rewrite language detection, rewrite tests

pkg/app/app.go

@@ -51,10 +51,7 @@ func NewApp(config config.AppConfigurer) (*App, error) {
 		return app, err
 	}
 
-	app.Tr, err = i18n.NewLocalizer(app.Log)
-	if err != nil {
-		return app, err
-	}
+	app.Tr = i18n.NewLocalizer(app.Log)
 
 	app.GitCommand, err = commands.NewGitCommand(app.Log, app.OSCommand)
 	if err != nil {

pkg/i18n/i18n.go

@@ -18,33 +18,12 @@ type Localizer struct {
 }
 
 // NewLocalizer creates a new Localizer
-func NewLocalizer(log *logrus.Logger) (*Localizer, error) {
+func NewLocalizer(log *logrus.Logger) *Localizer {
+	userLang := detectLanguage(jibber_jabber.DetectLanguage)
 
-	// detect the user's language
-	userLang, err := jibber_jabber.DetectLanguage()
-	if err != nil {
-		if err.Error() != "Could not detect Language" {
-			return nil, err
-		}
-		userLang = "C"
-	}
 	log.Info("language: " + userLang)
 
-	// create a i18n bundle that can be used to add translations and other things
-	i18nBundle := &i18n.Bundle{DefaultLanguage: language.English}
-
-	addBundles(log, i18nBundle)
-
-	// return the new localizer that can be used to translate text
-	i18nLocalizer := i18n.NewLocalizer(i18nBundle, userLang)
-
-	localizer := &Localizer{
-		i18nLocalizer: i18nLocalizer,
-		language:      userLang,
-		Log:           log,
-	}
-
-	return localizer, nil
+	return setupLocalizer(log, userLang)
 }
 
 // Localize handels the translations
@@ -96,3 +75,29 @@ func addBundles(log *logrus.Logger, i18nBundle *i18n.Bundle) {
 	}
 
 }
+
+// detectLanguage extracts user language from environment
+func detectLanguage(langDetector func() (string, error)) string {
+	if userLang, err := langDetector(); err == nil {
+		return userLang
+	}
+
+	return "C"
+}
+
+// setupLocalizer creates a new localizer using given userLang
+func setupLocalizer(log *logrus.Logger, userLang string) *Localizer {
+	// create a i18n bundle that can be used to add translations and other things
+	i18nBundle := &i18n.Bundle{DefaultLanguage: language.English}
+
+	addBundles(log, i18nBundle)
+
+	// return the new localizer that can be used to translate text
+	i18nLocalizer := i18n.NewLocalizer(i18nBundle, userLang)
+
+	return &Localizer{
+		i18nLocalizer: i18nLocalizer,
+		language:      userLang,
+		Log:           log,
+	}
+}

pkg/i18n/i18n_test.go

@@ -1,7 +1,7 @@
 package i18n
 
 import (
-	"os"
+	"fmt"
 	"testing"
 
 	"github.com/nicksnyder/go-i18n/v2/i18n"
@@ -11,38 +11,46 @@ import (
 )
 
 func TestNewLocalizer(t *testing.T) {
-	type scenario struct {
-		setup    func()
-		test     func(*Localizer, error)
-		teardown func()
-	}
+	assert.NotNil(t, NewLocalizer(logrus.New()))
+}
 
-	LCALL := os.Getenv("LC_ALL")
-	LANG := os.Getenv("LANG")
+func TestDetectLanguage(t *testing.T) {
+	type scenario struct {
+		langDetector func() (string, error)
+		expected     string
+	}
 
 	scenarios := []scenario{
 		{
-			func() {
-				os.Setenv("LC_ALL", "")
-				os.Setenv("LANG", "")
-			},
-			func(l *Localizer, err error) {
-				assert.EqualValues(t, "C", l.GetLanguage())
-			},
-			func() {
-				os.Setenv("LC_ALL", LCALL)
-				os.Setenv("LANG", LANG)
+			func() (string, error) {
+				return "", fmt.Errorf("An error occurred")
 			},
+			"C",
 		},
 		{
-			func() {
-				os.Setenv("LC_ALL", "whatever")
-				os.Setenv("LANG", "whatever")
+			func() (string, error) {
+				return "en", nil
 			},
-			func(l *Localizer, err error) {
-				assert.NoError(t, err)
+			"en",
+		},
+	}
 
-				assert.EqualValues(t, "whatever", l.GetLanguage())
+	for _, s := range scenarios {
+		assert.EqualValues(t, s.expected, detectLanguage(s.langDetector))
+	}
+}
+
+func TestLocalizer(t *testing.T) {
+	type scenario struct {
+		userLang string
+		test     func(*Localizer)
+	}
+
+	scenarios := []scenario{
+		{
+			"C",
+			func(l *Localizer) {
+				assert.EqualValues(t, "C", l.GetLanguage())
 				assert.Equal(t, "Diff", l.Localize(&i18n.LocalizeConfig{
 					DefaultMessage: &i18n.Message{
 						ID: "DiffTitle",
@@ -51,18 +59,10 @@ func TestNewLocalizer(t *testing.T) {
 				assert.Equal(t, "Diff", l.SLocalize("DiffTitle"))
 				assert.Equal(t, "Are you sure you want delete the branch test ?", l.TemplateLocalize("DeleteBranchMessage", Teml{"selectedBranchName": "test"}))
 			},
-			func() {
-				os.Setenv("LC_ALL", LCALL)
-				os.Setenv("LANG", LANG)
-			},
 		},
 		{
-			func() {
-				os.Setenv("LC_ALL", "nl")
-			},
-			func(l *Localizer, err error) {
-				assert.NoError(t, err)
-
+			"nl",
+			func(l *Localizer) {
 				assert.EqualValues(t, "nl", l.GetLanguage())
 				assert.Equal(t, "Diff", l.Localize(&i18n.LocalizeConfig{
 					DefaultMessage: &i18n.Message{
@@ -72,15 +72,10 @@ func TestNewLocalizer(t *testing.T) {
 				assert.Equal(t, "Diff", l.SLocalize("DiffTitle"))
 				assert.Equal(t, "Weet je zeker dat je test branch wil verwijderen?", l.TemplateLocalize("DeleteBranchMessage", Teml{"selectedBranchName": "test"}))
 			},
-			func() {
-				os.Setenv("LC_ALL", LCALL)
-			},
 		},
 	}
 
 	for _, s := range scenarios {
-		s.setup()
-		s.test(NewLocalizer(logrus.New()))
-		s.teardown()
+		s.test(setupLocalizer(logrus.New(), s.userLang))
 	}
 }