fix: unblock jikan limiter waits

integrations/jikan/rate/limiter_test.go

@@ -0,0 +1,40 @@
+package rate
+
+import (
+	"context"
+	"testing"
+	"time"
+)
+
+func TestLimiterDoesNotHoldLockWhileWaiting(t *testing.T) {
+	limiter := NewLimiter(250 * time.Millisecond)
+	if err := limiter.Wait(context.Background()); err != nil {
+		t.Fatalf("initial wait: %v", err)
+	}
+
+	firstCtx, cancelFirst := context.WithCancel(context.Background())
+	defer cancelFirst()
+
+	firstDone := make(chan error, 1)
+	go func() {
+		firstDone <- limiter.Wait(firstCtx)
+	}()
+
+	time.Sleep(20 * time.Millisecond)
+
+	secondCtx, cancelSecond := context.WithTimeout(context.Background(), 30*time.Millisecond)
+	defer cancelSecond()
+
+	startedAt := time.Now()
+	err := limiter.Wait(secondCtx)
+	elapsed := time.Since(startedAt)
+	if err == nil {
+		t.Fatal("second wait succeeded, want context timeout")
+	}
+	if elapsed > 150*time.Millisecond {
+		t.Fatalf("second wait took %s, want it to observe context timeout without waiting behind first caller", elapsed)
+	}
+
+	cancelFirst()
+	<-firstDone
+}