add test utils

utils/test.go

@@ -0,0 +1,76 @@
+package utils
+
+import (
+	"bytes"
+	"encoding/json"
+	"errors"
+	"fmt"
+
+	"github.com/sergi/go-diff/diffmatchpatch"
+)
+
+func CompareJSONDecode(j string, v interface{}) error {
+	bytes, errCompact := CompactJSON(j)
+	if errCompact != nil {
+		return errCompact
+	}
+	// Unmarshal the data
+	json.Unmarshal(bytes, v)
+
+	// Marshal it again
+	outputData, _ := json.Marshal(v)
+
+	old := string(bytes)
+	new := string(outputData)
+
+	return DiffStrings(old, new)
+}
+
+func CompareStructToJSON(v interface{}, j string) error {
+	// Remove all extra spaces from json string
+	bytes, errCompact := CompactJSON(j)
+	if errCompact != nil {
+		return errCompact
+	}
+
+	newData, errMarsh := json.Marshal(v)
+	if errMarsh != nil {
+		return errMarsh
+	}
+
+	old := string(bytes)
+	new := string(newData)
+	return DiffStrings(old, new)
+}
+
+func DiffStrings(s1, s2 string) error {
+	if s1 != s2 {
+		fmt.Println("String do not match!")
+		fmt.Println("OLD: \n " + s1)
+		fmt.Println("----------------------------- ")
+		fmt.Println("NEW: \n " + s2)
+		fmt.Println("----------------------------- ")
+		fmt.Println("DIFF:")
+
+		dmp := diffmatchpatch.New()
+
+		diffs := dmp.DiffMain(s1, s2, true)
+
+		fmt.Println(dmp.DiffPrettyText(diffs))
+		return errors.New("output is not the same as input")
+	}
+	return nil
+}
+
+func CompactJSON(j string) ([]byte, error) {
+
+	buffer := new(bytes.Buffer)
+	// Remove all spaces
+	errCompact := json.Compact(buffer, []byte(j))
+	if errCompact != nil {
+		return nil, errCompact
+	}
+	bytes := buffer.Bytes()
+
+	return bytes, nil
+}