Add reflection hints for JsonTesters

Closes gh-32858

spring-boot-project/spring-boot-test-autoconfigure/build.gradle

@@ -94,6 +94,7 @@ dependencies {
 	testImplementation("org.mockito:mockito-core")
 	testImplementation("org.mockito:mockito-junit-jupiter")
 	testImplementation("org.skyscreamer:jsonassert")
+	testImplementation("org.springframework:spring-core-test")
 	testImplementation("org.springframework.hateoas:spring-hateoas")
 	testImplementation("org.springframework.plugin:spring-plugin-core")
 	testImplementation("org.testcontainers:cassandra")

spring-boot-project/spring-boot-test-autoconfigure/src/main/java/org/springframework/boot/test/autoconfigure/json/JsonTestersAutoConfiguration.java

@@ -23,6 +23,11 @@ import com.fasterxml.jackson.databind.ObjectMapper;
 import com.google.gson.Gson;
 import jakarta.json.bind.Jsonb;
 
+import org.springframework.aot.hint.ExecutableMode;
+import org.springframework.aot.hint.MemberCategory;
+import org.springframework.aot.hint.ReflectionHints;
+import org.springframework.aot.hint.RuntimeHints;
+import org.springframework.aot.hint.RuntimeHintsRegistrar;
 import org.springframework.beans.BeanUtils;
 import org.springframework.beans.BeansException;
 import org.springframework.beans.factory.FactoryBean;
@@ -42,6 +47,7 @@ import org.springframework.boot.test.json.JacksonTester;
 import org.springframework.boot.test.json.JsonbTester;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.ImportRuntimeHints;
 import org.springframework.context.annotation.Scope;
 import org.springframework.core.ResolvableType;
 import org.springframework.test.util.ReflectionTestUtils;
@@ -68,6 +74,7 @@ public class JsonTestersAutoConfiguration {
 
 	@Bean
 	@Scope("prototype")
+	@ImportRuntimeHints(BasicJsonTesterRuntimeHints.class)
 	public FactoryBean<BasicJsonTester> basicJsonTesterFactoryBean() {
 		return new JsonTesterFactoryBean<BasicJsonTester, Void>(BasicJsonTester.class, null);
 	}
@@ -79,10 +86,19 @@ public class JsonTestersAutoConfiguration {
 		@Bean
 		@Scope("prototype")
 		@ConditionalOnBean(ObjectMapper.class)
+		@ImportRuntimeHints(JacksonTesterRuntimeHints.class)
 		FactoryBean<JacksonTester<?>> jacksonTesterFactoryBean(ObjectMapper mapper) {
 			return new JsonTesterFactoryBean<>(JacksonTester.class, mapper);
 		}
 
+		static class JacksonTesterRuntimeHints extends AbstractJsonMarshalTesterRuntimeHints {
+
+			JacksonTesterRuntimeHints() {
+				super(JacksonTester.class);
+			}
+
+		}
+
 	}
 
 	@Configuration(proxyBeanMethods = false)
@@ -92,10 +108,19 @@ public class JsonTestersAutoConfiguration {
 		@Bean
 		@Scope("prototype")
 		@ConditionalOnBean(Gson.class)
+		@ImportRuntimeHints(GsonTesterRuntimeHints.class)
 		FactoryBean<GsonTester<?>> gsonTesterFactoryBean(Gson gson) {
 			return new JsonTesterFactoryBean<>(GsonTester.class, gson);
 		}
 
+		static class GsonTesterRuntimeHints extends AbstractJsonMarshalTesterRuntimeHints {
+
+			GsonTesterRuntimeHints() {
+				super(GsonTester.class);
+			}
+
+		}
+
 	}
 
 	@Configuration(proxyBeanMethods = false)
@@ -105,10 +130,19 @@ public class JsonTestersAutoConfiguration {
 		@Bean
 		@Scope("prototype")
 		@ConditionalOnBean(Jsonb.class)
+		@ImportRuntimeHints(JsonbJsonTesterRuntimeHints.class)
 		FactoryBean<JsonbTester<?>> jsonbTesterFactoryBean(Jsonb jsonb) {
 			return new JsonTesterFactoryBean<>(JsonbTester.class, jsonb);
 		}
 
+		static class JsonbJsonTesterRuntimeHints extends AbstractJsonMarshalTesterRuntimeHints {
+
+			JsonbJsonTesterRuntimeHints() {
+				super(JsonbTester.class);
+			}
+
+		}
+
 	}
 
 	/**
@@ -189,4 +223,36 @@ public class JsonTestersAutoConfiguration {
 
 	}
 
+	@SuppressWarnings("rawtypes")
+	static class AbstractJsonMarshalTesterRuntimeHints implements RuntimeHintsRegistrar {
+
+		private final Class<? extends AbstractJsonMarshalTester> tester;
+
+		AbstractJsonMarshalTesterRuntimeHints(Class<? extends AbstractJsonMarshalTester> tester) {
+			this.tester = tester;
+		}
+
+		@Override
+		public void registerHints(RuntimeHints hints, ClassLoader classLoader) {
+			ReflectionHints reflection = hints.reflection();
+			reflection.registerType(this.tester, MemberCategory.INVOKE_DECLARED_CONSTRUCTORS);
+			reflection.registerMethod(
+					ReflectionUtils.findMethod(this.tester, "initialize", Class.class, ResolvableType.class),
+					ExecutableMode.INVOKE);
+		}
+
+	}
+
+	static class BasicJsonTesterRuntimeHints implements RuntimeHintsRegistrar {
+
+		@Override
+		public void registerHints(RuntimeHints hints, ClassLoader classLoader) {
+			ReflectionHints reflection = hints.reflection();
+			reflection.registerType(BasicJsonTester.class, MemberCategory.INVOKE_DECLARED_CONSTRUCTORS);
+			reflection.registerMethod(ReflectionUtils.findMethod(BasicJsonTester.class, "initialize", Class.class),
+					ExecutableMode.INVOKE);
+		}
+
+	}
+
 }

spring-boot-project/spring-boot-test-autoconfigure/src/test/java/org/springframework/boot/test/autoconfigure/json/JsonTestersAutoConfigurationTests.java

