Re-enable support for invalid Expires attributes in MockCookie

Changes introduced in commit 9b2087618b
caused a regression for Cookie support in MockHttpServletResponse.
Specifically, an Expires attribute that cannot be parsed using
`ZonedDateTime.parse()` now results in an exception; whereas,
previously an entry such as `Expires=0` was allowed.

This commit fixes this issue in MockCookie by catching and ignoring any
DateTimeException thrown while attempting to parse an Expires attribute.

Closes gh-23911

spring-test/src/test/java/org/springframework/mock/web/MockCookieTests.java

@@ -20,6 +20,8 @@ import java.time.ZonedDateTime;
 import java.time.format.DateTimeFormatter;
 
 import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.ValueSource;
 
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.assertj.core.api.Assertions.assertThatIllegalArgumentException;
@@ -79,6 +81,15 @@ class MockCookieTests {
 		assertThat(cookie.getSameSite()).isEqualTo("Lax");
 	}
 
+	@ParameterizedTest
+	@ValueSource(strings = {"0", "bogus"})
+	void parseHeaderWithInvalidExpiresAttribute(String expiresValue) {
+		MockCookie cookie = MockCookie.parse("SESSION=123; Expires=" + expiresValue);
+
+		assertCookie(cookie, "SESSION", "123");
+		assertThat(cookie.getExpires()).isNull();
+	}
+
 	private void assertCookie(MockCookie cookie, String name, String value) {
 		assertThat(cookie.getName()).isEqualTo(name);
 		assertThat(cookie.getValue()).isEqualTo(value);

spring-test/src/test/java/org/springframework/mock/web/MockHttpServletResponseTests.java

@@ -362,6 +362,20 @@ class MockHttpServletResponseTests {
 		assertThat(response.getHeader(HttpHeaders.SET_COOKIE)).isEqualTo(cookieValue);
 	}
 
+	/**
+	 * @since 5.1.12
+	 */
+	@Test
+	void setCookieHeaderWithZeroExpiresAttribute() {
+		String cookieValue = "SESSION=123; Path=/; Max-Age=100; Expires=0";
+		response.setHeader(HttpHeaders.SET_COOKIE, cookieValue);
+		assertNumCookies(1);
+		String header = response.getHeader(HttpHeaders.SET_COOKIE);
+		assertThat(header).isNotEqualTo(cookieValue);
+		// We don't assert the actual Expires value since it is based on the current time.
+		assertThat(header).startsWith("SESSION=123; Path=/; Max-Age=100; Expires=");
+	}
+
 	@Test
 	void addCookieHeader() {
 		response.addHeader(HttpHeaders.SET_COOKIE, "SESSION=123; Path=/; Secure; HttpOnly; SameSite=Lax");
@@ -386,6 +400,20 @@ class MockHttpServletResponseTests {
 		assertThat(response.getHeader(HttpHeaders.SET_COOKIE)).isEqualTo(cookieValue);
 	}
 
+	/**
+	 * @since 5.1.12
+	 */
+	@Test
+	void addCookieHeaderWithZeroExpiresAttribute() {
+		String cookieValue = "SESSION=123; Path=/; Max-Age=100; Expires=0";
+		response.addHeader(HttpHeaders.SET_COOKIE, cookieValue);
+		assertNumCookies(1);
+		String header = response.getHeader(HttpHeaders.SET_COOKIE);
+		assertThat(header).isNotEqualTo(cookieValue);
+		// We don't assert the actual Expires value since it is based on the current time.
+		assertThat(header).startsWith("SESSION=123; Path=/; Max-Age=100; Expires=");
+	}
+
 	@Test
 	void addCookie() {
 		MockCookie mockCookie = new MockCookie("SESSION", "123");