Add test for SharedResource

testing/trino-testing-services/src/test/java/io/trino/testng/services/TestSharedResource.java

@@ -0,0 +1,82 @@
+/*
+ * Licensed 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 io.trino.testng.services;
+
+import io.trino.testing.SharedResource;
+import org.testng.annotations.Test;
+
+import java.util.concurrent.Callable;
+import java.util.concurrent.atomic.AtomicLong;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+public class TestSharedResource
+{
+    @Test
+    public void testSharedResourceReusing()
+            throws Exception
+    {
+        MockFactory factory = new MockFactory();
+        SharedResource<AutoCloseable> sharedResource = new SharedResource<>(factory);
+
+        try (SharedResource.Lease<AutoCloseable> lease = sharedResource.getInstanceLease();
+                SharedResource.Lease<AutoCloseable> lease1 = sharedResource.getInstanceLease()) {
+            assertThat(lease.get()).isNotNull();
+            assertThat(lease1.get()).isNotNull();
+        }
+        assertThat(factory.getCreationCount()).isOne();
+        assertThat(factory.getDestructionCount()).isOne();
+    }
+
+    @Test
+    public void testSharedResourceNotReusing()
+            throws Exception
+    {
+        MockFactory factory = new MockFactory();
+        SharedResource<AutoCloseable> sharedResource = new SharedResource<>(factory);
+
+        for (int i = 0; i < 10; i++) {
+            try (SharedResource.Lease<AutoCloseable> lease = sharedResource.getInstanceLease()) {
+                assertThat(lease.get()).isNotNull();
+            }
+        }
+        assertThat(factory.getCreationCount()).isEqualTo(10);
+        assertThat(factory.getDestructionCount()).isEqualTo(10);
+    }
+
+    private static class MockFactory
+            implements Callable<AutoCloseable>
+    {
+        private final AtomicLong creationCounter = new AtomicLong();
+        private final AtomicLong destructionCounter = new AtomicLong();
+
+        public long getCreationCount()
+        {
+            return creationCounter.get();
+        }
+
+        public long getDestructionCount()
+        {
+            return destructionCounter.get();
+        }
+
+        @Override
+        public AutoCloseable call()
+                throws Exception
+        {
+            creationCounter.incrementAndGet();
+            return destructionCounter::incrementAndGet;
+        }
+    }
+}