quartz/tests: Add some tests for flushing on the DirectSound renderer.

dlls/quartz/tests/dsoundrender.c

@@ -832,6 +832,51 @@ static void test_filter_state(IMemInputPin *input, IMediaControl *control)
      * completely paused. */
 }
 
+static void test_flushing(IPin *pin, IMemInputPin *input, IMediaControl *control)
+{
+    OAFilterState state;
+    HRESULT hr;
+
+    hr = IMediaControl_Pause(control);
+    ok(hr == S_FALSE, "Got hr %#x.\n", hr);
+
+    hr = send_frame(input);
+    todo_wine ok(hr == S_OK, "Got hr %#x.\n", hr);
+
+    hr = IMediaControl_GetState(control, 0, &state);
+    ok(hr == S_OK, "Got hr %#x.\n", hr);
+
+    hr = IPin_BeginFlush(pin);
+    ok(hr == S_OK, "Got hr %#x.\n", hr);
+
+    hr = send_frame(input);
+    ok(hr == S_FALSE, "Got hr %#x.\n", hr);
+
+    hr = IPin_EndFlush(pin);
+    ok(hr == S_OK, "Got hr %#x.\n", hr);
+
+    hr = IMediaControl_GetState(control, 0, &state);
+    ok(hr == S_OK, "Got hr %#x.\n", hr);
+
+    hr = IMediaControl_Run(control);
+    ok(hr == S_OK, "Got hr %#x.\n", hr);
+
+    hr = IPin_BeginFlush(pin);
+    ok(hr == S_OK, "Got hr %#x.\n", hr);
+
+    hr = send_frame(input);
+    ok(hr == S_FALSE, "Got hr %#x.\n", hr);
+
+    hr = IPin_EndFlush(pin);
+    ok(hr == S_OK, "Got hr %#x.\n", hr);
+
+    hr = send_frame(input);
+    ok(hr == S_OK, "Got hr %#x.\n", hr);
+
+    hr = IMediaControl_Stop(control);
+    ok(hr == S_OK, "Got hr %#x.\n", hr);
+}
+
 static void test_connect_pin(void)
 {
     ALLOCATOR_PROPERTIES req_props = {1, 4 * 44100, 1, 0}, ret_props;
@@ -925,6 +970,7 @@ static void test_connect_pin(void)
     ok(hr == S_OK, "Got hr %#x.\n", hr);
 
     test_filter_state(input, control);
+    test_flushing(pin, input, control);
 
     hr = IFilterGraph2_Disconnect(graph, pin);
     ok(hr == S_OK, "Got hr %#x.\n", hr);