Apply SingleSpaceSeparator Checkstyle module

This commit also fixes its violations.

Closes gh-31469

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);
 	}