Provide TestRestTemplate for @WebIntegrationTests

Add a ContextCustomizerFactory to provide TestRestTemplate as a bean for
tests annotated with WebIntegrationTests. Additionally provide support
for automatically expanding URLs of the form `/example` to
`http://localhost:${local.server.port}/example`.

Fixes gh-5227

spring-boot-test/src/main/java/org/springframework/boot/test/context/web/WebIntegrationTest.java

@@ -23,10 +23,13 @@ import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
 import java.lang.annotation.Target;
 
+import org.springframework.beans.factory.annotation.Autowire;
 import org.springframework.boot.test.context.IntegrationTest;
 import org.springframework.boot.test.context.SpringApplicationConfiguration;
 import org.springframework.boot.test.context.SpringApplicationContextLoader;
 import org.springframework.boot.test.context.SpringApplicationTest;
+import org.springframework.boot.test.web.client.LocalHostUriTemplateHandler;
+import org.springframework.boot.test.web.client.TestRestTemplate;
 import org.springframework.context.ApplicationContext;
 import org.springframework.core.env.Environment;
 import org.springframework.test.context.BootstrapWith;
@@ -49,6 +52,10 @@ import org.springframework.test.web.servlet.MockMvc;
  * application and want to mock the servlet environment (for example so that you can use
  * {@link MockMvc}) you should switch to the
  * {@link SpringApplicationTest @SpringApplicationTest} annotation.
+ * <p>
+ * Tests that need to make REST calls to the started server can additionally
+ * {@link Autowire @Autowire} a {@link TestRestTemplate} which will be pre-configured with
+ * a {@link LocalHostUriTemplateHandler}.
  *
  * @author Phillip Webb
  * @since 1.4.0

spring-boot-test/src/main/java/org/springframework/boot/test/context/web/WebIntegrationTestContextCustomizer.java

@@ -0,0 +1,61 @@
+/*
+ * Copyright 2012-2016 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.context.web;
+
+import org.springframework.boot.test.web.client.LocalHostUriTemplateHandler;
+import org.springframework.boot.test.web.client.TestRestTemplate;
+import org.springframework.context.ConfigurableApplicationContext;
+import org.springframework.core.env.Environment;
+import org.springframework.test.context.ContextCustomizer;
+import org.springframework.test.context.MergedContextConfiguration;
+
+/**
+ * {@link ContextCustomizer} for {@link WebIntegrationTest} that provides a
+ * {@link TestRestTemplate} bean that can automatically resolve
+ * {@literal local.server.port}.
+ *
+ * @author Phillip Webb
+ */
+class WebIntegrationTestContextCustomizer implements ContextCustomizer {
+
+	@Override
+	public void customizeContext(ConfigurableApplicationContext context,
+			MergedContextConfiguration mergedContextConfiguration) {
+		TestRestTemplate restTemplate = getRestTemplate(context.getEnvironment());
+		context.getBeanFactory().registerSingleton("testRestTemplate", restTemplate);
+	}
+
+	private TestRestTemplate getRestTemplate(Environment environment) {
+		TestRestTemplate template = new TestRestTemplate();
+		template.setUriTemplateHandler(new LocalHostUriTemplateHandler(environment));
+		return template;
+	}
+
+	@Override
+	public int hashCode() {
+		return getClass().hashCode();
+	}
+
+	@Override
+	public boolean equals(Object obj) {
+		if (obj == null || obj.getClass() != getClass()) {
+			return false;
+		}
+		return true;
+	}
+
+}

spring-boot-test/src/main/java/org/springframework/boot/test/context/web/WebIntegrationTestContextCustomizerFactory.java

