Add test to corner potential bug with @CacheEvict

Cannot yet actually reproduce the issue, but this remains a useful
test case.

Issue: SPR-8934

org.springframework.context/src/test/java/org/springframework/cache/annotation/AnnotationCacheOperationSourceTest.java

@@ -114,6 +114,10 @@ public class AnnotationCacheOperationSourceTest {
 		@EvictBar
 		public void multipleStereotype() {
 		}
+
+		@Caching(cacheable = { @Cacheable(value = "test", key = "a"), @Cacheable(value = "test", key = "b") })
+		public void multipleCaching() {
+		}
 	}
 
 	@Retention(RetentionPolicy.RUNTIME)

org.springframework.context/src/test/java/org/springframework/cache/interceptor/ExpressionEvalutatorTest.java

@@ -0,0 +1,86 @@
+/*
+ * Copyright 2011 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.interceptor;
+
+import static org.junit.Assert.*;
+
+import java.lang.reflect.Method;
+import java.util.Collection;
+import java.util.Iterator;
+
+import org.junit.Test;
+import org.springframework.cache.Cache;
+import org.springframework.cache.annotation.AnnotationCacheOperationSource;
+import org.springframework.cache.annotation.Cacheable;
+import org.springframework.cache.annotation.Caching;
+import org.springframework.cache.concurrent.ConcurrentMapCache;
+import org.springframework.expression.EvaluationContext;
+import org.springframework.util.ReflectionUtils;
+
+import edu.emory.mathcs.backport.java.util.Collections;
+
+public class ExpressionEvalutatorTest {
+	private ExpressionEvaluator eval = new ExpressionEvaluator();
+
+	private AnnotationCacheOperationSource source = new AnnotationCacheOperationSource();
+
+	private Collection<CacheOperation> getOps(String name) {
+		Method method = ReflectionUtils.findMethod(AnnotatedClass.class, name, Object.class, Object.class);
+		return source.getCacheOperations(method, AnnotatedClass.class);
+	}
+
+	@Test
+	public void testMultipleCachingSource() throws Exception {
+		Collection<CacheOperation> ops = getOps("multipleCaching");
+		assertEquals(2, ops.size());
+		Iterator<CacheOperation> it = ops.iterator();
+		CacheOperation next = it.next();
+		assertTrue(next instanceof CacheableOperation);
+		assertTrue(next.getCacheNames().contains("test"));
+		assertEquals("#a", next.getKey());
+		next = it.next();
+		assertTrue(next instanceof CacheableOperation);
+		assertTrue(next.getCacheNames().contains("test"));
+		assertEquals("#b", next.getKey());
+	}
+
+	@Test
+	public void testMultipleCachingEval() throws Exception {
+		AnnotatedClass target = new AnnotatedClass();
+		Method method = ReflectionUtils.findMethod(AnnotatedClass.class, "multipleCaching", Object.class,
+				Object.class);
+		Object[] args = new Object[] { new Object(), new Object() };
+		Collection<Cache> map = Collections.singleton(new ConcurrentMapCache("test"));
+
+		EvaluationContext evalCtx = eval.createEvaluationContext(map, method, args, target, target.getClass());
+		Collection<CacheOperation> ops = getOps("multipleCaching");
+
+		Iterator<CacheOperation> it = ops.iterator();
+
+		Object keyA = eval.key(it.next().getKey(), method, evalCtx);
+		Object keyB = eval.key(it.next().getKey(), method, evalCtx);
+
+		assertEquals(args[0], keyA);
+		assertEquals(args[1], keyB);
+	}
+
+	private static class AnnotatedClass {
+		@Caching(cacheable = { @Cacheable(value = "test", key = "#a"), @Cacheable(value = "test", key = "#b") })
+		public void multipleCaching(Object a, Object b) {
+		}
+	}
+}