Better tests (check that response match the structure) (#52)

Trailing zeros were removed from time in responses because of json marshaling features

ozon/utils.go

@@ -0,0 +1,83 @@
+package ozon
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"reflect"
+	"strings"
+	"testing"
+)
+
+func compareJsonResponse(t *testing.T, expectedJSON string, response interface{}) {
+	err := json.Unmarshal([]byte(expectedJSON), response)
+	if err != nil {
+		t.Errorf("got error: %s", err)
+		return
+	}
+
+	after, err := json.Marshal(response)
+	if err != nil {
+		t.Errorf("got error: %s", err)
+		return
+	}
+
+	var j1, j2 map[string]interface{}
+	if err := json.NewDecoder(strings.NewReader(expectedJSON)).Decode(&j1); err != nil {
+		t.Errorf("got error: %s", err)
+		return
+	}
+	if err := json.NewDecoder(bytes.NewReader(after)).Decode(&j2); err != nil {
+		t.Errorf("got error: %s", err)
+		return
+	}
+
+	if err := compareJson(j1, j2, ""); err != nil {
+		t.Errorf("jsons are not equal: %s", err)
+		return
+	}
+}
+
+func compareJson(expected interface{}, actual interface{}, prefix string) error {
+	if expected == nil {
+		return nil
+	}
+
+	expectedType := reflect.TypeOf(expected).Kind()
+	actualType := reflect.TypeOf(actual).Kind()
+	if expectedType != actualType {
+		return fmt.Errorf("type for key %s is different: expected: %s, \ngot: %s", prefix, expectedType, actualType)
+	}
+
+	switch expected.(type) {
+	case map[string]interface{}:
+		expectedMap := expected.(map[string]interface{})
+		actualMap := actual.(map[string]interface{})
+		for k, v := range expectedMap {
+			key := fmt.Sprintf("%s.%s", prefix, k)
+
+			actualValue, ok := actualMap[k]
+			if !ok {
+				return fmt.Errorf("key %s is absent", key)
+			}
+			if err := compareJson(v, actualValue, key); err != nil {
+				return err
+			}
+		}
+	case []interface{}:
+		expectedSlice := expected.([]interface{})
+		actualSlice := actual.([]interface{})
+		for i := range expectedSlice {
+			key := fmt.Sprintf("%s.%d", prefix, i)
+			if err := compareJson(expectedSlice[i], actualSlice[i], key); err != nil {
+				return err
+			}
+		}
+	default:
+		if !reflect.DeepEqual(expected, actual) {
+			return fmt.Errorf("value for key %s is different: expected: %s, \ngot: %s", prefix, expected, actual)
+		}
+	}
+
+	return nil
+}