adding testing

.idea/vcs.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$" vcs="Git" />
+  </component>
+</project>
\ No newline at end of file

src/test/java/ThreadPoolTests/testThreadPool.java

+package ThreadPoolTests;
+
+import ThreadPool.ThreadPool;
+import org.junit.Test;
+
+import static org.junit.Assert.fail;
+
+public class testThreadPool {
+    @Test
+    public void testThreadPool() {
+        ThreadPool threadPool = new ThreadPool(3, 10);
+
+        for (int i = 0; i < 10; i++) {
+            int taskNo = i;
+            try {
+                threadPool.execute(() -> {
+                    String message = Thread.currentThread().getName() + ": Task " + taskNo;
+                    System.out.println(message);
+                });
+            } catch (Exception e) {
+                fail("Exception should not be thrown");
+            }
+        }
+
+        threadPool.waitUntilAllTasksFinished(5000);
+
+        threadPool.stop();
+    }
+}