Implement signed data calculating function from SignedDataReader

service/utils_test.go

@@ -0,0 +1,34 @@
+package service
+
+import (
+	"testing"
+
+	"github.com/pkg/errors"
+	"github.com/stretchr/testify/require"
+)
+
+func TestSignedDataFromReader(t *testing.T) {
+	// nil SignedDataReader
+	_, err := SignedDataFromReader(nil)
+	require.EqualError(t, err, ErrNilSignedDataReader.Error())
+
+	rdr := &testSignedDataReader{
+		testSignedDataSrc: new(testSignedDataSrc),
+	}
+
+	// make reader to return an error
+	rdr.err = errors.New("test error")
+
+	_, err = SignedDataFromReader(rdr)
+	require.EqualError(t, err, rdr.err.Error())
+
+	// remove the error
+	rdr.err = nil
+
+	// fill the data
+	rdr.data = testData(t, 10)
+
+	res, err := SignedDataFromReader(rdr)
+	require.NoError(t, err)
+	require.Equal(t, rdr.data, res)
+}