Polishing

Closes gh-26675

Author: Rebwon

spring-web/src/main/java/org/springframework/http/ResponseEntity.java

@@ -186,7 +186,7 @@ public int hashCode() {
 	@Override
 	public String toString() {
 		StringBuilder builder = new StringBuilder("<");
-		builder.append(this.status.toString());
+		builder.append(this.status);
 		if (this.status instanceof HttpStatus) {
 			builder.append(' ');
 			builder.append(((HttpStatus) this.status).getReasonPhrase());

spring-web/src/test/java/org/springframework/web/server/session/HeaderWebSessionIdResolverTests.java

@@ -16,6 +16,7 @@
 package org.springframework.web.server.session;
 
 import java.util.Arrays;
+import java.util.Collections;
 import java.util.List;
 
 import org.junit.jupiter.api.BeforeEach;
@@ -49,7 +50,7 @@ public void setUp() {
 	public void expireWhenValidThenSetsEmptyHeader() {
 		this.idResolver.expireSession(this.exchange);
 
-		assertThat(this.exchange.getResponse().getHeaders().get(HeaderWebSessionIdResolver.DEFAULT_HEADER_NAME)).isEqualTo(Arrays.asList(""));
+		assertThat(this.exchange.getResponse().getHeaders().get(HeaderWebSessionIdResolver.DEFAULT_HEADER_NAME)).isEqualTo(Collections.singletonList(""));
 	}
 
 	@Test
@@ -58,7 +59,7 @@ public void expireWhenMultipleInvocationThenSetsSingleEmptyHeader() {
 
 		this.idResolver.expireSession(this.exchange);
 
-		assertThat(this.exchange.getResponse().getHeaders().get(HeaderWebSessionIdResolver.DEFAULT_HEADER_NAME)).isEqualTo(Arrays.asList(""));
+		assertThat(this.exchange.getResponse().getHeaders().get(HeaderWebSessionIdResolver.DEFAULT_HEADER_NAME)).isEqualTo(Collections.singletonList(""));
 	}
 
 	@Test
@@ -67,7 +68,7 @@ public void expireWhenAfterSetSessionIdThenSetsEmptyHeader() {
 
 		this.idResolver.expireSession(this.exchange);
 
-		assertThat(this.exchange.getResponse().getHeaders().get(HeaderWebSessionIdResolver.DEFAULT_HEADER_NAME)).isEqualTo(Arrays.asList(""));
+		assertThat(this.exchange.getResponse().getHeaders().get(HeaderWebSessionIdResolver.DEFAULT_HEADER_NAME)).isEqualTo(Collections.singletonList(""));
 	}
 
 	@Test
@@ -76,7 +77,7 @@ public void setSessionIdWhenValidThenSetsHeader() {
 
 		this.idResolver.setSessionId(this.exchange, id);
 
-		assertThat(this.exchange.getResponse().getHeaders().get(HeaderWebSessionIdResolver.DEFAULT_HEADER_NAME)).isEqualTo(Arrays.asList(id));
+		assertThat(this.exchange.getResponse().getHeaders().get(HeaderWebSessionIdResolver.DEFAULT_HEADER_NAME)).isEqualTo(Collections.singletonList(id));
 	}
 
 	@Test
@@ -86,7 +87,7 @@ public void setSessionIdWhenMultipleThenSetsSingleHeader() {
 
 		this.idResolver.setSessionId(this.exchange, id);
 
-		assertThat(this.exchange.getResponse().getHeaders().get(HeaderWebSessionIdResolver.DEFAULT_HEADER_NAME)).isEqualTo(Arrays.asList(id));
+		assertThat(this.exchange.getResponse().getHeaders().get(HeaderWebSessionIdResolver.DEFAULT_HEADER_NAME)).isEqualTo(Collections.singletonList(id));
 	}
 
 	@Test
@@ -97,13 +98,13 @@ public void setSessionIdWhenCustomHeaderNameThenSetsHeader() {
 
 		this.idResolver.setSessionId(this.exchange, id);
 
-		assertThat(this.exchange.getResponse().getHeaders().get(headerName)).isEqualTo(Arrays.asList(id));
+		assertThat(this.exchange.getResponse().getHeaders().get(headerName)).isEqualTo(Collections.singletonList(id));
 	}
 
 	@Test
 	public void setSessionIdWhenNullIdThenIllegalArgumentException() {
 		assertThatIllegalArgumentException().isThrownBy(() ->
-				this.idResolver.setSessionId(this.exchange, (String) null));
+				this.idResolver.setSessionId(this.exchange, null));
 	}
 
 	@Test
@@ -121,7 +122,7 @@ public void resolveSessionIdsWhenIdThenIdFound() {
 
 		List<String> ids = this.idResolver.resolveSessionIds(this.exchange);
 
-		assertThat(ids).isEqualTo(Arrays.asList(id));
+		assertThat(ids).isEqualTo(Collections.singletonList(id));
 	}
 
 	@Test