[ISSUE apache#4540] Add unit test for ThreadUtils (apache#5111)

Author: melisolmez

eventmesh-common/src/test/java/org/apache/eventmesh/common/utils/ThreadUtilsTest.java

@@ -0,0 +1,118 @@
+/*
+ * 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 org.apache.eventmesh.common.utils;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import java.util.concurrent.TimeUnit;
+
+import org.junit.jupiter.api.Test;
+
+class ThreadUtilsTest {
+
+    @Test
+    void testRandomPauseBetweenMinAndMax() {
+
+        long min = 1000;
+        long max = 5000;
+
+        long start = System.currentTimeMillis();
+        ThreadUtils.randomPause(min, max, TimeUnit.MILLISECONDS);
+        long end = System.currentTimeMillis();
+
+        long pause = end - start;
+
+        assertTrue(pause >= min && pause <= max, "Pause time should be between min and max");
+    }
+
+    @Test
+    void testRandomPauseWithInterruption() {
+
+        Thread.currentThread().interrupt();
+        ThreadUtils.randomPause(1000, 2000, TimeUnit.MILLISECONDS);
+        assertTrue(Thread.currentThread().isInterrupted());
+    }
+
+    @Test
+    void testDeprecatedSleep() {
+
+        ThreadUtils.sleep(1000);
+        assertTrue(true, "Method should execute without any exception");
+    }
+
+    @Test
+    void testSleepWithTimeOutAndTimeUnit() throws InterruptedException {
+
+        ThreadUtils.sleepWithThrowException(5000, TimeUnit.MILLISECONDS);
+        assertTrue(true, "Method should execute without any exception");
+    }
+
+    @Test
+    void testSleepWithNullTimeUnit() throws InterruptedException {
+
+        ThreadUtils.sleepWithThrowException(5000, null);
+        assertTrue(true, "Method should not throw any exception with null TimeUnit");
+    }
+
+    @Test
+    void testSleepWithThrowExceptionInterruption() {
+        Thread.currentThread().interrupt();
+
+        assertThrows(InterruptedException.class, () -> {
+            ThreadUtils.sleepWithThrowException(5000, TimeUnit.MILLISECONDS);
+        });
+    }
+
+    @Test
+    void testGetPIDWithRealProcessId() {
+
+        long pid = ThreadUtils.getPID();
+        assertTrue(pid > 0);
+
+        long cashedPId = ThreadUtils.getPID();
+        assertEquals(pid, cashedPId);
+    }
+
+    @Test
+    void testGetPIDWithMultiThread() throws InterruptedException {
+
+        final long[] pid1 = new long[1];
+        final long[] pid2 = new long[1];
+
+        Thread thread1 = new Thread(() -> {
+            pid1[0] = ThreadUtils.getPID();
+            assertTrue(pid1[0] > 0);
+        });
+
+        Thread thread2 = new Thread(() -> {
+            pid2[0] = ThreadUtils.getPID();
+            assertTrue(pid2[0] > 0);
+        });
+
+        thread1.start();
+        thread2.start();
+
+        thread1.join();
+        thread2.join();
+
+        assertEquals(pid1[0], pid2[0]);
+    }
+}