diff --git a/internal/circuit/ready_test.go b/internal/circuit/ready_test.go
new file mode 100644
index 0000000..7b0b1c2
--- /dev/null
+++ b/internal/circuit/ready_test.go
@@ -0,0 +1,52 @@
+package circuit
+
+import (
+	"context"
+	"testing"
+	"time"
+)
+
+func TestReadyOnce(t *testing.T) {
+	ready := Ready{}
+	timeout, _ := context.WithTimeout(context.Background(), 50*time.Millisecond)
+
+	go ready.Mark()
+
+	select {
+	case <-timeout.Done():
+		t.Error("timeout reached")
+	case <-ready.On():
+	}
+}
+
+func TestReadyOnceMultipleMark(t *testing.T) {
+	ready := Ready{}
+	timeout, _ := context.WithTimeout(context.Background(), 50*time.Millisecond)
+
+	go ready.Mark()
+	go ready.Mark()
+
+	select {
+	case <-timeout.Done():
+		t.Error("timeout reached")
+	case <-ready.On():
+	}
+}
+
+func TestReadyOnceMultipleListeners(t *testing.T) {
+	ready := Ready{}
+	timeout, _ := context.WithTimeout(context.Background(), 50*time.Millisecond)
+
+	listener := func() {
+		select {
+		case <-timeout.Done():
+			t.Error("timeout reached")
+		case <-ready.On():
+		}
+	}
+
+	go listener()
+	go listener()
+
+	ready.Mark()
+}