Add collector cache test

Signed-off-by: Ananya Kumar Mallik <[email protected]>

collectors/cache_test.go

@@ -74,3 +74,56 @@ func TestDescriptorCache(t *testing.T) {
 		t.Error("cache entries should have expired")
 	}
 }
+
+func TestCollectorCache(t *testing.T) {
+	createCollector := func(id string) *MonitoringCollector {
+		return &MonitoringCollector{
+			projectID: id,
+		}
+	}
+
+	t.Run("basic cache Op", func(t *testing.T) {
+		ttl := 1 * time.Second
+		cache := NewCollectorCache(ttl)
+		collector := createCollector("test-project")
+		key := "test-key"
+
+		cache.Store(key, collector)
+
+		if _, found := cache.Get("test-key"); !found {
+			t.Error("Collector should be available in cache before TTL")
+		}
+
+		time.Sleep(2 * ttl)
+		if _, found := cache.Get("test-key"); found {
+			t.Error("Collector should have expired")
+		}
+	})
+
+	t.Run("multiple collectors", func(t *testing.T) {
+		ttl := 1 * time.Second
+		cache := NewCollectorCache(ttl)
+
+		collectors := map[string]*MonitoringCollector{
+			"test-key-1": createCollector("test-project-1"),
+			"test-key-2": createCollector("test-project-2"),
+			"test-key-3": createCollector("test-project-3"),
+		}
+
+		for k, v := range collectors {
+			cache.Store(k, v)
+		}
+
+		for k, original := range collectors {
+			cached, found := cache.Get(k)
+			if !found {
+				t.Errorf("Collector %s not found in cache", k)
+				continue
+			}
+
+			if cached.projectID != original.projectID {
+				t.Errorf("Wrong collector for key %s. Got projectId %s, want %s", k, cached.projectID, original.projectID)
+			}
+		}
+	})
+}