adwiii opened a new pull request #87: Added additional tests for map classes based on mutation results URL: https://github.com/apache/commons-collections/pull/87 I used this project as a learning tool for getting familiar with [Pitest](http://pitest.org/) mutation testing and picked a few test classes to improve based on the result. I picked the below classes because the current test suite provides 100% line coverage, but PIT found surviving mutants. ### Transformed Map In the `TransformedMapTest` class, the `testFactory_decorateTransform` method did not provide a key transformer. In `TransformedMap::transformedMap` the call to `decorated.clear()` is only necessary if the key transformer changes the key set. This adds a test with a key transformer. ### Lazy Sorted Map and Predicated Map Both `LazySortedMap` and `PredicatedMap` have tests that check if the comparator is null, but never check for a non-null value. The added tests check that if a non-null comparator is used then it is properly returned.
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