test(events): prove WriterLive off/shadow/live hook matrix

Co-authored-by: Cursor <cursoragent@cursor.com>

internal/events/dispatcher_pg_test.go

@@ -295,3 +295,32 @@ func TestE0B_ShadowDoesNotAck_PG(t *testing.T) {
 		t.Fatal(err)
 	}
 }
+
+func TestE2_WriterLiveModes_PG(t *testing.T) {
+	pool, ctx := e0bPool(t)
+	env := fmt.Sprintf("e2-%d", time.Now().UnixNano())
+	if events.WriterLive(ctx, pool, env, events.ConsumerNotify) {
+		t.Fatal("missing row must not be live")
+	}
+	if err := events.SetMode(ctx, pool, env, events.ConsumerNotify, events.ModeOff); err != nil {
+		t.Fatal(err)
+	}
+	if events.WriterLive(ctx, pool, env, events.ConsumerNotify) {
+		t.Fatal("off must keep hook writers")
+	}
+	if err := events.SetMode(ctx, pool, env, events.ConsumerNotify, events.ModeShadow); err != nil {
+		t.Fatal(err)
+	}
+	if events.WriterLive(ctx, pool, env, events.ConsumerNotify) {
+		t.Fatal("shadow must keep hook writers")
+	}
+	if err := events.SetMode(ctx, pool, env, events.ConsumerNotify, events.ModeLive); err != nil {
+		t.Fatal(err)
+	}
+	if !events.WriterLive(ctx, pool, env, events.ConsumerNotify) {
+		t.Fatal("live must stop hook writers")
+	}
+	if err := events.SetMode(ctx, pool, env, events.ConsumerNotify, events.ModeOff); err != nil {
+		t.Fatal(err)
+	}
+}

internal/events/dispatcher_test.go

@@ -183,6 +183,12 @@ func TestAuthAndIntegrityGoDeadLetter(t *testing.T) {
 	}
 }
 
+func TestWriterLiveNilPool(t *testing.T) {
+	if WriterLive(context.Background(), nil, "dev", ConsumerNotify) {
+		t.Fatal("nil pool must keep in-process writers")
+	}
+}
+
 func TestReplayRequiresScope(t *testing.T) {
 	if err := AuthorizeReplay(ReplayRequest{}); err != ErrReplayScope {
 		t.Fatalf("empty: %v", err)