d3d11/tests: Port test_device_removed_reason() from d3d10core.

dlls/d3d11/tests/d3d11.c

@@ -1612,6 +1612,27 @@ static void test_create_rasterizer_state(void)
     ok(!refcount, "Device has %u references left.\n", refcount);
 }
 
+static void test_device_removed_reason(void)
+{
+    ID3D11Device *device;
+    ULONG refcount;
+    HRESULT hr;
+
+    if (!(device = create_device(NULL)))
+    {
+        skip("Failed to create device.\n");
+        return;
+    }
+
+    hr = ID3D11Device_GetDeviceRemovedReason(device);
+    ok(hr == S_OK, "Got unexpected hr %#x.\n", hr);
+    hr = ID3D11Device_GetDeviceRemovedReason(device);
+    ok(hr == S_OK, "Got unexpected hr %#x.\n", hr);
+
+    refcount = ID3D11Device_Release(device);
+    ok(!refcount, "Device has %u references left.\n", refcount);
+}
+
 START_TEST(d3d11)
 {
     test_create_device();
@@ -1628,4 +1649,5 @@ START_TEST(d3d11)
     test_create_shader();
     test_create_depthstencil_state();
     test_create_rasterizer_state();
+    test_device_removed_reason();
 }