test(containermanager): add autodetect constructor tests

Signed-off-by: Fabrizio Sestito <fabrizio.sestito@suse.com>

pkg/containermanager/providers/autodetect_test.go

@@ -0,0 +1,67 @@
+package providers_test
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+
+	"github.com/89luca89/distrobox/pkg/containermanager/providers"
+)
+
+func TestNewAutoDetect(t *testing.T) {
+	tests := []struct {
+		name         string
+		binaries     []string
+		expectedName string
+		expectError  bool
+	}{
+		{
+			name:         "podman only",
+			binaries:     []string{"podman"},
+			expectedName: "podman",
+		},
+		{
+			name:         "docker only",
+			binaries:     []string{"docker"},
+			expectedName: "docker",
+		},
+		{
+			name:         "both present",
+			binaries:     []string{"podman", "docker"},
+			expectedName: "podman",
+		},
+		{
+			name:         "podman-launcher only",
+			binaries:     []string{"podman-launcher"},
+			expectedName: "podman",
+		},
+		{
+			name:        "nothing available",
+			binaries:    []string{},
+			expectError: true,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			dir := t.TempDir()
+			for _, bin := range tt.binaries {
+				err := os.WriteFile(filepath.Join(dir, bin), []byte("#!/bin/sh\n"), 0o755)
+				require.NoError(t, err)
+			}
+			t.Setenv("PATH", dir)
+
+			cm, err := providers.NewAutoDetect(false, "sudo", false)
+			if tt.expectError {
+				require.Error(t, err)
+				assert.Nil(t, cm)
+			} else {
+				require.NoError(t, err)
+				assert.Equal(t, tt.expectedName, cm.Name())
+			}
+		})
+	}
+}