Based on Travis saying that all the tests pass, I'm assuming that the test failures I'm seeing are because I'm on Windows.

The 4 tests that fail are: Failed tests: testMD5Fingerprint(ro.isdc.wro.manager.TestWroManager): expected:<[9394d6cdd0a75a5f695c84eda410103f]/g3.css?minimize=tru...> but was:<[dcafadd7f368bc95d003eae8e876a324]/g3.css?minimize=tru...> testCRC32Fingerprint(ro.isdc.wro.manager.TestWroManager): expected:<[1d62dbaf]/g3.css?minimize=tru...> but was:<[3be24cf6]/g3.css?minimize=tru...> testSHA1DefaultHashBuilder(ro.isdc.wro.manager.TestWroManager): expected:<[aebaedcdec8131230d47259be7a628b5dfeff6ba]/g3.css?minimize=tru...> but was:<[6c76dfce26865e6d47a8038e79350ed87211cfdf]/g3.css?minimize=tru...> shouldGenerateCorrectDataURIForCSSWithCharset(ro.isdc.wro.model.resource.processor.support.TestDataUriGenerator): expected:<...,aW5wdXQuYnV0dG9uIHs[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]> but was:<...,aW5wdXQuYnV0dG9uIHs[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]>

These tests fails because of the difference of line ending characters between windows and Unix which cause generation of different hash.

A possible solution is to run those tests only on unix platform.