Wrote worker tests.

responderpool/worker_watchdog_test.go

@@ -1 +1,104 @@
 package responderpool
+
+import (
+	"context"
+	"git.wisehodl.dev/jay/go-honeybee/honeybeetest"
+	"github.com/stretchr/testify/assert"
+	"sync/atomic"
+	"testing"
+	"time"
+)
+
+func TestRunWatchdog(t *testing.T) {
+	t.Run("heartbeat resets timer, onInactive not called", func(t *testing.T) {
+		heartbeat := make(chan struct{})
+		ctx, cancel := context.WithCancel(context.Background())
+		defer cancel()
+
+		called := atomic.Bool{}
+		go RunWatchdog(ctx, func() { called.Store(true) }, heartbeat, 200*time.Millisecond)
+
+		for i := 0; i < 5; i++ {
+			time.Sleep(20 * time.Millisecond)
+			heartbeat <- struct{}{}
+		}
+
+		honeybeetest.Never(t, func() bool {
+			return called.Load()
+		}, "unexpected onInactive call")
+	})
+
+	t.Run("timeout fires onInactive exactly once", func(t *testing.T) {
+		heartbeat := make(chan struct{})
+		ctx, cancel := context.WithCancel(context.Background())
+		defer cancel()
+
+		count := atomic.Int32{}
+		done := make(chan struct{})
+		go RunWatchdog(ctx, func() {
+			count.Add(1)
+			close(done)
+		}, heartbeat, 20*time.Millisecond)
+
+		honeybeetest.Eventually(t, func() bool {
+			select {
+			case <-done:
+				return true
+			default:
+				return false
+			}
+		}, "expected onInactive")
+
+		assert.Equal(t, int32(1), count.Load())
+	})
+
+	t.Run("ctx.Done exits without calling onInactive", func(t *testing.T) {
+		heartbeat := make(chan struct{})
+		ctx, cancel := context.WithCancel(context.Background())
+
+		called := atomic.Bool{}
+		done := make(chan struct{})
+		go func() {
+			RunWatchdog(ctx, func() { called.Store(true) }, heartbeat, 20*time.Second)
+			close(done)
+		}()
+
+		cancel()
+
+		honeybeetest.Eventually(t, func() bool {
+			select {
+			case <-done:
+				return true
+			default:
+				return false
+			}
+		}, "expected RunWatchdog to exit")
+
+		assert.False(t, called.Load())
+	})
+
+	t.Run("zero timeout exits on ctx.Done without firing", func(t *testing.T) {
+		heartbeat := make(chan struct{})
+		ctx, cancel := context.WithCancel(context.Background())
+
+		called := atomic.Bool{}
+		done := make(chan struct{})
+		go func() {
+			RunWatchdog(ctx, func() { called.Store(true) }, heartbeat, 0)
+			close(done)
+		}()
+
+		cancel()
+
+		honeybeetest.Eventually(t, func() bool {
+			select {
+			case <-done:
+				return true
+			default:
+				return false
+			}
+		}, "expected RunWatchdog to exit")
+
+		assert.False(t, called.Load())
+	})
+}