Fix clashing bean name with JsonTest and Jacksons 2 and 3

Fixes gh-48198

module/spring-boot-jackson2/src/main/java/org/springframework/boot/jackson2/autoconfigure/Jackson2TesterTestAutoConfiguration.java

@@ -48,7 +48,7 @@ final class Jackson2TesterTestAutoConfiguration {
 	@Scope(ConfigurableBeanFactory.SCOPE_PROTOTYPE)
 	@ConditionalOnBean(ObjectMapper.class)
 	@ImportRuntimeHints(Jackson2TesterRuntimeHints.class)
-	FactoryBean<Jackson2Tester<?>> jacksonTesterFactoryBean(ObjectMapper mapper) {
+	FactoryBean<Jackson2Tester<?>> jackson2TesterFactoryBean(ObjectMapper mapper) {
 		return new JsonTesterFactoryBean<>(Jackson2Tester.class, mapper);
 	}
 

smoke-test/spring-boot-smoke-test-jackson2-mixed/src/test/java/smoketest/jackson2/mixed/SampleJackson2MixedApplicationJsonTests.java

@@ -0,0 +1,56 @@
+/*
+ * Copyright 2012-present 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 smoketest.jackson2.mixed;
+
+import org.junit.jupiter.api.Test;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.autoconfigure.json.JsonTest;
+import org.springframework.boot.test.json.JacksonTester;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * {@link JsonTest JSON Tests} for {@link SampleJackson2MixedApplication}.
+ *
+ * @author Andy Wilkinson
+ */
+@JsonTest
+class SampleJackson2MixedApplicationJsonTests {
+
+	@Autowired
+	@SuppressWarnings({ "deprecation", "removal" })
+	org.springframework.boot.test.json.Jackson2Tester<Pojo> jackson2Tester;
+
+	@Autowired
+	JacksonTester<Pojo> jacksonTester;
+
+	@Test
+	void jackson2TesterIsInitialized() {
+		assertThat(this.jackson2Tester).isNotNull();
+	}
+
+	@Test
+	void jacksonTesterIsInitialized() {
+		assertThat(this.jacksonTester).isNotNull();
+	}
+
+	static class Pojo {
+
+	}
+
+}