{bucketName: "unused-bucket", objName: "def", uploadID: "xyz", PartID: 1, expectedError: fmt.Errorf("%s", "Invalid upload id xyz")},
		// Test Case - 8.
		// Existing bucket, object name different from which NewMultipartUpload is constructed from.
		// Expecting "Invalid upload id".
		{bucketName: bucket, objName: "def", uploadID: "xyz", PartID: 1, expectedError: fmt.Errorf("%s", "Invalid upload id xyz")},
		// Test Case - 9.

		t.Fatalf("Unable to create file, %s", err)
	}
	if err = xlStorage.AppendFile(context.Background(), "success-vol", "abc/xyz/ghi/success-file", []byte("Hello, world")); err != nil {
		t.Fatalf("Unable to create file, %s", err)
	}

	testCases := []struct {
		srcVol  string
		srcPath string
		// expected result.