Apply SingleSpaceSeparator Checkstyle module

This commit also fixes its violations.

Closes gh-31469

spring-test/src/main/java/org/springframework/mock/web/MockHttpServletRequest.java

@@ -726,7 +726,7 @@ public class MockHttpServletRequest implements HttpServletRequest {
 		}
 		else if (this.inputStream != null) {
 			throw new IllegalStateException(
-					"Cannot call getReader() after getInputStream() has already been called for the current request")			;
+					"Cannot call getReader() after getInputStream() has already been called for the current request");
 		}
 
 		if (this.content != null) {

spring-test/src/main/java/org/springframework/test/context/support/DynamicValuesPropertySource.java

@@ -30,7 +30,7 @@ import org.springframework.util.StringUtils;
  * @author Sam Brannen
  * @since 5.2.5
  */
-class DynamicValuesPropertySource extends EnumerablePropertySource<Map<String, Supplier<Object>>>  {
+class DynamicValuesPropertySource extends EnumerablePropertySource<Map<String, Supplier<Object>>> {
 
 	DynamicValuesPropertySource(String name, Map<String, Supplier<Object>> valueSuppliers) {
 		super(name, valueSuppliers);

spring-test/src/main/java/org/springframework/test/util/XmlExpectationsHelper.java

@@ -51,7 +51,7 @@ public class XmlExpectationsHelper {
 		assertThat("Body content", document, matcher);
 	}
 
-	private Document parseXmlString(String xml) throws Exception  {
+	private Document parseXmlString(String xml) throws Exception {
 		DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
 		factory.setNamespaceAware(true);
 		DocumentBuilder documentBuilder = factory.newDocumentBuilder();

spring-test/src/main/java/org/springframework/test/web/reactive/server/DefaultWebTestClient.java

@@ -478,7 +478,7 @@ class DefaultWebTestClient implements WebTestClient {
 			return new DefaultBodyContentSpec(entityResult);
 		}
 
-		private  <B> EntityExchangeResult<B> initEntityExchangeResult(@Nullable B body) {
+		private <B> EntityExchangeResult<B> initEntityExchangeResult(@Nullable B body) {
 			EntityExchangeResult<B> result = new EntityExchangeResult<>(this.exchangeResult, body);
 			result.assertWithDiagnostics(() -> this.entityResultConsumer.accept(result));
 			return result;

spring-test/src/main/java/org/springframework/test/web/reactive/server/WiretapConnector.java

@@ -73,7 +73,7 @@ class WiretapConnector implements ClientHttpConnector {
 					requestRef.set(wrapped);
 					return requestCallback.apply(wrapped);
 				})
-				.map(response ->  {
+				.map(response -> {
 					WiretapClientHttpRequest wrappedRequest = requestRef.get();
 					String header = WebTestClient.WEBTESTCLIENT_REQUEST_ID;
 					String requestId = wrappedRequest.getHeaders().getFirst(header);

spring-test/src/test/java/org/springframework/test/context/cache/AotMergedContextConfigurationTests.java

@@ -54,7 +54,7 @@ class AotMergedContextConfigurationTests {
 
 
 	@Test
-	void testEquals()  {
+	void testEquals() {
 		assertThat(aotMergedConfig1).isEqualTo(aotMergedConfig1);
 		assertThat(aotMergedConfig1).isEqualTo(aotMergedConfig2);
 

spring-test/src/test/java/org/springframework/test/context/jdbc/BeforeTestClassSqlScriptsTests.java

@@ -61,7 +61,7 @@ class BeforeTestClassSqlScriptsTests extends AbstractTransactionalTests {
 	}
 
 	@Nested
-	class NestedBeforeTestClassSqlScriptsTests  {
+	class NestedBeforeTestClassSqlScriptsTests {
 
 		@Test
 		void classLevelScriptsHaveBeenRun() {

spring-test/src/test/java/org/springframework/test/context/jdbc/TransactionalInlinedStatementsSqlScriptsTests.java

@@ -35,7 +35,7 @@ import org.springframework.test.context.junit.jupiter.SpringJUnitConfig;
 @SpringJUnitConfig(EmptyDatabaseConfig.class)
 @TestMethodOrder(MethodOrderer.OrderAnnotation.class)
 @Sql(
-	scripts    = "schema.sql",
+	scripts = "schema.sql",
 	statements = "INSERT INTO user VALUES('Dilbert')"
 )
 @DirtiesContext

spring-test/src/test/java/org/springframework/test/web/client/DefaultRequestExpectationTests.java

@@ -80,7 +80,7 @@ class DefaultRequestExpectationTests {
 
 
 	private ClientHttpRequest createRequest() {
-		return new MockClientHttpRequest(HttpMethod.GET,  URI.create("/foo"));
+		return new MockClientHttpRequest(HttpMethod.GET, URI.create("/foo"));
 	}
 
 }

spring-test/src/test/java/org/springframework/test/web/client/UnorderedRequestExpectationManagerTests.java

@@ -120,7 +120,7 @@ class UnorderedRequestExpectationManagerTests {
 
 
 	private ClientHttpRequest createRequest(HttpMethod method, String url) {
-		return new MockClientHttpRequest(method,  URI.create(url));
+		return new MockClientHttpRequest(method, URI.create(url));
 	}
 
 }

spring-test/src/test/java/org/springframework/test/web/servlet/result/JsonPathResultMatchersTests.java

@@ -305,7 +305,7 @@ class JsonPathResultMatchersTests {
 		MockHttpServletResponse response = new MockHttpServletResponse();
 		response.addHeader("Content-Type", "application/json");
 		response.getWriter().print(new String("test".getBytes(ISO_8859_1)));
-		StubMvcResult result =  new StubMvcResult(null, null, null, null, null, null, response);
+		StubMvcResult result = new StubMvcResult(null, null, null, null, null, null, response);
 
 		assertThatExceptionOfType(AssertionError.class).isThrownBy(() ->
 				new JsonPathResultMatchers("$.str").prefix("prefix").value("foo").match(result));

spring-test/src/test/java/org/springframework/test/web/servlet/setup/StandaloneMockMvcBuilderTests.java

@@ -96,7 +96,7 @@ class StandaloneMockMvcBuilderTests {
 	void applicationContextAttribute() {
 		TestStandaloneMockMvcBuilder builder = new TestStandaloneMockMvcBuilder(new PlaceholderController());
 		builder.addPlaceholderValue("sys.login.ajax", "/foo");
-		WebApplicationContext  wac = builder.initWebAppContext();
+		WebApplicationContext wac = builder.initWebAppContext();
 		assertThat(WebApplicationContextUtils.getRequiredWebApplicationContext(wac.getServletContext())).isEqualTo(wac);
 	}