adds aa filter to deinterlacer

tests/unit/test_deinterlace_filter.py

@@ -0,0 +1,64 @@
+import unittest
+
+from ffx.cli import convert
+from ffx.filter.deinterlace_filter import DeinterlaceFilter
+from ffx.filter.filter import Filter
+
+
+class DeinterlaceFilterTest(unittest.TestCase):
+
+    def setUp(self):
+        Filter.filterChain.clear()
+
+    def tearDown(self):
+        Filter.filterChain.clear()
+
+    def getPayload(self, mode=DeinterlaceFilter.DEFAULT_MODE):
+        deinterlaceFilter = DeinterlaceFilter(mode=mode)
+        payload, = deinterlaceFilter.getYield()
+        return payload
+
+    def test_default_mode_yields_only_bwdif(self):
+        payload = self.getPayload()
+
+        self.assertEqual(['bwdif=mode=1'], payload['tokens'])
+
+    def test_up_down_mode_yields_lanczos_scales_after_bwdif(self):
+        payload = self.getPayload(DeinterlaceFilter.UP_DOWN_MODE)
+
+        self.assertEqual(
+            [
+                'bwdif=mode=1',
+                'scale=iw*2:ih*2:flags=lanczos',
+                'scale=iw/2:ih/2:flags=lanczos',
+            ],
+            payload['tokens'],
+        )
+
+    def test_hq_denoise_mode_yields_hqdn3d_after_bwdif(self):
+        payload = self.getPayload(DeinterlaceFilter.HQ_DENOISE_MODE)
+
+        self.assertEqual(
+            ['bwdif=mode=1', 'hqdn3d=1.5:1.5:3:3'],
+            payload['tokens'],
+        )
+
+    def test_unknown_mode_is_rejected(self):
+        with self.assertRaisesRegex(ValueError, 'Unknown deinterlace mode: other'):
+            DeinterlaceFilter(mode='other')
+
+    def test_cli_accepts_named_modes_and_preserves_bare_flag_behavior(self):
+        upDownContext = convert.make_context(
+            'convert',
+            ['--deinterlace', 'up_down'],
+        )
+        bareFlagContext = convert.make_context('convert', ['--deinterlace'])
+        omittedContext = convert.make_context('convert', [])
+
+        self.assertEqual('up_down', upDownContext.params['deinterlace'])
+        self.assertEqual('default', bareFlagContext.params['deinterlace'])
+        self.assertEqual('none', omittedContext.params['deinterlace'])
+
+
+if __name__ == '__main__':
+    unittest.main()