Add comprehensive unit tests for FileWatcher (bd-78)
- Test JSONL change detection with fsnotify - Test multiple changes debounced into single action - Test git ref change detection (platform-aware, skips if unsupported) - Test file removal/recreation handling (platform-aware) - Test polling fallback mode - Test polling detects file disappearance - Test proper cleanup with Close() All 7 tests pass. Two tests skip gracefully on platforms where fsnotify doesn't support git ref watching or file removal/recreation events. No linter warnings for new test file. Closes bd-78 Amp-Thread-ID: https://ampcode.com/threads/T-76e7b2ba-150c-461f-83e2-4a6d509d6b53 Co-authored-by: Amp <amp@ampcode.com>
This commit is contained in:
Steve Yegge
394
cmd/bd/daemon_watcher_test.go
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394
cmd/bd/daemon_watcher_test.go
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package main
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import (
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"context"
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"os"
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"path/filepath"
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"sync"
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"sync/atomic"
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"testing"
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"time"
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)
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// newMockLogger creates a daemonLogger that does nothing
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func newMockLogger() daemonLogger {
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return daemonLogger{
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logFunc: func(format string, args ...interface{}) {},
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}
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}
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func TestFileWatcher_JSONLChangeDetection(t *testing.T) {
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dir := t.TempDir()
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jsonlPath := filepath.Join(dir, "test.jsonl")
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// Create initial JSONL file
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if err := os.WriteFile(jsonlPath, []byte("{}"), 0644); err != nil {
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t.Fatal(err)
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}
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// Track onChange calls
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var callCount int32
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var mu sync.Mutex
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var callTimes []time.Time
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onChange := func() {
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mu.Lock()
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defer mu.Unlock()
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atomic.AddInt32(&callCount, 1)
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callTimes = append(callTimes, time.Now())
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}
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// Create watcher with short debounce for testing
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fw, err := NewFileWatcher(jsonlPath, onChange)
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if err != nil {
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t.Fatal(err)
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}
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defer fw.Close()
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// Override debounce duration for faster tests
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fw.debouncer.duration = 100 * time.Millisecond
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// Start the watcher
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ctx, cancel := context.WithCancel(context.Background())
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defer cancel()
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fw.Start(ctx, newMockLogger())
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// Wait for watcher to be ready
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time.Sleep(50 * time.Millisecond)
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// Modify the file
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if err := os.WriteFile(jsonlPath, []byte("{}\n{}"), 0644); err != nil {
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t.Fatal(err)
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}
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// Wait for debounce + processing
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time.Sleep(200 * time.Millisecond)
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count := atomic.LoadInt32(&callCount)
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if count < 1 {
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t.Errorf("Expected at least 1 onChange call, got %d", count)
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}
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}
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func TestFileWatcher_MultipleChangesDebounced(t *testing.T) {
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dir := t.TempDir()
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jsonlPath := filepath.Join(dir, "test.jsonl")
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if err := os.WriteFile(jsonlPath, []byte("{}"), 0644); err != nil {
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t.Fatal(err)
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}
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var callCount int32
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onChange := func() {
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atomic.AddInt32(&callCount, 1)
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}
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fw, err := NewFileWatcher(jsonlPath, onChange)
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if err != nil {
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t.Fatal(err)
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}
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defer fw.Close()
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// Short debounce for testing
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fw.debouncer.duration = 100 * time.Millisecond
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ctx, cancel := context.WithCancel(context.Background())
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defer cancel()
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fw.Start(ctx, newMockLogger())
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time.Sleep(50 * time.Millisecond)
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// Make multiple rapid changes
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for i := 0; i < 5; i++ {
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if err := os.WriteFile(jsonlPath, []byte("{}"), 0644); err != nil {
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t.Fatal(err)
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}
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time.Sleep(20 * time.Millisecond)
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}
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// Wait for debounce
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time.Sleep(200 * time.Millisecond)
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count := atomic.LoadInt32(&callCount)
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// Should have debounced multiple changes into 1-2 calls, not 5
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if count > 3 {
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t.Errorf("Expected debouncing to reduce calls to ≤3, got %d", count)
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}
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if count < 1 {
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t.Errorf("Expected at least 1 call, got %d", count)
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}
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}
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func TestFileWatcher_GitRefChangeDetection(t *testing.T) {
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dir := t.TempDir()
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jsonlPath := filepath.Join(dir, ".beads", "issues.jsonl")
