Ignore performance-sensitive tests by default

Make use of the new JUnit functionality introduced in the previous
commit to 'Assume' that perfomance- and timing-sensitive tests should
run only when TestGroup.PERFORMANCE is selected, i.e. when
-PtestGroups="performance" has been provided at the Gradle command line.

The net effect is that these tests are now ignored by default, which
will result in far fewer false-negative CI build failures due to
resource contention and other external factors that cause slowdowns.

We will set up a dedicated performance CI build to run these tests on
an isolated machine, etc.

Issue: SPR-9984

spring-web/src/test/java/org/springframework/web/bind/ServletRequestUtilsTests.java

@@ -19,6 +19,8 @@ package org.springframework.web.bind;
 import static org.junit.Assert.*;
 
 import org.junit.Test;
+import org.springframework.build.junit.Assume;
+import org.springframework.build.junit.TestGroup;
 import org.springframework.mock.web.test.MockHttpServletRequest;
 import org.springframework.util.StopWatch;
 
@@ -399,6 +401,7 @@ public class ServletRequestUtilsTests {
 
 	@Test
 	public void testGetLongParameterWithDefaultValueHandlingIsFastEnough() {
+		Assume.group(TestGroup.PERFORMANCE);
 		MockHttpServletRequest request = new MockHttpServletRequest();
 		StopWatch sw = new StopWatch();
 		sw.start();
@@ -412,6 +415,7 @@ public class ServletRequestUtilsTests {
 
 	@Test
 	public void testGetFloatParameterWithDefaultValueHandlingIsFastEnough() {
+		Assume.group(TestGroup.PERFORMANCE);
 		MockHttpServletRequest request = new MockHttpServletRequest();
 		StopWatch sw = new StopWatch();
 		sw.start();
@@ -425,6 +429,7 @@ public class ServletRequestUtilsTests {
 
 	@Test
 	public void testGetDoubleParameterWithDefaultValueHandlingIsFastEnough() {
+		Assume.group(TestGroup.PERFORMANCE);
 		MockHttpServletRequest request = new MockHttpServletRequest();
 		StopWatch sw = new StopWatch();
 		sw.start();
@@ -438,6 +443,7 @@ public class ServletRequestUtilsTests {
 
 	@Test
 	public void testGetBooleanParameterWithDefaultValueHandlingIsFastEnough() {
+		Assume.group(TestGroup.PERFORMANCE);
 		MockHttpServletRequest request = new MockHttpServletRequest();
 		StopWatch sw = new StopWatch();
 		sw.start();
@@ -451,6 +457,7 @@ public class ServletRequestUtilsTests {
 
 	@Test
 	public void testGetStringParameterWithDefaultValueHandlingIsFastEnough() {
+		Assume.group(TestGroup.PERFORMANCE);
 		MockHttpServletRequest request = new MockHttpServletRequest();
 		StopWatch sw = new StopWatch();
 		sw.start();