Tidy up logging and rework tests from scratch

tests/legacy/disposition_combinator_3_4.py

@@ -0,0 +1,46 @@
+import os, sys, importlib, glob, inspect
+
+from ffx.track_disposition import TrackDisposition
+from .disposition_combinator_3 import DispositionCombinator3
+
+
+class DispositionCombinator34(DispositionCombinator3):
+
+    VARIANT = 'D101'
+
+
+    def __init__(self, context = None,
+                    createPresets: bool = False):
+        super().__init__(context)
+
+        self.__createPresets = createPresets
+
+    def getVariant(self):
+        return DispositionCombinator34.VARIANT
+
+
+    def getPayload(self):
+
+        subtrack0 = set([TrackDisposition.DEFAULT])
+        subtrack1 = set()
+        subtrack2 = set([TrackDisposition.DEFAULT])
+
+        #NOTE: Current ffmpeg version will not set most of the dispositions on arbitrary tracks
+        # so some checks for preserved dispositions are omitted for now
+        if self.__createPresets:
+            subtrack0.add(TrackDisposition.FORCED) # COMMENT
+            # subtrack1.add(TrackDisposition.DESCRIPTIONS) # DESCRIPTIONS
+            # subtrack2.add(TrackDisposition.HEARING_IMPAIRED) # HEARING_IMPAIRED
+
+        return (subtrack0,
+                subtrack1,
+                subtrack2)
+
+    #TODO: tmpdb cases
+    def createAssertFunc(self):
+        def f(assertObj: dict = {}):
+            pass
+        return f
+
+    def shouldFail(self):
+        return True