Add tests for TransactionAwareCacheDecorator

This commit adds tests for TransactionAwareCacheDecorator. In
particular, the put/evict behaviour when the operation is invoked in
the course of Spring-managed transaction.

spring-context-support/src/test/java/org/springframework/cache/transaction/TransactionAwareCacheDecoratorTests.java

@@ -0,0 +1,121 @@
+/*
+ * Copyright 2002-2014 the original author or authors.
+ *
+ * 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 org.springframework.cache.transaction;
+
+import static org.junit.Assert.*;
+
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.ExpectedException;
+import org.springframework.cache.Cache;
+import org.springframework.cache.concurrent.ConcurrentMapCache;
+import org.springframework.tests.transaction.CallCountingTransactionManager;
+import org.springframework.transaction.PlatformTransactionManager;
+import org.springframework.transaction.TransactionDefinition;
+import org.springframework.transaction.TransactionException;
+import org.springframework.transaction.TransactionStatus;
+import org.springframework.transaction.interceptor.DefaultTransactionAttribute;
+import org.springframework.transaction.support.AbstractPlatformTransactionManager;
+import org.springframework.transaction.support.DefaultTransactionStatus;
+
+/**
+ * @author Stephane Nicoll
+ */
+public class TransactionAwareCacheDecoratorTests {
+
+	@Rule
+	public final ExpectedException thrown = ExpectedException.none();
+
+	private final PlatformTransactionManager txManager = new CallCountingTransactionManager();
+
+	@Test
+	public void createWithNullTarget() {
+		thrown.expect(IllegalArgumentException.class);
+		new TransactionAwareCacheDecorator(null);
+	}
+
+	@Test
+	public void regularOperationsOnTarget() {
+		Cache target = new ConcurrentMapCache("testCache");
+		Cache cache = new TransactionAwareCacheDecorator(target);
+		assertEquals(target.getName(), cache.getName());
+		assertEquals(target.getNativeCache(), cache.getNativeCache());
+
+		Object key = new Object();
+		target.put(key, "123");
+		assertEquals("123", cache.get(key).get());
+		assertEquals("123", cache.get(key, String.class));
+
+		cache.clear();
+		assertNull(target.get(key));
+	}
+
+	@Test
+	public void putNonTransactional() {
+		Cache target = new ConcurrentMapCache("testCache");
+		Cache cache = new TransactionAwareCacheDecorator(target);
+
+		Object key = new Object();
+		cache.put(key, "123");
+		assertEquals("123", target.get(key, String.class));
+	}
+
+	@Test
+	public void putTransactional() {
+		Cache target = new ConcurrentMapCache("testCache");
+		Cache cache = new TransactionAwareCacheDecorator(target);
+
+		TransactionStatus status = txManager.getTransaction(new DefaultTransactionAttribute(
+				TransactionDefinition.PROPAGATION_REQUIRED));
+
+		Object key = new Object();
+		cache.put(key, "123");
+		assertNull(target.get(key));
+		txManager.commit(status);
+
+		assertEquals("123", target.get(key, String.class));
+	}
+
+	@Test
+	public void evictNonTransactional() {
+		Cache target = new ConcurrentMapCache("testCache");
+		Cache cache = new TransactionAwareCacheDecorator(target);
+		Object key = new Object();
+		cache.put(key, "123");
+
+		cache.evict(key);
+		assertNull(target.get(key));
+	}
+
+	@Test
+	public void evictTransactional() {
+		Cache target = new ConcurrentMapCache("testCache");
+		Cache cache = new TransactionAwareCacheDecorator(target);
+		Object key = new Object();
+		cache.put(key, "123");
+
+
+		TransactionStatus status = txManager.getTransaction(new DefaultTransactionAttribute(
+				TransactionDefinition.PROPAGATION_REQUIRED));
+		cache.evict(key);
+		assertEquals("123", target.get(key, String.class));
+		txManager.commit(status);
+
+		assertNull(target.get(key));
+	}
+
+}