GH-1304 Fix JsonMapperTest

Resolves #1304

Author: olegz

spring-cloud-function-context/src/test/java/org/springframework/cloud/function/utils/JsonMapperTests.java

@@ -16,15 +16,13 @@
 
 package org.springframework.cloud.function.utils;
 
-import java.lang.reflect.Field;
 import java.nio.charset.StandardCharsets;
 import java.time.ZonedDateTime;
 import java.util.Date;
 import java.util.List;
 import java.util.stream.Stream;
 
 import com.google.gson.Gson;
-import org.junit.jupiter.api.Disabled;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.params.ParameterizedTest;
 import org.junit.jupiter.params.provider.MethodSource;
@@ -41,9 +39,6 @@
 import org.springframework.context.ApplicationContext;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.core.ResolvableType;
-import org.springframework.util.ReflectionUtils;
-
-
 
 import static org.assertj.core.api.Assertions.assertThat;
 
@@ -82,7 +77,6 @@ public void objectNode_isJsonStringRepresentsCollection() {
 
 	// see https://github.com/spring-cloud/spring-cloud-function/issues/1189
 	@Test
-	@Disabled("https://github.com/spring-cloud/spring-cloud-function/issues/1304")
 	public void testJsonDateTimeConversion() {
 		ApplicationContext context = SpringApplication.run(EmptyConfiguration.class);
 		JsonMapper jsonMapper = context.getBean(JsonMapper.class);
@@ -91,16 +85,6 @@ public void testJsonDateTimeConversion() {
 		assertThat(convertedJson).contains("\"zonedDateTime\":\"2024-10-16T16:13:29.964361+02:00\"");
 	}
 
-	@Test
-	public void testKotlinModuleRegistration() throws Exception {
-		ApplicationContext context = SpringApplication.run(EmptyConfiguration.class);
-		JsonMapper jsonMapper = context.getBean(JsonMapper.class);
-		Field mapperField = ReflectionUtils.findField(jsonMapper.getClass(), "mapper");
-		mapperField.setAccessible(true);
-		ObjectMapper mapper = (ObjectMapper) mapperField.get(jsonMapper);
-		//assertThat(mapper.getRegisteredModuleIds()).contains("com.fasterxml.jackson.module.kotlin.KotlinModule");
-	}
-
 	@ParameterizedTest
 	@MethodSource("params")
 	public void vanillaArray(JsonMapper mapper) {