feat: add tests

Author: jayantxie

connstate/poll_cache_test.go

@@ -0,0 +1,33 @@
+// Copyright 2025 CloudWeGo Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package connstate
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestPollCache(t *testing.T) {
+	fd := pollcache.alloc()
+	pollcache.freeable(fd)
+	assert.Equal(t, 1, len(pollcache.freelist))
+	fd1 := pollcache.alloc()
+	assert.NotEqual(t, fd, fd1)
+	pollcache.free()
+	assert.Equal(t, 0, len(pollcache.freelist))
+	fd2 := pollcache.alloc()
+	assert.Equal(t, fd, fd2)
+}