diff --git a/filter_graph_test.go b/filter_graph_test.go
index 0f1b533..4cd7382 100644
--- a/filter_graph_test.go
+++ b/filter_graph_test.go
@@ -194,6 +194,14 @@ func TestFilterGraph(t *testing.T) {
 			outputs = o
 		}
 
+		require.Equal(t, len(buffersrcContexts)+1, fg.NbFilters())
+		fs := fg.Filters()
+		require.Equal(t, len(buffersrcContexts)+1, len(fs))
+		require.Equal(t, buffersinkContext.FilterContext(), fs[0])
+		for idx, c := range fs[1:] {
+			require.Equal(t, buffersrcContexts[idx].FilterContext(), c)
+		}
+
 		require.NoError(t, fg.Parse(v.content, inputs, outputs))
 		require.NoError(t, fg.Configure())
 
@@ -247,43 +255,6 @@ func TestFilterGraph(t *testing.T) {
 	require.Equal(t, 1, len(os))
 	require.Equal(t, MediaTypeAudio, os[0].MediaType())
 
-	fg3 := AllocFilterGraph()
-	require.NotNil(t, fg3)
-	defer fg3.Free()
-	outputs := AllocFilterInOut()
-	br := FindFilterByName("buffer")
-	brCtx, err := fg3.NewBuffersrcFilterContext(br, "in")
-	require.NoError(t, err)
-	brCtxParameters := AllocBuffersrcFilterContextParameters()
-	brCtxParameters.SetPixelFormat(PixelFormatYuv420P)
-	brCtxParameters.SetSampleAspectRatio(NewRational(1, 1))
-	brCtxParameters.SetWidth(1080)
-	brCtxParameters.SetHeight(720)
-	brCtxParameters.SetTimeBase(NewRational(1, 30))
-	err = brCtx.SetParameters(brCtxParameters)
-	require.NoError(t, err)
-	err = brCtx.Initialize(nil)
-	require.NoError(t, err)
-	outputs.SetName("in")
-	outputs.SetFilterContext(brCtx.FilterContext())
-	outputs.SetPadIdx(0)
-	outputs.SetNext(nil)
-	inputs := AllocFilterInOut()
-	bs := FindFilterByName("buffersink")
-	bsCtx, err := fg3.NewBuffersinkFilterContext(bs, "out")
-	require.NoError(t, err)
-	inputs.SetName("out")
-	inputs.SetFilterContext(bsCtx.FilterContext())
-	inputs.SetPadIdx(0)
-	inputs.SetNext(nil)
-	err = fg3.Parse("movie=filename=testdata/video.mp4[mv];[in][mv]overlay=x=100:y=100[ol];[ol]scale=w=1080:h=720[out]", outputs, inputs)
-	require.NoError(t, err)
-	var filterNames string
-	for _, filterContext := range fg3.Filters() {
-		filterNames += fmt.Sprintf("[%s]", filterContext.Class().ItemName())
-	}
-	require.Equal(t, "[in][out][Parsed_movie_0][Parsed_overlay_1][Parsed_scale_2]", filterNames)
-
 	// TODO Test BuffersrcAddFrame
 	// TODO Test BuffersinkGetFrame
 }