makes more explicit error message for an example json matcher

examples/api/api_test.go

@@ -60,9 +60,18 @@ func (a *apiFeature) theResponseShouldMatchJSON(body *gherkin.DocString) (err er
 	if expected, err = json.Marshal(data); err != nil {
 		return
 	}
-	actual = a.resp.Body.Bytes()
+	actual = bytes.TrimSpace(a.resp.Body.Bytes())
-	if !bytes.Equal(actual, expected) {
+	if len(actual) != len(expected) {
-		err = fmt.Errorf("expected json, does not match actual: %s", string(actual))
+		return fmt.Errorf("expected json length: %d does not match actual: %d", len(expected), len(actual))
+	}
+	for i, b := range actual {
+		if b != expected[i] {
+			return fmt.Errorf(
+				"expected json does not match actual at character: %s^%s",
+				string(actual[:i]),
+				string(actual[i:i+1]),
+			)
+		}
 	}
 	return
 }

examples/api/version.feature

@@ -20,6 +20,6 @@ Feature: get version
     And the response should match json:
       """
       {
-        "version": "v0.6.1"
+        "version": "v0.6.3"
       }
       """