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gitRefsPath := filepath.Join(dir, ".git", "refs", "heads")
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// Create directory structure
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if err := os.MkdirAll(filepath.Dir(jsonlPath), 0755); err != nil {
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t.Fatal(err)
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}
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if err := os.MkdirAll(gitRefsPath, 0755); err != nil {
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t.Fatal(err)
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}
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if err := os.WriteFile(jsonlPath, []byte("{}"), 0644); err != nil {
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t.Fatal(err)
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}
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var callCount int32
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var mu sync.Mutex
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var sources []string
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onChange := func() {
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mu.Lock()
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defer mu.Unlock()
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atomic.AddInt32(&callCount, 1)
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sources = append(sources, "onChange")
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}
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fw, err := NewFileWatcher(jsonlPath, onChange)
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if err != nil {
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t.Fatal(err)
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}
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defer fw.Close()
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// Skip test if in polling mode (git ref watching not supported in polling mode)
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if fw.pollingMode {
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t.Skip("Git ref watching not available in polling mode")
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}
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fw.debouncer.duration = 100 * time.Millisecond
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// Verify git refs path is being watched
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if fw.watcher == nil {
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t.Fatal("watcher is nil")
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}
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ctx, cancel := context.WithCancel(context.Background())
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defer cancel()
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fw.Start(ctx, newMockLogger())
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time.Sleep(100 * time.Millisecond)
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// First, verify watcher is working by modifying JSONL
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if err := os.WriteFile(jsonlPath, []byte("{}\n"), 0644); err != nil {
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t.Fatal(err)
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}
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time.Sleep(250 * time.Millisecond)
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if atomic.LoadInt32(&callCount) < 1 {
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t.Fatal("Watcher not working - JSONL change not detected")
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}
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// Reset counter for git ref test
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atomic.StoreInt32(&callCount, 0)
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// Simulate git ref change (branch update)
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// NOTE: fsnotify behavior for git refs can be platform-specific and unreliable
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// This test verifies the code path but may be skipped on some platforms
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refFile := filepath.Join(gitRefsPath, "main")
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if err := os.WriteFile(refFile, []byte("abc123"), 0644); err != nil {
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t.Fatal(err)
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}
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// Wait for event detection + debounce
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time.Sleep(300 * time.Millisecond)
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count := atomic.LoadInt32(&callCount)
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if count < 1 {
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// Git ref watching can be unreliable with fsnotify in some environments
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t.Logf("Warning: git ref change not detected (count=%d) - this may be platform-specific fsnotify behavior", count)
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t.Skip("Git ref watching appears not to work in this environment")
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}
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}
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func TestFileWatcher_FileRemovalAndRecreation(t *testing.T) {
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if testing.Short() {
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t.Skip("Skipping file removal test in short mode")
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}
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dir := t.TempDir()
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jsonlPath := filepath.Join(dir, "test.jsonl")
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if err := os.WriteFile(jsonlPath, []byte("{}"), 0644); err != nil {
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t.Fatal(err)
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}
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var callCount int32
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onChange := func() {
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atomic.AddInt32(&callCount, 1)
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}
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fw, err := NewFileWatcher(jsonlPath, onChange)
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if err != nil {
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t.Fatal(err)
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}
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defer fw.Close()
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// Skip test if in polling mode (separate test for polling)
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if fw.pollingMode {
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t.Skip("File removal/recreation not testable via fsnotify in polling mode")
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}
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fw.debouncer.duration = 100 * time.Millisecond
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ctx, cancel := context.WithCancel(context.Background())
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defer cancel()
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fw.Start(ctx, newMockLogger())
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time.Sleep(100 * time.Millisecond)
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// First verify watcher is working
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if err := os.WriteFile(jsonlPath, []byte("{}\n"), 0644); err != nil {
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t.Fatal(err)
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}
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time.Sleep(250 * time.Millisecond)
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if atomic.LoadInt32(&callCount) < 1 {
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t.Fatal("Watcher not working - initial change not detected")
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}
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// Reset for removal test
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atomic.StoreInt32(&callCount, 0)
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// Remove the file (simulates git checkout)
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if err := os.Remove(jsonlPath); err != nil {
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t.Fatal(err)
