diff --git a/dlls/d3dcompiler_43/tests/blob.c b/dlls/d3dcompiler_43/tests/blob.c
index 95982be0f97..1c89238f068 100644
--- a/dlls/d3dcompiler_43/tests/blob.c
+++ b/dlls/d3dcompiler_43/tests/blob.c
@@ -251,6 +251,10 @@ static void test_get_blob_part(void)
     /* D3D_BLOB_PATCH_CONSTANT_SIGNATURE_BLOB */
     hr = D3DGetBlobPart(test_blob_part, test_blob_part[6], D3D_BLOB_PATCH_CONSTANT_SIGNATURE_BLOB, 0, &blob);
     ok(hr == E_FAIL, "D3DGetBlobPart failed, got %x, expected %x\n", hr, E_FAIL);
+
+    /* D3D_BLOB_ALL_SIGNATURE_BLOB */
+    hr = D3DGetBlobPart(test_blob_part, test_blob_part[6], D3D_BLOB_ALL_SIGNATURE_BLOB, 0, &blob);
+    ok(hr == E_FAIL, "D3DGetBlobPart failed, got %x, expected %x\n", hr, E_FAIL);
 }
 
 /*
@@ -478,6 +482,43 @@ static void test_get_blob_part2(void)
 
     refcount = ID3D10Blob_Release(blob);
     ok(!refcount, "ID3DBlob has %u references left\n", refcount);
+
+    /* D3D_BLOB_ALL_SIGNATURE_BLOB */
+    hr = D3DGetBlobPart(test_blob_part2, test_blob_part2[6], D3D_BLOB_ALL_SIGNATURE_BLOB, 0, &blob);
+    ok(hr == S_OK, "D3DGetBlobPart failed, got %x, expected %x\n", hr, S_OK);
+
+    size = ID3D10Blob_GetBufferSize(blob);
+    ok(size == 344, "GetBufferSize failed, got %lu, expected %u\n", size, 344);
+
+    dword = ((DWORD*)ID3D10Blob_GetBufferPointer(blob));
+    ok(TAG_DXBC == *dword, "DXBC got %#x, expected %#x.\n", *dword, TAG_DXBC);
+    ok(TAG_ISGN == *(dword+11), "ISGN got %#x, expected %#x.\n", *(dword+11), TAG_ISGN);
+    ok(TAG_OSGN == *(dword+24), "OSGN got %#x, expected %#x.\n", *(dword+24), TAG_OSGN);
+    ok(TAG_PCSG == *(dword+37), "PCSG got %#x, expected %#x.\n", *(dword+37), TAG_PCSG);
+
+    for (i = 0; i < sizeof(parts) / sizeof(parts[0]); i++)
+    {
+        hr = D3DGetBlobPart(dword, size, parts[i], 0, &blob2);
+
+        if (parts[i] == D3D_BLOB_ALL_SIGNATURE_BLOB
+                || parts[i] == D3D_BLOB_PATCH_CONSTANT_SIGNATURE_BLOB
+                || parts[i] == D3D_BLOB_INPUT_AND_OUTPUT_SIGNATURE_BLOB
+                || parts[i] == D3D_BLOB_INPUT_SIGNATURE_BLOB
+                || parts[i] == D3D_BLOB_OUTPUT_SIGNATURE_BLOB)
+        {
+            ok(hr == S_OK, "D3DGetBlobPart failed, got %x, expected %x\n", hr, S_OK);
+
+            refcount = ID3D10Blob_Release(blob2);
+            ok(!refcount, "ID3DBlob has %u references left\n", refcount);
+        }
+        else
+        {
+            ok(hr == E_FAIL, "D3DGetBlobPart failed, got %x, expected %x\n", hr, E_FAIL);
+        }
+    }
+
+    refcount = ID3D10Blob_Release(blob);
+    ok(!refcount, "ID3DBlob has %u references left\n", refcount);
 }
 
 START_TEST(blob)