Move internal packages to an internal folder

For reference: https://go.dev/doc/go1.4#internalpackages

internal/locale/printer_test.go

@@ -0,0 +1,174 @@
+// SPDX-FileCopyrightText: Copyright The Miniflux Authors. All rights reserved.
+// SPDX-License-Identifier: Apache-2.0
+
+package locale // import "miniflux.app/v2/internal/locale"
+
+import "testing"
+
+func TestTranslateWithMissingLanguage(t *testing.T) {
+	defaultCatalog = catalog{}
+	translation := NewPrinter("invalid").Printf("missing.key")
+
+	if translation != "missing.key" {
+		t.Errorf(`Wrong translation, got %q`, translation)
+	}
+}
+
+func TestTranslateWithMissingKey(t *testing.T) {
+	defaultCatalog = catalog{
+		"en_US": translationDict{
+			"k": "v",
+		},
+	}
+
+	translation := NewPrinter("en_US").Printf("missing.key")
+	if translation != "missing.key" {
+		t.Errorf(`Wrong translation, got %q`, translation)
+	}
+}
+
+func TestTranslateWithExistingKey(t *testing.T) {
+	defaultCatalog = catalog{
+		"en_US": translationDict{
+			"auth.username": "Login",
+		},
+	}
+
+	translation := NewPrinter("en_US").Printf("auth.username")
+	if translation != "Login" {
+		t.Errorf(`Wrong translation, got %q`, translation)
+	}
+}
+
+func TestTranslateWithExistingKeyAndPlaceholder(t *testing.T) {
+	defaultCatalog = catalog{
+		"en_US": translationDict{
+			"key": "Test: %s",
+		},
+		"fr_FR": translationDict{
+			"key": "Test : %s",
+		},
+	}
+
+	translation := NewPrinter("fr_FR").Printf("key", "ok")
+	if translation != "Test : ok" {
+		t.Errorf(`Wrong translation, got %q`, translation)
+	}
+}
+
+func TestTranslateWithMissingKeyAndPlaceholder(t *testing.T) {
+	defaultCatalog = catalog{
+		"en_US": translationDict{
+			"auth.username": "Login",
+		},
+		"fr_FR": translationDict{
+			"auth.username": "Identifiant",
+		},
+	}
+
+	translation := NewPrinter("fr_FR").Printf("Status: %s", "ok")
+	if translation != "Status: ok" {
+		t.Errorf(`Wrong translation, got %q`, translation)
+	}
+}
+
+func TestTranslateWithInvalidValue(t *testing.T) {
+	defaultCatalog = catalog{
+		"en_US": translationDict{
+			"auth.username": "Login",
+		},
+		"fr_FR": translationDict{
+			"auth.username": true,
+		},
+	}
+
+	translation := NewPrinter("fr_FR").Printf("auth.username")
+	if translation != "auth.username" {
+		t.Errorf(`Wrong translation, got %q`, translation)
+	}
+}
+
+func TestTranslatePluralWithDefaultRule(t *testing.T) {
+	defaultCatalog = catalog{
+		"en_US": translationDict{
+			"number_of_users": []string{"%d user (%s)", "%d users (%s)"},
+		},
+		"fr_FR": translationDict{
+			"number_of_users": []string{"%d utilisateur (%s)", "%d utilisateurs (%s)"},
+		},
+	}
+
+	printer := NewPrinter("fr_FR")
+	translation := printer.Plural("number_of_users", 1, 1, "some text")
+	expected := "1 utilisateur (some text)"
+	if translation != expected {
+		t.Errorf(`Wrong translation, got %q instead of %q`, translation, expected)
+	}
+
+	translation = printer.Plural("number_of_users", 2, 2, "some text")
+	expected = "2 utilisateurs (some text)"
+	if translation != expected {
+		t.Errorf(`Wrong translation, got %q instead of %q`, translation, expected)
+	}
+}
+
+func TestTranslatePluralWithRussianRule(t *testing.T) {
+	defaultCatalog = catalog{
+		"en_US": translationDict{
+			"time_elapsed.years": []string{"%d year", "%d years"},
+		},
+		"ru_RU": translationDict{
+			"time_elapsed.years": []string{"%d год назад", "%d года назад", "%d лет назад"},
+		},
+	}
+
+	printer := NewPrinter("ru_RU")
+
+	translation := printer.Plural("time_elapsed.years", 1, 1)
+	expected := "1 год назад"
+	if translation != expected {
+		t.Errorf(`Wrong translation, got %q instead of %q`, translation, expected)
+	}
+
+	translation = printer.Plural("time_elapsed.years", 2, 2)
+	expected = "2 года назад"
+	if translation != expected {
+		t.Errorf(`Wrong translation, got %q instead of %q`, translation, expected)
+	}
+
+	translation = printer.Plural("time_elapsed.years", 5, 5)
+	expected = "5 лет назад"
+	if translation != expected {
+		t.Errorf(`Wrong translation, got %q instead of %q`, translation, expected)
+	}
+}
+
+func TestTranslatePluralWithMissingTranslation(t *testing.T) {
+	defaultCatalog = catalog{
+		"en_US": translationDict{
+			"number_of_users": []string{"%d user (%s)", "%d users (%s)"},
+		},
+		"fr_FR": translationDict{},
+	}
+	translation := NewPrinter("fr_FR").Plural("number_of_users", 2)
+	expected := "number_of_users"
+	if translation != expected {
+		t.Errorf(`Wrong translation, got %q instead of %q`, translation, expected)
+	}
+}
+
+func TestTranslatePluralWithInvalidValues(t *testing.T) {
+	defaultCatalog = catalog{
+		"en_US": translationDict{
+			"number_of_users": []string{"%d user (%s)", "%d users (%s)"},
+		},
+		"fr_FR": translationDict{
+			"number_of_users": "must be a slice",
+		},
+	}
+	translation := NewPrinter("fr_FR").Plural("number_of_users", 2)
+	expected := "number_of_users"
+	if translation != expected {
+		t.Errorf(`Wrong translation, got %q instead of %q`, translation, expected)
+	}
+}