ddraw/tests: Add a IDirect3DDevice7 GetCaps test.

dlls/ddraw/device.c

@@ -459,6 +459,12 @@ IDirect3DDeviceImpl_7_GetCaps(IDirect3DDevice7 *iface,
 
     TRACE("iface %p, device_desc %p.\n", iface, Desc);
 
+    if (!Desc)
+    {
+        WARN("Desc is NULL, returning DDERR_INVALIDPARAMS.\n");
+        return DDERR_INVALIDPARAMS;
+    }
+
     /* Call the same function used by IDirect3D, this saves code */
     return IDirect3DImpl_GetCaps(This->ddraw->wined3d, &OldDesc, Desc);
 }

dlls/ddraw/tests/d3d.c

@@ -4980,6 +4980,21 @@ static void test_get_caps1(void)
     ok(hr == D3D_OK, "GetCaps with different sizes returned hr %#x, expected D3D_OK.\n", hr);
 }
 
+static void test_get_caps7(void)
+{
+    HRESULT hr;
+    D3DDEVICEDESC7 desc;
+
+    hr = IDirect3DDevice7_GetCaps(lpD3DDevice, NULL);
+    ok(hr == DDERR_INVALIDPARAMS, "IDirect3DDevice7::GetCaps(NULL) returned hr %#x, expected INVALIDPARAMS.\n", hr);
+
+    memset(&desc, 0, sizeof(desc));
+    hr = IDirect3DDevice7_GetCaps(lpD3DDevice, &desc);
+    ok(hr == D3D_OK, "IDirect3DDevice7::GetCaps(non-NULL) returned hr %#x, expected D3D_OK.\n", hr);
+
+    /* There's no dwSize in D3DDEVICEDESC7 */
+}
+
 START_TEST(d3d)
 {
     init_function_pointers();
@@ -5007,6 +5022,7 @@ START_TEST(d3d)
         SetRenderTargetTest();
         VertexBufferLockRest();
         z_format_test();
+        test_get_caps7();
         ReleaseDirect3D();
     }