HARP 14470

[nzjony]

• nyc only supports code coverage in node, however we have a number of browser based tests, and it is the primary use case, so we have decided to do the code coverage in karma.
• the karma.conf.js previously used the pre-bundled test bundle, but this doesn't give us the code coverage per line number, I could have tried to find a way to remap the bundle to lines, but because the karma-typescript project is well maintained, I went this road. This however means there is a lot of configuration to get the tests running correctly, especially those that need to load resources.
• note also, there are quite a few tests that time out when run in the browser, hence the need to change the timeout in some cases
• note also, karma outputs the code coverage format using lcov, this is different to nyc and means that the code coverage drops a lot, this is because the lcov format can tell if a line is fully covered, i.e. for an if statement, it records if both true and false variants are executed. As such, lines without full branch coverage are treated as not covered, and this reduces the code coverage in the codecov.io report available via github. The local text report which is shown when running yarn cov-test doesn't have this behaviour, i.e lines that have just one branch executed are counted as part of the code coverage.
• moved most of the karma.conf.js to karma.options.js, so it can be shared and extended with the sdk and added the ability to prefix the files / exclude so that this repo works next to the sdk correctly.

[codecov]

Codecov Report

Merging #2173 (e5e932e) into master (b5c7a1a) will decrease coverage by 1.79%.
The diff coverage is 75.00%.

@@            Coverage Diff             @@
##           master    #2173      +/-   ##
==========================================
- Coverage   68.44%   66.64%   -1.80%     
==========================================
  Files         299      312      +13     
  Lines       26526    27745    +1219     
  Branches     6009     6199     +190     
==========================================
+ Hits        18156    18491     +335     
- Misses       8370     9254     +884     

Impacted Files	Coverage Δ
@here/harp-test-utils/lib/ProfileHelper.ts	17.44% <ø> (ø)
@here/harp-utils/lib/UrlPlatformUtils.ts	80.00% <75.00%> (-20.00%)	⬇️
@here/harp-utils/lib/PerformanceTimer.ts	80.00% <0.00%> (-10.00%)	⬇️
@here/harp-mapview/lib/CameraMovementDetector.ts	87.32% <0.00%> (-5.64%)	⬇️
@here/harp-mapview/lib/MapView.ts	73.32% <0.00%> (-0.34%)	⬇️
@here/harp-mapview/lib/ConcurrentWorkerSet.ts	66.66% <0.00%> (ø)
@here/harp-utils/lib/Logger/index.ts
...eojson-datasource/lib/GeoJsonTileDecoderService.ts
@here/harp-mapview/lib/composing/index.ts
...ere/harp-test-utils/lib/rendering/DomImageUtils.ts	12.35% <0.00%> (ø)
... and 28 more

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[nzjony]

Closing / reopening to retrigger sdk pipeline.