tests: fix flaky_TestConnectionHandlerOpenUpdateClose

-Increased the waiting time to milliseconds.
-Changed the require.Nilf on require.NoError.

Closes #502

Author: New year

CHANGELOG.md

@@ -33,6 +33,8 @@ Versioning](http://semver.org/spec/v2.0.0.html) except to the first release.
 
 ### Fixed
 
+* Fixed the fluctuating behavior of the TestConnectionHandlerOpenUpdateClose test by increasing the waiting time (#502).
+
 ## [v2.4.1] - 2025-10-16
 
 This maintenance release marks the end of active development on the `v2`

pool/connection_pool_test.go

@@ -1115,15 +1115,15 @@ func TestConnectionHandlerOpenUpdateClose(t *testing.T) {
 	poolInstances := makeInstances(poolServers, connOpts)
 	roles := []bool{false, true}
 
-	ctx, cancel := test_helpers.GetPoolConnectContext()
+	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
 	defer cancel()
 
 	err := test_helpers.SetClusterRO(ctx, makeDialers(poolServers), connOpts, roles)
-	require.Nilf(t, err, "fail to set roles for cluster")
+	require.NoError(t, err, "fail to set roles for cluster")
 
 	h := &testHandler{}
 	poolOpts := pool.Opts{
-		CheckTimeout:      100 * time.Microsecond,
+		CheckTimeout:      100 * time.Millisecond,
 		ConnectionHandler: h,
 	}
 	connPool, err := pool.ConnectWithOpts(ctx, poolInstances, poolOpts)