r, err := NewReader(context.Background(), src, size, md5Hex, sha256Hex, actualSize)
	if err != nil {
		t.Fatal(err)
	}
	return r
}

// Tests NewReader() constructor with invalid arguments.
func TestHashReaderInvalidArguments(t *testing.T) {
	testCases := []struct {
		desc              string
		src               io.Reader
		size              int64
		actualSize        int64
		md5hex, sha256hex string