test: add FastThreadPoolExecutorTest (#1317)

* test: add FastThreadPoolExecutorTest

* test: add FastThreadPoolExecutorTest

threadpool/core/src/test/java/cn/hippo4j/core/executor/support/FastThreadPoolExecutorTest.java

@@ -0,0 +1,98 @@
+/*
+ * 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.core.executor.support;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+import java.util.concurrent.ThreadPoolExecutor;
+import java.util.concurrent.TimeUnit;
+
+/**
+ * test for {@link FastThreadPoolExecutor}
+ */
+public class FastThreadPoolExecutorTest {
+
+    private final static int corePoolSize = 1;
+
+    private final static int capacity = 1;
+
+    private final TaskQueue<Runnable> taskQueue = new TaskQueue<>(capacity);
+
+    private final FastThreadPoolExecutor fastThreadPoolExecutor = new FastThreadPoolExecutor(corePoolSize,
+            corePoolSize,
+            10,
+            TimeUnit.SECONDS,
+            taskQueue,
+            Thread::new,
+            new ThreadPoolExecutor.AbortPolicy());
+
+    {
+        taskQueue.setExecutor(fastThreadPoolExecutor);
+    }
+
+    @Test
+    void testSubmittedTaskCount() {
+        fastThreadPoolExecutor.execute(() -> {
+            try {
+                TimeUnit.SECONDS.sleep(2);
+            } catch (InterruptedException ignored) {
+            }
+        });
+
+        try {
+            TimeUnit.SECONDS.sleep(1);
+        } catch (InterruptedException ignored) {
+        }
+        Assertions.assertEquals(1, fastThreadPoolExecutor.getSubmittedTaskCount());
+
+        try {
+            TimeUnit.SECONDS.sleep(1);
+        } catch (InterruptedException ignored) {
+        }
+        Assertions.assertEquals(0, fastThreadPoolExecutor.getSubmittedTaskCount());
+
+        // exception
+        int expected = 0;
+        for (int i = 0; i <= (corePoolSize + capacity); i++) {
+            expected++;
+            try {
+                fastThreadPoolExecutor.execute(() -> {
+                    synchronized (fastThreadPoolExecutor) {
+                        try {
+                            fastThreadPoolExecutor.wait();
+                        } catch (InterruptedException ignored) {
+                        }
+                    }
+                });
+            } catch (Exception e) {
+                expected--;
+            }
+        }
+
+        try {
+            TimeUnit.SECONDS.sleep(1);
+        } catch (InterruptedException ignored) {
+        }
+        Assertions.assertEquals(expected, fastThreadPoolExecutor.getSubmittedTaskCount());
+
+        synchronized (fastThreadPoolExecutor) {
+            fastThreadPoolExecutor.notifyAll();
+        }
+    }
+}