angular-cli: ng test with no --watch option hangs after test run

Bug Report or Feature Request (mark with an x)

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

Command (mark with an x)

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

Versions

OS: macOs Mojave 10.14 (18A391)

Angular CLI: 7.0.3
Node: 11.0.0
OS: darwin x64
Angular: 7.0.1
... animations, common, compiler, compiler-cli, core, forms
... http, language-service, platform-browser
... platform-browser-dynamic, router

Package                           Version
-----------------------------------------------------------
@angular-devkit/architect         0.10.3
@angular-devkit/build-angular     0.10.3
@angular-devkit/build-optimizer   0.10.3
@angular-devkit/build-webpack     0.10.3
@angular-devkit/core              7.0.3
@angular-devkit/schematics        7.0.3
@angular/cdk                      7.0.2
@angular/cli                      7.0.3
@angular/flex-layout              7.0.0-beta.19
@angular/material                 7.0.2
@ngtools/webpack                  7.0.3
@schematics/angular               7.0.3
@schematics/update                0.10.3
rxjs                              6.3.3
typescript                        3.1.3
webpack                           4.19.1

Repro steps

I have been able to reproduce this both with an existing project and a brand new project scaffolded with ng new and no changes made to the code. In mac os Terminal

1. Run ng test (no --watch option)
2. After test run the process does not exist
3. change code
4. Does not re-run tests
5. hit ctrl+c to exit, the browser window used to run the tests exit but the ng test process hangs and you must force exit it in Terminal

The log given by the failure

As far as I can tell, no logs are produced.

Desired functionality

Since the documentation states that the default value for the --watch option is false, ng test (no --watch option provided) should exhibit the same behavior as ng test --watch=false which is to run the tests once and exit.

Mention any other details that might be useful

While the ng test process is hanging, Activity Monitor shows a high number of threads used by the process