CC-5709: Airtime Analyzer

* Fixed the unit tests
* Improved length testing because it seems to fluctuate a bit with
  your mutagen version (great, eh?)

python_apps/airtime_analyzer/tests/analyzer_pipeline_tests.py

@@ -22,15 +22,15 @@ def test_basic():
     q = multiprocessing.Queue()
     #This actually imports the file into the "./Test Artist" directory.
     AnalyzerPipeline.run_analysis(q, DEFAULT_AUDIO_FILE, u'.', filename)
-    results = q.get()
-    assert results['track_title'] == u'Test Title'
-    assert results['artist_name'] == u'Test Artist'
-    assert results['album_title'] == u'Test Album'
-    assert results['year'] == u'1999'
-    assert results['genre'] == u'Test Genre'
-    assert results['mime'] == 'audio/mpeg' # Not unicode because MIMEs aren't.
-    assert results['length_seconds'] == 3.90925
-    assert results["length"] == str(datetime.timedelta(seconds=results["length_seconds"]))
+    metadata = q.get()
+    assert metadata['track_title'] == u'Test Title'
+    assert metadata['artist_name'] == u'Test Artist'
+    assert metadata['album_title'] == u'Test Album'
+    assert metadata['year'] == u'1999'
+    assert metadata['genre'] == u'Test Genre'
+    assert metadata['mime'] == 'audio/mpeg' # Not unicode because MIMEs aren't.
+    assert abs(metadata['length_seconds'] - 3.9) < 0.1
+    assert metadata["length"] == str(datetime.timedelta(seconds=metadata["length_seconds"]))
     assert os.path.exists(DEFAULT_IMPORT_DEST)
 
 @raises(TypeError)