Ensure that Jackson and GSON are auto-configured by @AutoConfigureJsonTesters

Previously, @AutoConfigureJsonTesters only imported
JsonTestersAutoConfiguration and relied on something else pulling in
the Jackson and GSON auto-configuration upon which it depends. This
worked with @JsonTest which imported those auto-configurations. It
did not work with @SpringBootTest which would use
@EnableAutoConfiguration and the ordering was then wrong and
JsonTestersAutoConfiguration would be processed before the Jackson
and GSON auto-configurations had a chance to create the beans that
JsonTestersAutoConfiguration needs.

This commit updates the spring.factories configuration for
JsonTestersAutoConfiguration so that it imports
JacksonAutoConfiguration and GsonAutoConfiguration.
Appropriate @AutoConfigureAfter has also been added to
JsonTestersAutoConfiguration to ensure that it is considered after
JacksonAutoConfiguration and GsonAutoConfiguration.

Lastly, ExampleJsonApplication and associated classes have been moved
into an app sub-package to prevent its component scanning from
pulling in JsonTestersAutoConfiguration as if it were user
configuration.

Closes gh-9515

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

 /*
- * Copyright 2012-2016 the original author or authors.
+ * Copyright 2012-2017 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.
@@ -27,9 +27,12 @@ import org.springframework.beans.BeansException;
 import org.springframework.beans.factory.FactoryBean;
 import org.springframework.beans.factory.config.BeanPostProcessor;
 import org.springframework.beans.factory.config.InstantiationAwareBeanPostProcessorAdapter;
+import org.springframework.boot.autoconfigure.AutoConfigureAfter;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
+import org.springframework.boot.autoconfigure.gson.GsonAutoConfiguration;
+import org.springframework.boot.autoconfigure.jackson.JacksonAutoConfiguration;
 import org.springframework.boot.test.json.AbstractJsonMarshalTester;
 import org.springframework.boot.test.json.BasicJsonTester;
 import org.springframework.boot.test.json.GsonTester;
@@ -52,6 +55,7 @@ import org.springframework.util.ReflectionUtils.FieldCallback;
 @Configuration
 @ConditionalOnClass(name = "org.assertj.core.api.Assert")
 @ConditionalOnProperty("spring.test.jsontesters.enabled")
+@AutoConfigureAfter({ JacksonAutoConfiguration.class, GsonAutoConfiguration.class })
 public class JsonTestersAutoConfiguration {
 
 	@Bean

spring-boot-test-autoconfigure/src/main/resources/META-INF/spring.factories

@@ -41,7 +41,9 @@ org.springframework.boot.autoconfigure.jackson.JacksonAutoConfiguration
 
 # AutoConfigureJsonTesters auto-configuration imports
 org.springframework.boot.test.autoconfigure.json.AutoConfigureJsonTesters=\
-org.springframework.boot.test.autoconfigure.json.JsonTestersAutoConfiguration
+org.springframework.boot.test.autoconfigure.json.JsonTestersAutoConfiguration,\
+org.springframework.boot.autoconfigure.gson.GsonAutoConfiguration,\
+org.springframework.boot.autoconfigure.jackson.JacksonAutoConfiguration
 
 # AutoConfigureMockMvc auto-configuration imports
 org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc=\

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

@@ -20,10 +20,15 @@ import org.junit.Test;
 import org.junit.runner.RunWith;
 
 import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.autoconfigure.json.app.ExampleBasicObject;
+import org.springframework.boot.test.autoconfigure.json.app.ExampleCustomObject;
+import org.springframework.boot.test.autoconfigure.json.app.ExampleJsonApplication;
+import org.springframework.boot.test.autoconfigure.json.app.ExampleJsonObjectWithView;
 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.JsonContent;
+import org.springframework.test.context.ContextConfiguration;
 import org.springframework.test.context.junit4.SpringRunner;
 
 import static org.assertj.core.api.Assertions.assertThat;
@@ -36,6 +41,7 @@ import static org.assertj.core.api.Assertions.assertThat;
  */
 @RunWith(SpringRunner.class)
 @JsonTest
+@ContextConfiguration(classes = ExampleJsonApplication.class)
 public class JsonTestIntegrationTests {
 
 	@Autowired

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

 /*
- * Copyright 2012-2016 the original author or authors.
+ * Copyright 2012-2017 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.
@@ -20,6 +20,7 @@ import org.junit.Test;
 import org.junit.runner.RunWith;
 
 import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.autoconfigure.json.app.ExampleBasicObject;
 import org.springframework.boot.test.json.BasicJsonTester;
 import org.springframework.boot.test.json.GsonTester;
 import org.springframework.boot.test.json.JacksonTester;

