From 4630d94bac42408b0b581d24e74706fea7337313 Mon Sep 17 00:00:00 2001
From: Dmitrii Malinovskii <you@example.com>
Date: Mon, 17 Jun 2024 19:54:01 +0400
Subject: [PATCH] sort list of languages

---
 internal/app/languages.go              |  6 +++++
 internal/app/languages_private_test.go | 31 ++++++++++++++++++++++++++
 2 files changed, 37 insertions(+)
 create mode 100644 internal/app/languages_private_test.go

diff --git a/internal/app/languages.go b/internal/app/languages.go
index 26119ab..d68830c 100644
--- a/internal/app/languages.go
+++ b/internal/app/languages.go
@@ -4,6 +4,8 @@ import (
 	"fmt"
 	"io"
 	"reflect"
+	"slices"
+	"strings"
 
 	"github.com/cucumber/common/gherkin/go/v24"
 )
@@ -14,6 +16,10 @@ func runListFeatureLanguages(out io.Writer) error {
 		return fmt.Errorf("getting feature languages: %w", err)
 	}
 
+	slices.SortFunc(languages, func(a, b *gherkin.Dialect) int {
+		return strings.Compare(a.Language, b.Language)
+	})
+
 	for _, lang := range languages {
 		fmt.Fprintf(out, "%s\t%s\t%s\n", lang.Language, lang.Name, lang.Native)
 	}
diff --git a/internal/app/languages_private_test.go b/internal/app/languages_private_test.go
new file mode 100644
index 0000000..dd4303a
--- /dev/null
+++ b/internal/app/languages_private_test.go
@@ -0,0 +1,31 @@
+package app
+
+import (
+	"bytes"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestRunListFeatureLanguages(t *testing.T) {
+	t.Parallel()
+
+	t.Run("it produces a stable output", func(t *testing.T) {
+		t.Parallel()
+
+		var buf bytes.Buffer
+
+		require.NoError(t, runListFeatureLanguages(&buf))
+
+		out1 := buf.String()
+
+		buf.Reset()
+
+		require.NoError(t, runListFeatureLanguages(&buf))
+
+		out2 := buf.String()
+
+		assert.Equal(t, out1, out2)
+	})
+}