Enable Ivy in ng test

[alan-agius4]

🚀 Feature request

Command (mark with an x)

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

Description

At the moment https://v8.angular.io/guide/ivy documents how to opt-in into Ivy for builds, however this doesn't document how to opt-in into Ivy for tests. The same thing applies when generating a new Ivy application via the CLI. Ivy is only enabled for builds.

Describe the solution you'd like

We should enable the Ivy compiler for tests as well, for both JIT and AOT mode, This is needed, because when enabling the enableIvy compiler option in JIT mode it will use process the packages with ngcc and will use the Ivy engine which also improves runtime speed in JIT mode.

There are 2 ways that I can think of to achieve this. Either by adding enableIvy: true to the specs tsconfig, or the specs tsconfig extends the app tsconfig.

[filipesilva]

Closed via #15044, given that tests only run in JIT at the moment.

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