fix(Pywalfox): update distro detection handling

- Fixes #2220

core/internal/utils/exec_test.go

@@ -0,0 +1,55 @@
+package utils
+
+import (
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestCommandExistsFallsBackToLocalBin(t *testing.T) {
+	home := t.TempDir()
+	binDir := filepath.Join(home, ".local", "bin")
+	require.NoError(t, os.MkdirAll(binDir, 0o755))
+	require.NoError(t, os.WriteFile(filepath.Join(binDir, "pywalfox"), []byte("#!/bin/sh\n"), 0o755))
+
+	t.Setenv("HOME", home)
+	t.Setenv("PATH", t.TempDir())
+
+	assert.True(t, CommandExists("pywalfox"))
+}
+
+func TestCommandExistsIgnoresNonExecutableLocalBinFile(t *testing.T) {
+	home := t.TempDir()
+	binDir := filepath.Join(home, ".local", "bin")
+	require.NoError(t, os.MkdirAll(binDir, 0o755))
+	require.NoError(t, os.WriteFile(filepath.Join(binDir, "pywalfox"), []byte("not executable"), 0o644))
+
+	t.Setenv("HOME", home)
+	t.Setenv("PATH", t.TempDir())
+
+	assert.False(t, CommandExists("pywalfox"))
+}
+
+func TestEnvWithUserBinPathPrependsLocalBin(t *testing.T) {
+	home := t.TempDir()
+	t.Setenv("HOME", home)
+
+	env := EnvWithUserBinPath([]string{"PATH=/usr/bin", "OTHER=value"})
+	var pathValue string
+	for _, entry := range env {
+		if strings.HasPrefix(entry, "PATH=") {
+			pathValue = strings.TrimPrefix(entry, "PATH=")
+			break
+		}
+	}
+
+	parts := filepath.SplitList(pathValue)
+	require.NotEmpty(t, parts)
+	assert.Equal(t, filepath.Join(home, ".local", "bin"), parts[0])
+	assert.Contains(t, parts, "/usr/local/bin")
+	assert.Contains(t, env, "OTHER=value")
+}