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fix(@angular/build): use virtual module for Karma TestBed initialization
fix(@angular/build): safeguard Karma builder stream controller against closed state
refactor(@angular/build): extract karma application builder into smaller modules
fix(@angular/build): exclude .angular from coverage instrumentation
fix(@angular/build): correctly handle absolute paths and casing in test discovery
refactor(@angular/build): clean up duplicate of code in the karma builders
docs: update unit tests watch description
refactor(@angular/build): eliminate circular dependencies in bundler context