qcap/tests: Add some tests for IBaseFilter::FindPin() on the AVI mux filter.

dlls/qcap/tests/avimux.c

@@ -23,6 +23,9 @@
 #include "vfw.h"
 #include "wine/test.h"
 
+static const WCHAR source_id[] = {'A','V','I',' ','O','u','t',0};
+static const WCHAR sink0_id[] = {'I','n','p','u','t',' ','0','1',0};
+
 static const GUID testguid = {0xfacade};
 
 static IBaseFilter *create_avi_mux(void)
@@ -300,6 +303,38 @@ static void test_enum_pins(void)
     ok(!ref, "Got outstanding refcount %d.\n", ref);
 }
 
+static void test_find_pin(void)
+{
+    IBaseFilter *filter = create_avi_mux();
+    IEnumPins *enum_pins;
+    IPin *pin, *pin2;
+    HRESULT hr;
+    ULONG ref;
+
+    hr = IBaseFilter_EnumPins(filter, &enum_pins);
+    ok(hr == S_OK, "Got hr %#x.\n", hr);
+
+    hr = IBaseFilter_FindPin(filter, source_id, &pin);
+    ok(hr == S_OK, "Got hr %#x.\n", hr);
+    hr = IEnumPins_Next(enum_pins, 1, &pin2, NULL);
+    ok(hr == S_OK, "Got hr %#x.\n", hr);
+    ok(pin == pin2, "Pins didn't match.\n");
+    IPin_Release(pin);
+    IPin_Release(pin2);
+
+    hr = IBaseFilter_FindPin(filter, sink0_id, &pin);
+    ok(hr == S_OK, "Got hr %#x.\n", hr);
+    hr = IEnumPins_Next(enum_pins, 1, &pin2, NULL);
+    ok(hr == S_OK, "Got hr %#x.\n", hr);
+    ok(pin == pin2, "Pins didn't match.\n");
+    IPin_Release(pin);
+    IPin_Release(pin2);
+
+    IEnumPins_Release(enum_pins);
+    ref = IBaseFilter_Release(filter);
+    ok(!ref, "Got outstanding refcount %d.\n", ref);
+}
+
 static void test_seeking(void)
 {
     IBaseFilter *filter = create_avi_mux();
@@ -441,6 +476,7 @@ START_TEST(avimux)
     test_interfaces();
     test_aggregation();
     test_enum_pins();
+    test_find_pin();
     test_seeking();
 
     CoUninitialize();