Attempt to repro ReflectionUtils performance issue

Issue: SPR-10197

spring-core/src/test/java/org/springframework/util/ReflectionUtilsTests.java

@@ -16,15 +16,6 @@
 
 package org.springframework.util;
 
-import static org.hamcrest.CoreMatchers.is;
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertFalse;
-import static org.junit.Assert.assertNotNull;
-import static org.junit.Assert.assertNull;
-import static org.junit.Assert.assertThat;
-import static org.junit.Assert.assertTrue;
-import static org.junit.Assert.fail;
-
 import java.lang.reflect.Field;
 import java.lang.reflect.Method;
 import java.lang.reflect.Modifier;
@@ -33,10 +24,18 @@
 import java.util.LinkedList;
 import java.util.List;
 
+import org.hamcrest.Matchers;
+
 import org.junit.Ignore;
 import org.junit.Test;
+
+import org.springframework.tests.Assume;
+import org.springframework.tests.TestGroup;
 import org.springframework.tests.sample.objects.TestObject;
 
+import static org.hamcrest.CoreMatchers.is;
+import static org.junit.Assert.*;
+
 /**
  * @author Rob Harrop
  * @author Juergen Hoeller
@@ -347,6 +346,43 @@ public Integer m1() {
 		assertFalse(ObjectUtils.containsElement(methods, Parent.class.getMethod("m1")));
 	}
 
+	@Test
+	public void getUniqueDeclaredMethods_isFastEnough() {
+		Assume.group(TestGroup.PERFORMANCE);
+
+		@SuppressWarnings("unused")
+		class C {
+			void m00() { } void m01() { } void m02() { } void m03() { } void m04() { }
+			void m05() { } void m06() { } void m07() { } void m08() { } void m09() { }
+			void m10() { } void m11() { } void m12() { } void m13() { } void m14() { }
+			void m15() { } void m16() { } void m17() { } void m18() { } void m19() { }
+			void m20() { } void m21() { } void m22() { } void m23() { } void m24() { }
+			void m25() { } void m26() { } void m27() { } void m28() { } void m29() { }
+			void m30() { } void m31() { } void m32() { } void m33() { } void m34() { }
+			void m35() { } void m36() { } void m37() { } void m38() { } void m39() { }
+			void m40() { } void m41() { } void m42() { } void m43() { } void m44() { }
+			void m45() { } void m46() { } void m47() { } void m48() { } void m49() { }
+			void m50() { } void m51() { } void m52() { } void m53() { } void m54() { }
+			void m55() { } void m56() { } void m57() { } void m58() { } void m59() { }
+			void m60() { } void m61() { } void m62() { } void m63() { } void m64() { }
+			void m65() { } void m66() { } void m67() { } void m68() { } void m69() { }
+			void m70() { } void m71() { } void m72() { } void m73() { } void m74() { }
+			void m75() { } void m76() { } void m77() { } void m78() { } void m79() { }
+			void m80() { } void m81() { } void m82() { } void m83() { } void m84() { }
+			void m85() { } void m86() { } void m87() { } void m88() { } void m89() { }
+			void m90() { } void m91() { } void m92() { } void m93() { } void m94() { }
+			void m95() { } void m96() { } void m97() { } void m98() { } void m99() { }
+		}
+
+		StopWatch sw = new StopWatch();
+		sw.start();
+		Method[] methods = ReflectionUtils.getUniqueDeclaredMethods(C.class);
+		sw.stop();
+		long totalMs = sw.getTotalTimeMillis();
+		assertThat(methods.length, Matchers.greaterThan(100));
+		assertThat(totalMs, Matchers.lessThan(10L));
+	}
+
 	private static class ListSavingMethodCallback implements ReflectionUtils.MethodCallback {
 
 		private List<String> methodNames = new LinkedList<String>();