tools: align locale diagnostics and generate native language names

tools/logging/locale_test.go

@@ -0,0 +1,38 @@
+package logging
+
+import (
+	"bytes"
+	"reflect"
+	"strings"
+	"testing"
+)
+
+func TestMissingTranslations(t *testing.T) {
+	missing := map[string][]string{
+		"fr-FR": {"mail.second", "mail.first"},
+		"en-US": nil,
+		"de-DE": {"mail.first"},
+	}
+	want := "Missing translation keys:\n" +
+		"Language  Fallback  Key\n" +
+		"de-DE     en-US     mail.first\n" +
+		"fr-FR     en-US     mail.first\n" +
+		"                    mail.second"
+	message := missingTranslations(missing)
+	if message != want {
+		t.Fatalf("got %q, want %q", message, want)
+	}
+	if !reflect.DeepEqual(missing["fr-FR"], []string{"mail.second", "mail.first"}) {
+		t.Fatal("report mutated input keys")
+	}
+	var output bytes.Buffer
+	write(&output, true, "W", "Locale", message)
+	for _, line := range strings.Split(strings.TrimSuffix(output.String(), "\n"), "\n") {
+		if !strings.HasPrefix(line, "\033[33m[W]\033[0m [Locale] ") {
+			t.Fatalf("missing warning prefix: %q", line)
+		}
+	}
+	if missingTranslations(nil) != "" || missingTranslations(map[string][]string{"en-US": nil}) != "" {
+		t.Fatal("empty report produced a warning")
+	}
+}