MockServerHttpRequest and Response set cookie headers

Issue: SPR-15522

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

@@ -71,4 +71,9 @@ public class HttpCookie {
 		return (this.name.equalsIgnoreCase(otherCookie.getName()));
 	}
 
+	@Override
+	public String toString() {
+		return this.name + '=' + this.value;
+	}
+
 }

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

@@ -21,6 +21,7 @@ import java.time.Duration;
 import org.springframework.lang.Nullable;
 import org.springframework.util.Assert;
 import org.springframework.util.ObjectUtils;
+import org.springframework.util.StringUtils;
 
 /**
  * An {@code HttpCookie} subclass with the additional attributes allowed in
@@ -125,6 +126,34 @@ public final class ResponseCookie extends HttpCookie {
 		return result;
 	}
 
+	@Override
+	public String toString() {
+		StringBuilder sb = new StringBuilder();
+		sb.append(getName()).append('=').append(getValue());
+		if (StringUtils.hasText(getPath())) {
+			sb.append("; Path=").append(getPath());
+		}
+		if (StringUtils.hasText(this.domain)) {
+			sb.append("; Domain=").append(this.domain);
+		}
+		if (!this.maxAge.isNegative()) {
+			sb.append("; Max-Age=").append(this.maxAge);
+			sb.append("; Expires=");
+			HttpHeaders headers = new HttpHeaders();
+			long seconds = this.maxAge.getSeconds();
+			headers.setExpires(seconds > 0 ? System.currentTimeMillis() + seconds : 0);
+			sb.append(headers.getFirst(HttpHeaders.EXPIRES));
+		}
+
+		if (this.secure) {
+			sb.append("; Secure");
+		}
+		if (this.httpOnly) {
+			sb.append("; HttpOnly");
+		}
+		return sb.toString();
+	}
+
 
 	/**
 	 * Factory method to obtain a builder for a server-defined cookie that starts