diff --git a/dlls/mfplat/tests/mfplat.c b/dlls/mfplat/tests/mfplat.c
index fdfcf8a5d4b..879240ae1a4 100644
--- a/dlls/mfplat/tests/mfplat.c
+++ b/dlls/mfplat/tests/mfplat.c
@@ -93,6 +93,109 @@ static void check_interface_(unsigned int line, void *iface_ptr, REFIID iid, BOO
         IUnknown_Release(unk);
 }
 
+struct d3d11_resource_readback
+{
+    ID3D11Resource *resource;
+    D3D11_MAPPED_SUBRESOURCE map_desc;
+    ID3D11DeviceContext *immediate_context;
+    unsigned int width, height, depth, sub_resource_idx;
+};
+
+static void init_d3d11_resource_readback(ID3D11Resource *resource, ID3D11Resource *readback_resource,
+        unsigned int width, unsigned int height, unsigned int depth, unsigned int sub_resource_idx,
+        ID3D11Device *device, struct d3d11_resource_readback *rb)
+{
+    HRESULT hr;
+
+    rb->resource = readback_resource;
+    rb->width = width;
+    rb->height = height;
+    rb->depth = depth;
+    rb->sub_resource_idx = sub_resource_idx;
+
+    ID3D11Device_GetImmediateContext(device, &rb->immediate_context);
+
+    ID3D11DeviceContext_CopyResource(rb->immediate_context, rb->resource, resource);
+    if (FAILED(hr = ID3D11DeviceContext_Map(rb->immediate_context,
+            rb->resource, sub_resource_idx, D3D11_MAP_READ, 0, &rb->map_desc)))
+    {
+        trace("Failed to map resource, hr %#x.\n", hr);
+        ID3D11Resource_Release(rb->resource);
+        rb->resource = NULL;
+        ID3D11DeviceContext_Release(rb->immediate_context);
+        rb->immediate_context = NULL;
+    }
+}
+
+static void get_d3d11_texture2d_readback(ID3D11Texture2D *texture, unsigned int sub_resource_idx,
+        struct d3d11_resource_readback *rb)
+{
+    D3D11_TEXTURE2D_DESC texture_desc;
+    ID3D11Resource *rb_texture;
+    unsigned int miplevel;
+    ID3D11Device *device;
+    HRESULT hr;
+
+    memset(rb, 0, sizeof(*rb));
+
+    ID3D11Texture2D_GetDevice(texture, &device);
+
+    ID3D11Texture2D_GetDesc(texture, &texture_desc);
+    texture_desc.Usage = D3D11_USAGE_STAGING;
+    texture_desc.BindFlags = 0;
+    texture_desc.CPUAccessFlags = D3D11_CPU_ACCESS_READ;
+    texture_desc.MiscFlags = 0;
+    if (FAILED(hr = ID3D11Device_CreateTexture2D(device, &texture_desc, NULL, (ID3D11Texture2D **)&rb_texture)))
+    {
+        trace("Failed to create texture, hr %#x.\n", hr);
+        ID3D11Device_Release(device);
+        return;
+    }
+
+    miplevel = sub_resource_idx % texture_desc.MipLevels;
+    init_d3d11_resource_readback((ID3D11Resource *)texture, rb_texture,
+            max(1, texture_desc.Width >> miplevel),
+            max(1, texture_desc.Height >> miplevel),
+            1, sub_resource_idx, device, rb);
+
+    ID3D11Device_Release(device);
+}
+
+static void release_d3d11_resource_readback(struct d3d11_resource_readback *rb)
+{
+    ID3D11DeviceContext_Unmap(rb->immediate_context, rb->resource, rb->sub_resource_idx);
+    ID3D11Resource_Release(rb->resource);
+    ID3D11DeviceContext_Release(rb->immediate_context);
+}
+
+static void *get_d3d11_readback_data(struct d3d11_resource_readback *rb,
+        unsigned int x, unsigned int y, unsigned int z, unsigned byte_width)
+{
+    return (BYTE *)rb->map_desc.pData + z * rb->map_desc.DepthPitch + y * rb->map_desc.RowPitch + x * byte_width;
+}
+
+static DWORD get_d3d11_readback_u32(struct d3d11_resource_readback *rb, unsigned int x, unsigned int y, unsigned int z)
+{
+    return *(DWORD *)get_d3d11_readback_data(rb, x, y, z, sizeof(DWORD));
+}
+
+static DWORD get_d3d11_readback_color(struct d3d11_resource_readback *rb, unsigned int x, unsigned int y, unsigned int z)
+{
+    return get_d3d11_readback_u32(rb, x, y, z);
+}
+
+static DWORD get_d3d11_texture_color(ID3D11Texture2D *texture, unsigned int x, unsigned int y)
+{
+    struct d3d11_resource_readback rb;
+    DWORD color;
+
+    get_d3d11_texture2d_readback(texture, 0, &rb);
+    color = get_d3d11_readback_color(&rb, x, y, 0);
+    release_d3d11_resource_readback(&rb);
+
+    return color;
+}
+
 static HRESULT (WINAPI *pD3D11CreateDevice)(IDXGIAdapter *adapter, D3D_DRIVER_TYPE driver_type, HMODULE swrast, UINT flags,
         const D3D_FEATURE_LEVEL *feature_levels, UINT levels, UINT sdk_version, ID3D11Device **device_out,
         D3D_FEATURE_LEVEL *obtained_feature_level, ID3D11DeviceContext **immediate_context);
@@ -6201,6 +6304,7 @@ static ID3D11Device *create_d3d11_device(void)
 
 static void test_dxgi_surface_buffer(void)
 {
+    DWORD max_length, cur_length, color;
     IMFDXGIBuffer *dxgi_buffer;
     D3D11_TEXTURE2D_DESC desc;
     ID3D11Texture2D *texture;
@@ -6280,6 +6384,40 @@ static void test_dxgi_surface_buffer(void)
 
     IMFDXGIBuffer_Release(dxgi_buffer);
 
+    /* Texture updates. */
+    color = get_d3d11_texture_color(texture, 0, 0);
+    ok(!color, "Unexpected texture color %#x.\n", color);
+
+    max_length = cur_length = 0;
+    data = NULL;
+    hr = IMFMediaBuffer_Lock(buffer, &data, &max_length, &cur_length);
+todo_wine {
+    ok(hr == S_OK, "Unexpected hr %#x.\n", hr);
+    ok(max_length && max_length == cur_length, "Unexpected length %u.\n", max_length);
+}
+    if (data) *(DWORD *)data = ~0u;
+
+    color = get_d3d11_texture_color(texture, 0, 0);
+    ok(!color, "Unexpected texture color %#x.\n", color);
+
+    hr = IMFMediaBuffer_Unlock(buffer);
+todo_wine
+    ok(hr == S_OK, "Unexpected hr %#x.\n", hr);
+
+    color = get_d3d11_texture_color(texture, 0, 0);
+todo_wine
+    ok(color == ~0u, "Unexpected texture color %#x.\n", color);
+
+    hr = IMFMediaBuffer_Lock(buffer, &data, &max_length, &cur_length);
+todo_wine
+    ok(hr == S_OK, "Unexpected hr %#x.\n", hr);
+    if (SUCCEEDED(hr))
+        ok(*(DWORD *)data == ~0u, "Unexpected buffer %#x.\n", *(DWORD *)data);
+
+    hr = IMFMediaBuffer_Unlock(buffer);
+todo_wine
+    ok(hr == S_OK, "Unexpected hr %#x.\n", hr);
+
     IMFMediaBuffer_Release(buffer);
 
     ID3D11Texture2D_Release(texture);