and save
• doesn't recompile, tests are not rerun

The log given by the failure.

Desired functionality.

The watch should work independently of success/failure of the first compilation.

Mention any other details that might be useful.

• happened after update 1.3.2 > 1.4.5
• the issue happens only when the first compilation fails. i.e. when the first compilation passes and the next one fails, the further behavior is as expected (still watching and recompiling)

[hansl]

@mrkvon,

I could reproduce and see the error, but I cannot find the reason. Assigning @filipesilva as he was the one working on the karma plugin last.

[m-henderson]

@filipesilva will you please reply here with the PR when you fix this issue. I would like to know how you fixed it. Thanks much.

[filipesilva]

I checked now with the latest version 1.4.9 and it seems to be fixed.

@m-henderson I believe it was fixed in #7933, by forcing TS to always emit even with errors on the first build. This allows webpack to follow the dependency tree and correctly watch those files for rebuilds.

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