test: add tests for LAFE and RFE

Initialset of tests for LaughterFeatureExtractor and
RandomFeatureExtractor

test/test_feature_extractors.py

@@ -0,0 +1,50 @@
+"""test_feature_extractors.py - test pipeline feature extractors"""
+import unittest
+import os
+import pytest
+import pipeline.feature_extractors as extractors
+
+from pipeline.utils import Source, SourceMedia # technically makes this an integration test, but...
+class TestSource():
+    """Provide utils.Source for testing"""
+    def one_colour_silent_audio(self):
+        """Provide a source with a silent mono-colour video"""
+        TEST_DIR = os.path.dirname(os.path.realpath(__file__))
+        SAMPLE_VIDEO = f"{TEST_DIR}/sample_videos/test_video_red_silentaudio.mp4" # silent video definitely has no laughter
+        return Source(source=SAMPLE_VIDEO, path=SAMPLE_VIDEO, provider="test")
+
+class TestLaughterFeatureExtractor(unittest.TestCase):
+    """Test LaughterFeatureExtractor"""
+    def test_init(self):
+        test_extractor = extractors.LaughterFeatureExtractor()
+        self.assertTrue(test_extractor)
+
+    def test_setup_noinput(self):
+        """test setup - no input files"""
+        test_extractor = extractors.LaughterFeatureExtractor()
+        with self.assertRaises(ValueError):
+            test_extractor.setup()
+        # NB test WITH sources implicitly tested in test_extract
+
+class TestRandomFeatureExtractor(unittest.TestCase):
+    """Test RandomFeatureExtractor"""
+    def test_init(self):
+        test_extractor = extractors.RandomFeatureExtractor()
+        self.assertTrue(test_extractor)
+
+    def test_setup_noinput(self):
+        """test setup - no input files"""
+        test_extractor = extractors.RandomFeatureExtractor()
+        with self.assertRaises(ValueError):
+            test_extractor.setup()
+        # NB test WITH sources implicitly tested in test_extract
+
+    def test_extract(self):
+        """Test extract with input files"""
+        video_source = TestSourceMedia().one_colour_silent_audio()
+        test_extractor = extractors.RandomFeatureExtractor(input_files=video_source)
+        test_extractor.setup()
+        test_extractor.run()
+        test_extractor.teardown()
+        self.assertTrue(test_extractor.features)
+