test(Form): add happy path

[timdeschryver]

What:

Added a happy path test for the form example. This is done with ngx-test-library.

Issue number: N/A

[codecov-io]

Codecov Report

Merging #411 into master will decrease coverage by 27.7%. The diff coverage is n/a.

@@             Coverage Diff             @@
##           master     #411       +/-   ##
===========================================
- Coverage   86.48%   58.77%   -27.71%     
===========================================
  Files          66       66               
  Lines        1043     1043               
  Branches       46       46               
===========================================
- Hits          902      613      -289     
- Misses        126      424      +298     
+ Partials       15        6        -9

Impacted Files	Coverage Δ
.../app/examples/stock-market/stock-market.reducer.ts	30% <0%> (-70%)	:arrow_down:
src/app/examples/form/form.reducer.ts	33.33% <0%> (-66.67%)	:arrow_down:
src/app/core/auth/auth.reducer.ts	33.33% <0%> (-66.67%)	:arrow_down:
src/app/settings/settings.reducer.ts	33.33% <0%> (-66.67%)	:arrow_down:
src/app/examples/todos/todos.reducer.ts	28.57% <0%> (-64.29%)	:arrow_down:
...-reducers/init-state-from-local-storage.reducer.ts	37.5% <0%> (-62.5%)	:arrow_down:
...ples/todos/components/todos-container.component.ts	37.09% <0%> (-56.46%)	:arrow_down:
src/app/examples/crud/books.reducer.ts	46.15% <0%> (-53.85%)	:arrow_down:
...ket/components/stock-market-container.component.ts	50% <0%> (-50%)	:arrow_down:
...ettings/components/settings-container.component.ts	44.44% <0%> (-50%)	:arrow_down:
... and 36 more

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[tomastrajan]

Also that codecov, that's strange, but haven't investigated yet ...

[tomastrajan]

@timdeschryver merge whenever you're ready ;)

[timdeschryver]

Yea, I was looking at codecov numbers but can't find a reason. Let's see how this evolves...