Add test for StandardReflectionParameterNameDiscoverer

Added test to StandardReflectionParameterNameDiscoverer that
demonstrates discovering of parameter names on an interface.

Issue: SPR-9643

spring-core/src/test/java/org/springframework/core/StandardReflectionParameterNameDiscoverTests.java

@@ -0,0 +1,51 @@
+/*
+ * Copyright 2002-2013 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.core;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.springframework.util.ReflectionUtils;
+
+import java.lang.reflect.Method;
+
+import static org.hamcrest.CoreMatchers.is;
+import static org.hamcrest.MatcherAssert.assertThat;
+
+
+/**
+ * Tests for StandardReflectionParameterNameDiscoverer
+ *
+ * @author Rob Winch
+ */
+public class StandardReflectionParameterNameDiscoverTests {
+    private ParameterNameDiscoverer parameterNameDiscoverer;
+
+    @Before
+    public void setup() {
+        parameterNameDiscoverer = new StandardReflectionParameterNameDiscoverer();
+    }
+
+    @Test
+    public void getParameterNamesOnInterface() {
+        Method method = ReflectionUtils.findMethod(MessageService.class,"sendMessage", String.class);
+        String[] actualParams = parameterNameDiscoverer.getParameterNames(method);
+        assertThat(actualParams, is(new String[]{"message"}));
+    }
+
+    public interface MessageService {
+        void sendMessage(String message);
+    }
+}