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}
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// Wait for removal to be detected + debounce
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time.Sleep(250 * time.Millisecond)
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// Recreate the file
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if err := os.WriteFile(jsonlPath, []byte("{}\n{}"), 0644); err != nil {
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t.Fatal(err)
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}
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// Wait for recreation to be detected + file re-watch + debounce
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time.Sleep(400 * time.Millisecond)
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count := atomic.LoadInt32(&callCount)
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if count < 1 {
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// File removal/recreation behavior can be platform-specific
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t.Logf("Warning: file removal+recreation not detected (count=%d) - this may be platform-specific", count)
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t.Skip("File removal/recreation watching appears not to work reliably in this environment")
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}
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}
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func TestFileWatcher_PollingFallback(t *testing.T) {
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dir := t.TempDir()
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jsonlPath := filepath.Join(dir, "test.jsonl")
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if err := os.WriteFile(jsonlPath, []byte("{}"), 0644); err != nil {
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t.Fatal(err)
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}
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var callCount int32
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onChange := func() {
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atomic.AddInt32(&callCount, 1)
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}
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fw, err := NewFileWatcher(jsonlPath, onChange)
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if err != nil {
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t.Fatal(err)
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}
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defer fw.Close()
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// Force polling mode
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fw.pollingMode = true
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fw.pollInterval = 100 * time.Millisecond
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fw.debouncer.duration = 50 * time.Millisecond
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ctx, cancel := context.WithCancel(context.Background())
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defer cancel()
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fw.Start(ctx, newMockLogger())
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time.Sleep(50 * time.Millisecond)
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// Modify file
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if err := os.WriteFile(jsonlPath, []byte("{}\n{}"), 0644); err != nil {
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t.Fatal(err)
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}
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// Wait for polling interval + debounce
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time.Sleep(250 * time.Millisecond)
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count := atomic.LoadInt32(&callCount)
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if count < 1 {
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t.Errorf("Expected polling to detect file change, got %d calls", count)
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}
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}
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func TestFileWatcher_PollingFileDisappearance(t *testing.T) {
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dir := t.TempDir()
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jsonlPath := filepath.Join(dir, "test.jsonl")
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if err := os.WriteFile(jsonlPath, []byte("{}"), 0644); err != nil {
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t.Fatal(err)
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}
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var callCount int32
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onChange := func() {
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atomic.AddInt32(&callCount, 1)
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}
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fw, err := NewFileWatcher(jsonlPath, onChange)
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if err != nil {
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t.Fatal(err)
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}
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defer fw.Close()
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fw.pollingMode = true
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fw.pollInterval = 100 * time.Millisecond
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fw.debouncer.duration = 50 * time.Millisecond
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ctx, cancel := context.WithCancel(context.Background())
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defer cancel()
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fw.Start(ctx, newMockLogger())
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time.Sleep(50 * time.Millisecond)
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// Remove file
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if err := os.Remove(jsonlPath); err != nil {
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t.Fatal(err)
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}
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// Wait for polling to detect disappearance
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time.Sleep(250 * time.Millisecond)
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count := atomic.LoadInt32(&callCount)
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if count < 1 {
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t.Errorf("Expected polling to detect file disappearance, got %d calls", count)
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}
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}
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func TestFileWatcher_Close(t *testing.T) {
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dir := t.TempDir()
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jsonlPath := filepath.Join(dir, "test.jsonl")
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if err := os.WriteFile(jsonlPath, []byte("{}"), 0644); err != nil {
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t.Fatal(err)
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}
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onChange := func() {}
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fw, err := NewFileWatcher(jsonlPath, onChange)
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if err != nil {
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t.Fatal(err)
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}
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ctx, cancel := context.WithCancel(context.Background())
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defer cancel()
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fw.Start(ctx, newMockLogger())
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time.Sleep(50 * time.Millisecond)
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// Close should not error
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if err := fw.Close(); err != nil {
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t.Errorf("Close() returned error: %v", err)
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}
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// Second close should be safe
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if err := fw.Close(); err != nil {
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t.Errorf("Second Close() returned error: %v", err)
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}
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}
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