Add error test

Author: osamingo

error_test.go

@@ -0,0 +1,36 @@
+package gaurun
+
+import (
+	"bytes"
+	"io/ioutil"
+	"net/http"
+	"testing"
+)
+
+func TestNewError(t *testing.T) {
+	tbl := []struct {
+		Response *http.Response
+		Expected string
+	}{
+		{
+			Response: &http.Response{
+				StatusCode: http.StatusBadRequest,
+				Body:       ioutil.NopCloser(bytes.NewBufferString("{")),
+			},
+			Expected: "gaurun: failed to decode http response: unexpected EOF",
+		},
+		{
+			Response: &http.Response{
+				StatusCode: http.StatusBadRequest,
+				Body:       ioutil.NopCloser(bytes.NewBufferString(`{"message":"empty notification"}`)),
+			},
+			Expected: "gaurun: an error occurred - status_code = 400, response = {Message:empty notification}",
+		},
+	}
+	for i := range tbl {
+		err := NewError(tbl[i].Response)
+		if tbl[i].Expected != err.Error() {
+			t.Errorf("failed to test - expected = %s, actual = %s", tbl[i].Expected, err.Error())
+		}
+	}
+}