Add profiles component tests

[snss231]

Summary:

Fixes #601

Changes Made:

• Add DOM test for ensuring that correct profiles are loaded into the mat-select
• Add component test for ensuring that the right profile (name and repo name) is emitted
• Fix import order in src/test.ts which is required to enable some test utilities (e.g. fakeAsync)

To test that the selected profile and repo name is correctly displayed, we can look into writing component tests for the sessionSelectionComponent.

Proposed Commit Message:

ProfilesComponent: add tests

Let's add tests to verify that ProfilesComponent:
- displays the right profile names in the select element
- emits the correct profile when clicked

[codecov-commenter]

Codecov Report

Base: 58.49% // Head: 58.03% // Decreases project coverage by -0.45% ⚠️

Coverage data is based on head (0908450) compared to base (34ef62d).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #971      +/-   ##
==========================================
- Coverage   58.49%   58.03%   -0.46%     
==========================================
  Files          98      100       +2     
  Lines        2248     2295      +47     
  Branches      255      260       +5     
==========================================
+ Hits         1315     1332      +17     
- Misses        889      917      +28     
- Partials       44       46       +2     

Impacted Files	Coverage Δ
src/test.ts	100.00% <ø> (ø)
src/app/auth/profiles/profiles.component.ts	36.36% <0.00%> (ø)
...-error-dialog/json-parse-error-dialog.component.ts	33.33% <0.00%> (ø)

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[gycgabriel]

Need reviews from developers more familiar with tests @CATcher-org/developers

[kkangs0226]

LGTM other than a small nitpick! 👍

[kkangs0226]

I think it might be clearer if we specify the name of the function selectProfile that is triggered when mat-option is clicked

[snss231]

Changed the spec description to should emit the correct profile through selectProfile when mat-option is clicked. Hope that is satisfactory!

[kkangs0226]

LGTM