Added tests for validation function

internal/configuration/helpers_internal.go → internal/configuration/helpers.go

@@ -3,6 +3,8 @@ package configuration
 import (
 	"errors"
 
+	"github.com/evg4b/uncors/internal/log"
+
 	"github.com/spf13/viper"
 )
 
@@ -23,7 +25,12 @@ func readURLMapping(config *viper.Viper, configuration *UncorsConfig) error {
 	}
 
 	for index, key := range from {
-		configuration.Mappings[key] = to[index]
+		value := to[index]
+		if prev, ok := configuration.Mappings[key]; ok {
+			log.Warningf("Mapping for %s from (%s) replaced new value (%s)", key, prev, value)
+		}
+
+		configuration.Mappings[key] = value
 	}
 
 	return nil

internal/configuration/validation_test.go

@@ -0,0 +1,31 @@
+package configuration_test
+
+import (
+	"testing"
+
+	"github.com/evg4b/uncors/internal/configuration"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestValidate(t *testing.T) {
+	tests := []struct {
+		name     string
+		config   *configuration.UncorsConfig
+		expected string
+	}{
+		{
+			name: "invalid http-port",
+			config: &configuration.UncorsConfig{
+				Mappings: map[string]string{},
+			},
+			expected: "Key: 'UncorsConfig.HTTPPort' Error:Field validation for 'HTTPPort' failed on the 'required' tag",
+		},
+	}
+	for _, testCase := range tests {
+		t.Run(testCase.name, func(t *testing.T) {
+			err := configuration.Validate(testCase.config)
+
+			assert.EqualError(t, err, testCase.expected)
+		})
+	}
+}