Add tests for session selection component

[snss231]

Summary:

Fixes #972

Changes Made:

• Add unit test to ensure that when the child ProfilesComponent emits a profile, the selected profile's repoName is correctly reflected in the session input.

Proposed Commit Message:

SessionSelectionComponent: add tests

Let's add a test to verify that the SessionSelectionComponent
shows the correct repo name in the session input when the
selected profile is emitted from the child ProfilesComponent.

[snss231]

@chunweii Thanks for your review :) I've made the changes and pushed accordingly.

[codecov-commenter]

Codecov Report

Base: 62.31% // Head: 60.31% // Decreases project coverage by -2.00% ⚠️

Coverage data is based on head (47b3a73) compared to base (d85e0c6).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #973      +/-   ##
==========================================
- Coverage   62.31%   60.31%   -2.01%     
==========================================
  Files          86       95       +9     
  Lines        1937     2046     +109     
  Branches      215      220       +5     
==========================================
+ Hits         1207     1234      +27     
- Misses        695      777      +82     
  Partials       35       35              

Impacted Files	Coverage Δ
...p/shared/action-toasters/action-toasters.module.ts	100.00% <0.00%> (ø)
.../app/shared/error-toasters/error-toaster.module.ts	100.00% <0.00%> (ø)
...shared/error-toasters/toaster/toaster.component.ts	50.00% <0.00%> (ø)
...h/session-selection/session-selection.component.ts	41.17% <0.00%> (ø)
...tials-error/invalid-credentials-error.component.ts	50.00% <0.00%> (ø)
.../core/directives/form-disable-control.directive.ts	50.00% <0.00%> (ø)
src/app/shared/lib/session.ts	0.00% <0.00%> (ø)
src/app/core/services/auth.service.ts	9.52% <0.00%> (ø)
src/app/shared/shared.module.ts	100.00% <0.00%> (ø)

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