EveryVoice

a9f0cab0 - feat: clean up cached preprocessed audio after unittests (#386)

feat: clean up cached preprocessed audio after unittests (#386) * feat: mixin to preprocess audio during unittests * test: using setUp() instead of setUpClass() * After Eric's help * first working version * fixup! Using BasicTestCase for its contact & data_dir * feat: declaring the class variables outsite a class method * feat: renamed PreprocessedInputFixture to PreprocessedAudioFixture * code review suggestions