@@ -0,0 +1,44 @@
+/*
+ * Copyright 2012-2016 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.context.web;
+
+import java.util.List;
+
+import org.springframework.core.annotation.AnnotatedElementUtils;
+import org.springframework.test.context.ContextConfigurationAttributes;
+import org.springframework.test.context.ContextCustomizer;
+import org.springframework.test.context.ContextCustomizerFactory;
+
+/**
+ * {@link ContextCustomizerFactory} for {@link WebIntegrationTest}.
+ *
+ * @author Phillip Webb
+ * @see WebIntegrationTestContextCustomizer
+ */
+class WebIntegrationTestContextCustomizerFactory implements ContextCustomizerFactory {
+
+	@Override
+	public ContextCustomizer createContextCustomizer(Class<?> testClass,
+			List<ContextConfigurationAttributes> configAttributes) {
+		if (AnnotatedElementUtils.findMergedAnnotation(testClass,
+				WebIntegrationTest.class) != null) {
+			return new WebIntegrationTestContextCustomizer();
+		}
+		return null;
+	}
+
+}

spring-boot-test/src/main/java/org/springframework/boot/test/web/client/LocalHostUriTemplateHandler.java

@@ -0,0 +1,46 @@
+/*
+ * Copyright 2012-2016 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.web.client;
+
+import org.springframework.core.env.Environment;
+import org.springframework.util.Assert;
+import org.springframework.web.util.DefaultUriTemplateHandler;
+import org.springframework.web.util.UriTemplateHandler;
+
+/**
+ * {@link UriTemplateHandler} will automatically prefix relative URLs with
+ * <code>localhost:$&#123;local.server.port&#125;</code>.
+ *
+ * @author Phillip Webb
+ * @since 1.4.0
+ */
+public class LocalHostUriTemplateHandler extends DefaultUriTemplateHandler {
+
+	private final Environment environment;
+
+	public LocalHostUriTemplateHandler(Environment environment) {
+		Assert.notNull(environment, "Environment must not be null");
+		this.environment = environment;
+	}
+
+	@Override
+	public String getBaseUrl() {
+		String port = this.environment.getProperty("local.server.port", "8080");
+		return "http://localhost:" + port;
+	}
+
+}

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

@@ -1,6 +1,7 @@
 # Spring Test ContextCustomizerFactories
 org.springframework.test.context.ContextCustomizerFactory=\
 org.springframework.boot.test.context.filter.ExcludeFilterContextCustomizerFactory,\
+org.springframework.boot.test.context.web.WebIntegrationTestContextCustomizerFactory,\
 org.springframework.boot.test.mock.mockito.MockitoContextCustomizerFactory
 
 # Test Execution Listeners

spring-boot-test/src/test/java/org/springframework/boot/test/web/client/LocalHostUriTemplateHandlerTests.java

@@ -0,0 +1,61 @@
+/*
+ * Copyright 2012-2016 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.web.client;
+
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.ExpectedException;
+
+import org.springframework.mock.env.MockEnvironment;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Tests for {@link LocalHostUriTemplateHandler}.
+ *
+ * @author Phillip Webb
+ */
+public class LocalHostUriTemplateHandlerTests {
+
+	@Rule
+	public ExpectedException thrown = ExpectedException.none();
+
+	@Test
+	public void createWhenEnvironmentIsNullShouldThrowException() {
+		this.thrown.expect(IllegalArgumentException.class);
+		this.thrown.expectMessage("Environment must not be null");
+		new LocalHostUriTemplateHandler(null);
+	}
+
+	@Test
+	public void getBaseUrlShouldUseLocalServerPort() throws Exception {
+		MockEnvironment environment = new MockEnvironment();
+		environment.setProperty("local.server.port", "1234");
+		LocalHostUriTemplateHandler handler = new LocalHostUriTemplateHandler(
+				environment);
+		assertThat(handler.getBaseUrl()).isEqualTo("http://localhost:1234");
+	}
+
+	@Test
+	public void getBaseUrlWhenLocalServerPortMissingShouldUsePort8080() throws Exception {
+		MockEnvironment environment = new MockEnvironment();
+		LocalHostUriTemplateHandler handler = new LocalHostUriTemplateHandler(
+				environment);
+		assertThat(handler.getBaseUrl()).isEqualTo("http://localhost:8080");
+	}
+
+}