Test issue 407 (video has a valid fps after concatenate function) (#443)

tests/test_issues.py

@@ -23,18 +23,33 @@ def download_youtube_video(url, filename):
 
 
 def test_download_media(capsys):
+    global knights, knights10
+
     with capsys.disabled():
        download_youtube_video("zvCvOC2VwDc", "media/knights.mp4")
 
     knights=VideoFileClip("media/knights.mp4")
     knights10 = knights.subclip(60,70)
 
 
-
 def test_issue_145():
     with pytest.raises(Exception, message="Expecting Exception"):
          _final = concatenation([knights10], method = 'composite')
 
+def test_issue_407():
+    assert round(knights.fps) == 30
+    assert knights10.fps == knights.fps
+
+    _text=TextClip("blah").set_duration(2)  #TextClip has no fps attribute
+
+    _video=concatenate_videoclips([_text, knights10, knights10])
+    assert _video.fps == knights10.fps
+
+    # uncomment when PR 416 is merged.
+    #_video=concatenate_videoclips([_text])
+    #assert _video.fps == None
+
+
 def test_PR_306():
     assert TextClip.list('font') != []
     assert TextClip.list('color') != []