diff --git a/dlls/quartz/tests/avidec.c b/dlls/quartz/tests/avidec.c
index f008fe10eaf..5b858042f20 100644
--- a/dlls/quartz/tests/avidec.c
+++ b/dlls/quartz/tests/avidec.c
@@ -31,6 +31,13 @@ static IBaseFilter *create_avi_dec(void)
     return filter;
 }
 
+static ULONG get_refcount(void *iface)
+{
+    IUnknown *unknown = iface;
+    IUnknown_AddRef(unknown);
+    return IUnknown_Release(unknown);
+}
+
 #define check_interface(a, b, c) check_interface_(__LINE__, a, b, c)
 static void check_interface_(unsigned int line, void *iface_ptr, REFIID iid, BOOL supported)
 {
@@ -71,11 +78,139 @@ static void test_interfaces(void)
     IBaseFilter_Release(filter);
 }
 
+static void test_enum_pins(void)
+{
+    IBaseFilter *filter = create_avi_dec();
+    IEnumPins *enum1, *enum2;
+    ULONG count, ref;
+    IPin *pins[3];
+    HRESULT hr;
+
+    ref = get_refcount(filter);
+    ok(ref == 1, "Got unexpected refcount %d.\n", ref);
+
+    hr = IBaseFilter_EnumPins(filter, NULL);
+    ok(hr == E_POINTER, "Got hr %#x.\n", hr);
+
+    hr = IBaseFilter_EnumPins(filter, &enum1);
+    ok(hr == S_OK, "Got hr %#x.\n", hr);
+    ref = get_refcount(filter);
+    ok(ref == 2, "Got unexpected refcount %d.\n", ref);
+    ref = get_refcount(enum1);
+    ok(ref == 1, "Got unexpected refcount %d.\n", ref);
+
+    hr = IEnumPins_Next(enum1, 1, NULL, NULL);
+    ok(hr == E_POINTER, "Got hr %#x.\n", hr);
+
+    hr = IEnumPins_Next(enum1, 1, pins, NULL);
+    ok(hr == S_OK, "Got hr %#x.\n", hr);
+    ref = get_refcount(filter);
+todo_wine
+    ok(ref == 3, "Got unexpected refcount %d.\n", ref);
+    ref = get_refcount(pins[0]);
+todo_wine
+    ok(ref == 3, "Got unexpected refcount %d.\n", ref);
+    ref = get_refcount(enum1);
+    ok(ref == 1, "Got unexpected refcount %d.\n", ref);
+    IPin_Release(pins[0]);
+    ref = get_refcount(filter);
+    ok(ref == 2, "Got unexpected refcount %d.\n", ref);
+
+    hr = IEnumPins_Next(enum1, 1, pins, NULL);
+    ok(hr == S_OK, "Got hr %#x.\n", hr);
+    ref = get_refcount(filter);
+todo_wine
+    ok(ref == 3, "Got unexpected refcount %d.\n", ref);
+    ref = get_refcount(pins[0]);
+todo_wine
+    ok(ref == 3, "Got unexpected refcount %d.\n", ref);
+    ref = get_refcount(enum1);
+    ok(ref == 1, "Got unexpected refcount %d.\n", ref);
+    IPin_Release(pins[0]);
+    ref = get_refcount(filter);
+    ok(ref == 2, "Got unexpected refcount %d.\n", ref);
+
+    hr = IEnumPins_Next(enum1, 1, pins, NULL);
+    ok(hr == S_FALSE, "Got hr %#x.\n", hr);
+
+    hr = IEnumPins_Reset(enum1);
+    ok(hr == S_OK, "Got hr %#x.\n", hr);
+
+    hr = IEnumPins_Next(enum1, 1, pins, &count);
+    ok(hr == S_OK, "Got hr %#x.\n", hr);
+    ok(count == 1, "Got count %u.\n", count);
+    IPin_Release(pins[0]);
+
+    hr = IEnumPins_Next(enum1, 1, pins, &count);
+    ok(hr == S_OK, "Got hr %#x.\n", hr);
+    ok(count == 1, "Got count %u.\n", count);
+    IPin_Release(pins[0]);
+
+    hr = IEnumPins_Next(enum1, 1, pins, &count);
+    ok(hr == S_FALSE, "Got hr %#x.\n", hr);
+    ok(!count, "Got count %u.\n", count);
+
+    hr = IEnumPins_Reset(enum1);
+    ok(hr == S_OK, "Got hr %#x.\n", hr);
+
+    hr = IEnumPins_Next(enum1, 2, pins, NULL);
+    ok(hr == E_INVALIDARG, "Got hr %#x.\n", hr);
+
+    hr = IEnumPins_Next(enum1, 2, pins, &count);
+    ok(hr == S_OK, "Got hr %#x.\n", hr);
+    ok(count == 2, "Got count %u.\n", count);
+    IPin_Release(pins[0]);
+    IPin_Release(pins[1]);
+
+    hr = IEnumPins_Next(enum1, 2, pins, &count);
+    ok(hr == S_FALSE, "Got hr %#x.\n", hr);
+    ok(!count, "Got count %u.\n", count);
+
+    hr = IEnumPins_Reset(enum1);
+    ok(hr == S_OK, "Got hr %#x.\n", hr);
+
+    hr = IEnumPins_Next(enum1, 3, pins, &count);
+    ok(hr == S_FALSE, "Got hr %#x.\n", hr);
+    ok(count == 2, "Got count %u.\n", count);
+    IPin_Release(pins[0]);
+    IPin_Release(pins[1]);
+
+    hr = IEnumPins_Reset(enum1);
+    ok(hr == S_OK, "Got hr %#x.\n", hr);
+
+    hr = IEnumPins_Clone(enum1, &enum2);
+    ok(hr == S_OK, "Got hr %#x.\n", hr);
+
+    hr = IEnumPins_Skip(enum1, 3);
+todo_wine
+    ok(hr == S_FALSE, "Got hr %#x.\n", hr);
+
+    hr = IEnumPins_Skip(enum1, 2);
+todo_wine
+    ok(hr == S_OK, "Got hr %#x.\n", hr);
+
+    hr = IEnumPins_Skip(enum1, 1);
+    ok(hr == S_FALSE, "Got hr %#x.\n", hr);
+
+    hr = IEnumPins_Next(enum1, 1, pins, NULL);
+    ok(hr == S_FALSE, "Got hr %#x.\n", hr);
+
+    hr = IEnumPins_Next(enum2, 1, pins, NULL);
+    ok(hr == S_OK, "Got hr %#x.\n", hr);
+    IPin_Release(pins[0]);
+
+    IEnumPins_Release(enum2);
+    IEnumPins_Release(enum1);
+    ref = IBaseFilter_Release(filter);
+    ok(!ref, "Got outstanding refcount %d.\n", ref);
+}
+
 START_TEST(avidec)
 {
     CoInitialize(NULL);
 
     test_interfaces();
+    test_enum_pins();
 
     CoUninitialize();
 }