Allow WebDriver beans to define their own scope

Update `WebDriverScope` so that only `WebDriver` beans with no explicit
scope are moved.

Fixes gh-7454

spring-boot-docs/src/main/asciidoc/spring-boot-features.adoc

@@ -5226,6 +5226,11 @@ and/or a `WebDriver` bean. Here is an example that uses HtmlUnit:
 	}
 ----
 
+NOTE: By default Spring Boot will put `WebDriver` beans in a special "`scope`" to ensure
+that the driver is quit after each test, and that a new instance is injected. If you don't
+want this behavor you can add `@Scope("singleton")` to your `WebDriver` `@Bean`
+definition.
+
 A list of the auto-configuration that is enabled by `@WebMvcTest` can be
 <<appendix-test-auto-configuration#test-auto-configuration,found in the appendix>>.
 

spring-boot-test-autoconfigure/src/main/java/org/springframework/boot/test/autoconfigure/web/servlet/WebDriverScope.java

@@ -23,12 +23,14 @@ import org.openqa.selenium.WebDriver;
 
 import org.springframework.beans.BeansException;
 import org.springframework.beans.factory.ObjectFactory;
+import org.springframework.beans.factory.config.BeanDefinition;
 import org.springframework.beans.factory.config.BeanFactoryPostProcessor;
 import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
 import org.springframework.beans.factory.config.Scope;
 import org.springframework.context.ApplicationContext;
 import org.springframework.context.ConfigurableApplicationContext;
 import org.springframework.util.ClassUtils;
+import org.springframework.util.StringUtils;
 
 /**
  * A special scope used for {@link WebDriver} beans. Usually registered by a
@@ -122,8 +124,11 @@ class WebDriverScope implements Scope {
 				for (String beanClass : BEAN_CLASSES) {
 					for (String beanName : beanFactory.getBeanNamesForType(
 							ClassUtils.resolveClassName(beanClass, null))) {
-						beanFactory.getBeanDefinition(beanName).setScope(NAME);
-
+						BeanDefinition definition = beanFactory
+								.getBeanDefinition(beanName);
+						if (!StringUtils.hasLength(definition.getScope())) {
+							definition.setScope(NAME);
+						}
 					}
 				}
 			}

spring-boot-test-autoconfigure/src/test/java/org/springframework/boot/test/autoconfigure/web/servlet/WebMvcTestWebDriverCustomScopeIntegrationTests.java

@@ -0,0 +1,100 @@
+/*
+ * 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.autoconfigure.web.servlet;
+
+import org.junit.FixMethodOrder;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.MethodSorters;
+import org.openqa.selenium.WebDriver;
+import org.openqa.selenium.htmlunit.HtmlUnitDriver;
+
+import org.springframework.beans.factory.FactoryBean;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.Scope;
+import org.springframework.test.context.junit4.SpringRunner;
+import org.springframework.test.web.servlet.MockMvc;
+import org.springframework.test.web.servlet.htmlunit.webdriver.MockMvcHtmlUnitDriverBuilder;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Tests for {@link WebMvcTest} with {@link WebDriver} in a custom scope.
+ *
+ * @author Phillip Webb
+ */
+@RunWith(SpringRunner.class)
+@WebMvcTest(secure = false)
+@FixMethodOrder(MethodSorters.NAME_ASCENDING)
+public class WebMvcTestWebDriverCustomScopeIntegrationTests {
+
+	// gh-7454
+
+	private static WebDriver previousWebDriver;
+
+	@Autowired
+	private WebDriver webDriver;
+
+	@Test
+	public void shouldAutoConfigureWebClient() throws Exception {
+		WebMvcTestWebDriverCustomScopeIntegrationTests.previousWebDriver = this.webDriver;
+	}
+
+	@Test
+	public void shouldBeADifferentWebClient() throws Exception {
+		assertThat(previousWebDriver).isNotNull().isSameAs(this.webDriver);
+	}
+
+	@Configuration
+	static class Config {
+
+		@Bean
+		@Scope("singleton")
+		public WebDriverFactory webDriver(MockMvc mockMvc) {
+			return new WebDriverFactory(mockMvc);
+		}
+
+	}
+
+	static class WebDriverFactory implements FactoryBean<WebDriver> {
+
+		private final HtmlUnitDriver driver;
+
+		WebDriverFactory(MockMvc mockMvc) {
+			this.driver = MockMvcHtmlUnitDriverBuilder.mockMvcSetup(mockMvc).build();
+		}
+
+		@Override
+		public boolean isSingleton() {
+			return true;
+		}
+
+		@Override
+		public Class<?> getObjectType() {
+			return WebDriver.class;
+		}
+
+		@Override
+		public WebDriver getObject() throws Exception {
+			return this.driver;
+		}
+
+	}
+
+}