@@ -0,0 +1,108 @@
+/*
+ * Copyright 2012-2022 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.test.autoconfigure.json;
+
+import java.util.function.Consumer;
+
+import org.junit.jupiter.api.Test;
+
+import org.springframework.aot.hint.RuntimeHints;
+import org.springframework.aot.hint.predicate.ReflectionHintsPredicates;
+import org.springframework.aot.hint.predicate.RuntimeHintsPredicates;
+import org.springframework.aot.test.generate.TestGenerationContext;
+import org.springframework.boot.autoconfigure.gson.GsonAutoConfiguration;
+import org.springframework.boot.autoconfigure.jackson.JacksonAutoConfiguration;
+import org.springframework.boot.autoconfigure.jsonb.JsonbAutoConfiguration;
+import org.springframework.boot.test.json.BasicJsonTester;
+import org.springframework.boot.test.json.GsonTester;
+import org.springframework.boot.test.json.JacksonTester;
+import org.springframework.boot.test.json.JsonbTester;
+import org.springframework.boot.test.util.TestPropertyValues;
+import org.springframework.context.annotation.AnnotationConfigApplicationContext;
+import org.springframework.context.aot.ApplicationContextAotGenerator;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Tests for {@link JsonTestersAutoConfiguration}.
+ *
+ * @author Andy Wilkinson
+ */
+class JsonTestersAutoConfigurationTests {
+
+	@Test
+	void withNoMarshallersOnlyBasicJsonTesterHintsAreContributed() {
+		jsonTesters((runtimeHints) -> {
+			ReflectionHintsPredicates reflection = RuntimeHintsPredicates.reflection();
+			assertThat(reflection.onType(BasicJsonTester.class)).accepts(runtimeHints);
+			assertThat(reflection.onType(JacksonTester.class).negate()).accepts(runtimeHints);
+			assertThat(reflection.onType(JsonbTester.class).negate()).accepts(runtimeHints);
+			assertThat(reflection.onType(GsonTester.class).negate()).accepts(runtimeHints);
+		});
+	}
+
+	@Test
+	void withObjectMapperBeanJacksonTesterHintsAreContributed() {
+		jsonTestersWith(JacksonAutoConfiguration.class, (runtimeHints) -> {
+			ReflectionHintsPredicates reflection = RuntimeHintsPredicates.reflection();
+			assertThat(reflection.onType(BasicJsonTester.class)).accepts(runtimeHints);
+			assertThat(reflection.onType(JacksonTester.class)).accepts(runtimeHints);
+			assertThat(reflection.onType(JsonbTester.class).negate()).accepts(runtimeHints);
+			assertThat(reflection.onType(GsonTester.class).negate()).accepts(runtimeHints);
+		});
+	}
+
+	@Test
+	void withGsonBeanGsonTesterHintsAreContributed() {
+		jsonTestersWith(GsonAutoConfiguration.class, (runtimeHints) -> {
+			ReflectionHintsPredicates reflection = RuntimeHintsPredicates.reflection();
+			assertThat(reflection.onType(BasicJsonTester.class)).accepts(runtimeHints);
+			assertThat(reflection.onType(JacksonTester.class).negate()).accepts(runtimeHints);
+			assertThat(reflection.onType(JsonbTester.class).negate()).accepts(runtimeHints);
+			assertThat(reflection.onType(GsonTester.class)).accepts(runtimeHints);
+		});
+	}
+
+	@Test
+	void withJsonbBeanJsonbTesterHintsAreContributed() {
+		jsonTestersWith(JsonbAutoConfiguration.class, (runtimeHints) -> {
+			ReflectionHintsPredicates reflection = RuntimeHintsPredicates.reflection();
+			assertThat(reflection.onType(BasicJsonTester.class)).accepts(runtimeHints);
+			assertThat(reflection.onType(JacksonTester.class).negate()).accepts(runtimeHints);
+			assertThat(reflection.onType(JsonbTester.class)).accepts(runtimeHints);
+			assertThat(reflection.onType(GsonTester.class).negate()).accepts(runtimeHints);
+		});
+	}
+
+	private void jsonTesters(Consumer<RuntimeHints> hintsConsumer) {
+		jsonTestersWith(null, hintsConsumer);
+	}
+
+	private void jsonTestersWith(Class<?> configuration, Consumer<RuntimeHints> hintsConsumer) {
+		try (AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext()) {
+			TestPropertyValues.of("spring.test.jsontesters.enabled=true").applyTo(context);
+			if (configuration != null) {
+				context.register(configuration);
+			}
+			context.register(JsonTestersAutoConfiguration.class);
+			TestGenerationContext generationContext = new TestGenerationContext();
+			new ApplicationContextAotGenerator().processAheadOfTime(context, generationContext);
+			hintsConsumer.accept(generationContext.getRuntimeHints());
+		}
+	}
+
+}