Apply SingleSpaceSeparator Checkstyle module

This commit also fixes its violations.

Closes gh-31469

spring-context/src/test/java/org/springframework/aop/aspectj/autoproxy/spr3064/SPR3064Tests.java

@@ -39,7 +39,7 @@ class SPR3064Tests {
 		ClassPathXmlApplicationContext ctx =
 			new ClassPathXmlApplicationContext(getClass().getSimpleName() + ".xml", getClass());
 
-		Service service  = ctx.getBean(Service.class);
+		Service service = ctx.getBean(Service.class);
 		assertThatRuntimeException()
 			.isThrownBy(service::serveMe)
 			.withMessage("advice invoked");

spring-context/src/test/java/org/springframework/aop/framework/autoproxy/BeanNameAutoProxyCreatorTests.java

@@ -166,7 +166,7 @@ class BeanNameAutoProxyCreatorTests {
 	}
 
 
-	private void jdkAssertions(ITestBean tb, int nopInterceptorCount)  {
+	private void jdkAssertions(ITestBean tb, int nopInterceptorCount) {
 		NopInterceptor nop = (NopInterceptor) beanFactory.getBean("nopInterceptor");
 		assertThat(nop.getCount()).isEqualTo(0);
 		assertThat(AopUtils.isJdkDynamicProxy(tb)).isTrue();

spring-context/src/test/java/org/springframework/beans/factory/xml/XmlBeanFactoryTestTypes.java

@@ -418,7 +418,7 @@ abstract class OverrideOneMethod extends MethodReplaceCandidate implements Overr
 
 	@Override
 	public String replaceMe(String someParam) {
-		return "replaceMe:"  + someParam;
+		return "replaceMe:" + someParam;
 	}
 }
 

spring-context/src/test/java/org/springframework/cache/interceptor/ExpressionEvaluatorTests.java

@@ -121,7 +121,7 @@ public class ExpressionEvaluatorTests {
 		EvaluationContext context = createEvaluationContext(CacheOperationExpressionEvaluator.RESULT_UNAVAILABLE);
 		assertThatExceptionOfType(VariableNotAvailableException.class).isThrownBy(() ->
 				new SpelExpressionParser().parseExpression("#result").getValue(context))
-			.satisfies(ex ->  assertThat(ex.getName()).isEqualTo("result"));
+			.satisfies(ex -> assertThat(ex.getName()).isEqualTo("result"));
 	}
 
 	@Test

spring-context/src/test/java/org/springframework/context/annotation/configuration/Spr10744Tests.java

@@ -122,7 +122,7 @@ public class Spr10744Tests {
 	static class MyTestConfiguration extends MyConfiguration {
 
 		@Bean
-		@Scope(value = "myTestScope",  proxyMode = ScopedProxyMode.TARGET_CLASS)
+		@Scope(value = "myTestScope", proxyMode = ScopedProxyMode.TARGET_CLASS)
 		@Override
 		public Foo foo() {
 			return new Foo();

spring-context/src/test/java/org/springframework/context/annotation/spr12334/Spr12334Tests.java

@@ -69,7 +69,7 @@ class Spr12334Tests {
 		private static AtomicInteger scanned = new AtomicInteger();
 
 		@Override
-		public void registerBeanDefinitions(AnnotationMetadata metadata, BeanDefinitionRegistry registry)  {
+		public void registerBeanDefinitions(AnnotationMetadata metadata, BeanDefinitionRegistry registry) {
 			if (scanned.get() > 0) {
 				throw new IllegalStateException("Already scanned");
 			}

spring-context/src/test/java/org/springframework/context/annotation4/FactoryMethodComponent.java

@@ -37,7 +37,7 @@ public class FactoryMethodComponent {
 
 	private int i;
 
-	public static TestBean nullInstance()  {
+	public static TestBean nullInstance() {
 		return null;
 	}
 

spring-context/src/test/java/org/springframework/context/support/DefaultLifecycleProcessorTests.java

@@ -677,7 +677,7 @@ class DefaultLifecycleProcessorTests {
 			return new TestLifecycleBean(null, stoppedBeans);
 		}
 
-		private TestLifecycleBean(CopyOnWriteArrayList<Lifecycle> startedBeans,  CopyOnWriteArrayList<Lifecycle> stoppedBeans) {
+		private TestLifecycleBean(CopyOnWriteArrayList<Lifecycle> startedBeans, CopyOnWriteArrayList<Lifecycle> stoppedBeans) {
 			this.startedBeans = startedBeans;
 			this.stoppedBeans = stoppedBeans;
 		}

spring-context/src/test/java/org/springframework/context/support/GenericApplicationContextTests.java

@@ -652,7 +652,7 @@ class GenericApplicationContextTests {
 		}
 	}
 
-	static class BeanB implements ApplicationContextAware  {
+	static class BeanB implements ApplicationContextAware {
 
 		ApplicationContext applicationContext;
 

spring-context/src/test/java/org/springframework/jmx/support/JmxUtilsTests.java

@@ -58,7 +58,7 @@ class JmxUtilsTests {
 	}
 
 	@Test
-	void isMBeanWithDynamicMBean()  {
+	void isMBeanWithDynamicMBean() {
 		DynamicMBean mbean = new TestDynamicMBean();
 		assertThat(JmxUtils.isMBean(mbean.getClass())).as("Dynamic MBean not detected correctly").isTrue();
 	}
@@ -76,24 +76,24 @@ class JmxUtilsTests {
 	}
 
 	@Test
-	void notAnMBean()  {
+	void notAnMBean() {
 		assertThat(JmxUtils.isMBean(Object.class)).as("Object incorrectly identified as an MBean").isFalse();
 	}
 
 	@Test
-	void simpleMBean()  {
+	void simpleMBean() {
 		Foo foo = new Foo();
 		assertThat(JmxUtils.isMBean(foo.getClass())).as("Simple MBean not detected correctly").isTrue();
 	}
 
 	@Test
-	void simpleMXBean()  {
+	void simpleMXBean() {
 		FooX foo = new FooX();
 		assertThat(JmxUtils.isMBean(foo.getClass())).as("Simple MXBean not detected correctly").isTrue();
 	}
 
 	@Test
-	void simpleMBeanThroughInheritance()  {
+	void simpleMBeanThroughInheritance() {
 		Bar bar = new Bar();
 		Abc abc = new Abc();
 		assertThat(JmxUtils.isMBean(bar.getClass())).as("Simple MBean (through inheritance) not detected correctly").isTrue();

spring-context/src/test/java/org/springframework/scheduling/support/CronExpressionTests.java

@@ -1357,7 +1357,7 @@ class CronExpressionTests {
 	@Test
 	public void various() {
 		CronExpression cronExpression = CronExpression.parse("3-57 13-28 17,18 1,15 3-12 6#1");
-		LocalDateTime last =     LocalDateTime.of(2022, 9, 15, 17, 44, 11);
+		LocalDateTime last = LocalDateTime.of(2022, 9, 15, 17, 44, 11);
 		LocalDateTime expected = LocalDateTime.of(2022, 10, 1, 17, 13, 3);
 		LocalDateTime actual = cronExpression.next(last);
 		assertThat(actual).isNotNull();