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

+/*
+ * Copyright 2012-2017 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
+ *
+ *      http://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 org.junit.Test;
+import org.junit.runner.RunWith;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.autoconfigure.json.app.ExampleBasicObject;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.boot.test.json.BasicJsonTester;
+import org.springframework.boot.test.json.GsonTester;
+import org.springframework.boot.test.json.JacksonTester;
+import org.springframework.test.context.junit4.SpringRunner;
+
+/**
+ * Integration tests for {@link SpringBootTest} with {@link AutoConfigureJsonTesters}.
+ *
+ * @author Andy Wilkinson
+ */
+@RunWith(SpringRunner.class)
+@SpringBootTest
+@AutoConfigureJsonTesters
+public class SpringBootTestWithAutoConfigureJsonTestersTests {
+
+	@Autowired
+	BasicJsonTester basicJson;
+
+	@Autowired
+	JacksonTester<ExampleBasicObject> jacksonTester;
+
+	@Autowired
+	GsonTester<ExampleBasicObject> gsonTester;
+
+	@Test
+	public void contextLoads() {
+
+	}
+
+}

spring-boot-test-autoconfigure/src/test/java/org/springframework/boot/test/autoconfigure/json/ExampleBasicObject.java → spring-boot-test-autoconfigure/src/test/java/org/springframework/boot/test/autoconfigure/json/app/ExampleBasicObject.java

 /*
- * Copyright 2012-2016 the original author or authors.
+ * Copyright 2012-2017 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.
@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package org.springframework.boot.test.autoconfigure.json;
+package org.springframework.boot.test.autoconfigure.json.app;
 
 /**
  * Example object to read/write as JSON.

spring-boot-test-autoconfigure/src/test/java/org/springframework/boot/test/autoconfigure/json/ExampleCustomObject.java → spring-boot-test-autoconfigure/src/test/java/org/springframework/boot/test/autoconfigure/json/app/ExampleCustomObject.java

 /*
- * Copyright 2012-2016 the original author or authors.
+ * Copyright 2012-2017 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.
@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package org.springframework.boot.test.autoconfigure.json;
+package org.springframework.boot.test.autoconfigure.json.app;
 
 /**
  * Example object to read/write as JSON via {@link ExampleJsonComponent}.

spring-boot-test-autoconfigure/src/test/java/org/springframework/boot/test/autoconfigure/json/ExampleJsonApplication.java → spring-boot-test-autoconfigure/src/test/java/org/springframework/boot/test/autoconfigure/json/app/ExampleJsonApplication.java

 /*
- * Copyright 2012-2016 the original author or authors.
+ * Copyright 2012-2017 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.
@@ -14,9 +14,10 @@
  * limitations under the License.
  */
 
-package org.springframework.boot.test.autoconfigure.json;
+package org.springframework.boot.test.autoconfigure.json.app;
 
 import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.boot.test.autoconfigure.json.JsonTest;
 
 /**
  * Example {@link SpringBootApplication @SpringBootApplication} for use with

spring-boot-test-autoconfigure/src/test/java/org/springframework/boot/test/autoconfigure/json/ExampleJsonComponent.java → spring-boot-test-autoconfigure/src/test/java/org/springframework/boot/test/autoconfigure/json/app/ExampleJsonComponent.java

 /*
- * Copyright 2012-2016 the original author or authors.
+ * Copyright 2012-2017 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.
@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package org.springframework.boot.test.autoconfigure.json;
+package org.springframework.boot.test.autoconfigure.json.app;
 
 import java.io.IOException;
 
@@ -28,6 +28,7 @@ import com.fasterxml.jackson.databind.SerializerProvider;
 import org.springframework.boot.jackson.JsonComponent;
 import org.springframework.boot.jackson.JsonObjectDeserializer;
 import org.springframework.boot.jackson.JsonObjectSerializer;
+import org.springframework.boot.test.autoconfigure.json.JsonTest;
 
 /**
  * Example {@link JsonComponent} for use with {@link JsonTest @JsonTest} tests.

spring-boot-test-autoconfigure/src/test/java/org/springframework/boot/test/autoconfigure/json/ExampleJsonObjectWithView.java → spring-boot-test-autoconfigure/src/test/java/org/springframework/boot/test/autoconfigure/json/app/ExampleJsonObjectWithView.java

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package org.springframework.boot.test.autoconfigure.json;
+package org.springframework.boot.test.autoconfigure.json.app;
 
 import com.fasterxml.jackson.annotation.JsonView;
 
@@ -68,7 +68,7 @@ public class ExampleJsonObjectWithView {
 		return this.value + " " + this.id;
 	}
 
-	static class TestView {
+	public static class TestView {
 
 	}