Add test case for ThreadPoolExecutorUtil (#1356)

* Create ThreadFactoryBuilderTest

* Update ThreadFactoryBuilderTest

Methods are covered by multiple unit test cases .
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* Update ThreadFactoryBuilderTest

Add open source protocol.
use @before annotation

* Update ThreadFactoryBuilderTest

* Update ThreadFactoryBuilderTest

* Update ThreadFactoryBuilderTest

* Add test case for MessageWrapper

* Update MessageWrapperTest

* Add test case for ThreadPoolExecutorUtil

Add test case for ThreadPoolExecutorUtil

* Update ThreadPoolExecutorUtilTest

infra/common/src/test/java/cn/hippo4j/common/executor/ThreadPoolExecutorUtilTest

@@ -0,0 +1,89 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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 cn.hippo4j.common.executor;
+
+import cn.hippo4j.common.toolkit.ThreadPoolExecutorUtil;
+import org.junit.Assert;
+import org.junit.Before;
+import org.junit.Test;
+import java.util.concurrent.ArrayBlockingQueue;
+import java.util.concurrent.ThreadPoolExecutor;
+import java.util.concurrent.TimeUnit;
+
+public class ThreadPoolExecutorUtilTest {
+
+    private ThreadPoolExecutor executor;
+    private int corePoolSize;
+    private int maxPoolSize;
+
+    @Before
+    public void testSafeSetPoolSize() {
+        corePoolSize = 2;
+        maxPoolSize = 4;
+        executor = new ThreadPoolExecutor(
+                corePoolSize,
+                maxPoolSize,
+                1L,
+                TimeUnit.SECONDS,
+                new ArrayBlockingQueue<>(10)
+        );
+    }
+
+    @Test
+    public void testEquals(){
+        // Test when the new core pool size equals the original maximum pool size.
+        int newCorePoolSize1 = maxPoolSize;
+        int newMaxPoolSize1 = 6;
+        ThreadPoolExecutorUtil.safeSetPoolSize(executor, newCorePoolSize1, newMaxPoolSize1);
+        Assert.assertEquals(newCorePoolSize1, executor.getCorePoolSize());
+        Assert.assertEquals(newMaxPoolSize1, executor.getMaximumPoolSize());
+    }
+
+    @Test
+    public void testGreater(){
+        // Test when the new core pool size is greater than the original maximum pool size.
+        int newCorePoolSize2 = 8;
+        int newMaxPoolSize2 = 10;
+        ThreadPoolExecutorUtil.safeSetPoolSize(executor, newCorePoolSize2, newMaxPoolSize2);
+        Assert.assertEquals(newCorePoolSize2, executor.getCorePoolSize());
+        Assert.assertEquals(newMaxPoolSize2, executor.getMaximumPoolSize());
+    }
+
+    @Test
+    public void testLess(){
+        // Test when the new core pool size is less than the original maximum pool size.
+        int newCorePoolSize3 = 3;
+        int newMaxPoolSize3 = 5;
+        ThreadPoolExecutorUtil.safeSetPoolSize(executor, newCorePoolSize3, newMaxPoolSize3);
+        Assert.assertEquals(newCorePoolSize3, executor.getCorePoolSize());
+        Assert.assertEquals(newMaxPoolSize3, executor.getMaximumPoolSize());
+    }
+
+    @Test
+    public void testException(){
+        // Test when the new core pool size is greater than the new maximum pool size, which should throw an IllegalArgumentException.
+        int newCorePoolSize4 = 6;
+        int newMaxPoolSize4 = 4;
+        try {
+            ThreadPoolExecutorUtil.safeSetPoolSize(executor, newCorePoolSize4, newMaxPoolSize4);
+        } catch (IllegalArgumentException e) {
+            // Expected to throw an exception.
+            Assert.assertEquals("newCorePoolSize must be smaller than newMaximumPoolSize", e.getMessage());
+        }
+    }
+}