test(internal/procfs/sysfs): add unit test for fs

Author: huhong-web

internal/procfs/sysfs/fs_test.go

@@ -0,0 +1,139 @@
+// Copyright 2026 The HuaTuo Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+package sysfs
+
+import (
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+
+	"huatuo-bamai/internal/procfs"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestDefaultPath(t *testing.T) {
+	got := DefaultPath()
+	assert.Equal(t, "/sys", got)
+}
+
+func TestNewDefaultFS_Filesystem(t *testing.T) {
+	tests := []struct {
+		name        string
+		setup       func(t *testing.T) string
+		wantErr     bool
+		errContains string
+	}{
+		{
+			name: "valid path directory",
+			setup: func(t *testing.T) string {
+				tmpDir := t.TempDir()
+				sysPath := filepath.Join(tmpDir, "sys")
+				require.NoError(t, os.MkdirAll(sysPath, 0o755))
+				return tmpDir
+			},
+			wantErr: false,
+		},
+		{
+			name: "invalid file path",
+			setup: func(t *testing.T) string {
+				tmpDir := t.TempDir()
+				sysPath := filepath.Join(tmpDir, "file")
+				require.NoError(t, os.WriteFile(sysPath, []byte("invalid file"), 0o600))
+				return sysPath
+			},
+			wantErr: true,
+		},
+		{
+			name: "non-existent path",
+			setup: func(t *testing.T) string {
+				return "/nonexistent/path/xyz"
+			},
+			wantErr: true,
+		},
+		{
+			name: "valid --sys!! path",
+			setup: func(t *testing.T) string {
+				tmpDir := t.TempDir()
+				sysPath := filepath.Join(tmpDir, "--sys!!")
+				require.NoError(t, os.MkdirAll(filepath.Join(sysPath, "sys"), 0o755))
+				return sysPath
+			},
+			wantErr: false,
+		},
+	}
+	originalPrefix := strings.TrimSuffix(DefaultPath(), "sys")
+	defer func() { procfs.RootPrefix(originalPrefix) }()
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			procfs.RootPrefix(tt.setup(t))
+
+			fs, err := NewDefaultFS()
+			if tt.wantErr {
+				assert.Error(t, err)
+				assert.Equal(t, FS{}, fs)
+			} else {
+				assert.NoError(t, err)
+				assert.NotNil(t, fs)
+			}
+		})
+	}
+}
+
+func TestPath(t *testing.T) {
+	tests := []struct {
+		name  string
+		paths []string
+		want  string
+	}{
+		{
+			name:  "special single component",
+			paths: []string{"//dev"},
+			want:  "/sys/dev",
+		},
+		{
+			name:  "deep path",
+			paths: []string{"class", "net", "eth0"},
+			want:  "/sys/class/net/eth0",
+		},
+		{
+			name:  "empty paths",
+			paths: []string{},
+			want:  "/sys",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := Path(tt.paths...)
+			assert.Equal(t, tt.want, got)
+		})
+	}
+}
+
+// Integration Tests (Real Environment)
+// TEST_INTEGRATION=true go test -v ./internal/procfs/sysfs/...
+func TestNewDefaultFS_Integration(t *testing.T) {
+	if os.Getenv("TEST_INTEGRATION") == "" {
+		t.Skip("Set TEST_INTEGRATION=true to run integration tests")
+	}
+
+	fs, err := NewDefaultFS()
+	if err != nil {
+		t.Skipf("/sys not available: %v", err)
+	}
+	assert.NotNil(t, fs)
+}