Add missing files

insomniac/extra_features/face_detector.py

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+from insomniac import activation_controller
+
+exec(activation_controller.get_extra_feature('face_detector'))

insomniac/tests/face_detector_tests.py

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+import os
+import unittest
+
+from insomniac.extra_features.face_detector import FaceDetector
+
+
+class FaceDetectorTests(unittest.TestCase):
+
+    ASSETS_DIR = "assets"
+    face_detector = FaceDetector()
+
+    def setUp(self):
+        print("Initializing FaceDetector")
+        self.face_detector.init()
+
+    def test_positive(self):
+        for file in os.listdir(self.ASSETS_DIR):
+            filename = os.fsdecode(file)
+            if filename.startswith("face"):
+                is_face = self.face_detector.is_face_on_image_by_filename(os.path.join(self.ASSETS_DIR, file))
+                assert is_face
+
+    def test_negative(self):
+        for file in os.listdir(self.ASSETS_DIR):
+            filename = os.fsdecode(file)
+            if filename.startswith("notface"):
+                is_face = self.face_detector.is_face_on_image_by_filename(os.path.join(self.ASSETS_DIR, file))
+                assert not is_face
+
+    @staticmethod
+    def _interpret_faces_array(faces) -> str:
+        if len(faces) > 0:
+            return "face"
+        else:
+            return "not face"