fix(amd): Added coverage tests and fixed minor bugs.
chore(cache): Added coverage tests
chore(di): Added coverage tests
chore(test): Added blacklist and whitelist to make coverage test results more meaningful.
chore(router): Added coverage tests
chore(core): Added coverage tests for context service
chore(core): Added coverage tests for external files service
chore(cache): Added coverage tests for LRU cache
Merge pull request #7708 from Srokap/coverage

Improves test coverage