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These changes together stabilize the test suite and bring the code coverage to 100% (line/branch).
Commit details
Composer: improve PHPUnit version constraints
... as PHPUnit < 5.7.21 doesn't contain the forward compatibility layer with namespaced classes.
PHPUnit: improve configuration
junit
is used somewhere, generating this report for code coverage is unnecessary.ConsoleColor: mark two methods as untestable
These methods cannot be tested as the result is system dependent and cannot be emulated.
ConsoleColor::addTheme(): add test for exception
ConsoleColor::getThemes(): add perfunctory unit test
Tests: add @Covers tag
... to document what each test is testing.