Automatically find test configurations

Allow detection of `@SpringBootConfiguration` classes for both standard
spring tests and bootstrap (@IntegrationTest @WebIntegrationTest) based
tests.

Closes gh-5295

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

@@ -0,0 +1,102 @@
+/*
+ * 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;
+
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.Set;
+
+import org.springframework.beans.factory.config.BeanDefinition;
+import org.springframework.boot.SpringBootConfiguration;
+import org.springframework.context.annotation.ClassPathScanningCandidateComponentProvider;
+import org.springframework.core.type.filter.AnnotationTypeFilter;
+import org.springframework.util.Assert;
+import org.springframework.util.ClassUtils;
+
+/**
+ * Internal utility class to scan for a {@link SpringBootConfiguration} class.
+ *
+ * @author Phillip Webb
+ */
+final class SpringBootConfigurationFinder {
+
+	private static final Map<String, Class<?>> cache = Collections
+			.synchronizedMap(new Cache(40));
+
+	private final ClassPathScanningCandidateComponentProvider scanner;
+
+	SpringBootConfigurationFinder() {
+		this.scanner = new ClassPathScanningCandidateComponentProvider(false);
+		this.scanner.addIncludeFilter(
+				new AnnotationTypeFilter(SpringBootConfiguration.class));
+		this.scanner.setResourcePattern("*.class");
+	}
+
+	public Class<?> findFromClass(Class<?> source) {
+		Assert.notNull(source, "Source must not be null");
+		return findFromPackage(ClassUtils.getPackageName(source));
+	}
+
+	public Class<?> findFromPackage(String source) {
+		Assert.notNull(source, "Source must not be null");
+		Class<?> configuration = cache.get(source);
+		if (configuration == null) {
+			configuration = scanPackage(source);
+			cache.put(source, configuration);
+		}
+		return configuration;
+	}
+
+	private Class<?> scanPackage(String source) {
+		while (source.length() > 0) {
+			Set<BeanDefinition> components = this.scanner.findCandidateComponents(source);
+			if (!components.isEmpty()) {
+				Assert.state(components.size() == 1,
+						"Found multiple @SpringBootConfiguration annotated classes");
+				return ClassUtils.resolveClassName(
+						components.iterator().next().getBeanClassName(), null);
+			}
+			source = getParentPackage(source);
+		}
+		return null;
+	}
+
+	private String getParentPackage(String sourcePackage) {
+		int lastDot = sourcePackage.lastIndexOf(".");
+		return (lastDot == -1 ? "" : sourcePackage.substring(0, lastDot));
+	}
+
+	/**
+	 * Cache implementation based on {@link LinkedHashMap}.
+	 */
+	private static class Cache extends LinkedHashMap<String, Class<?>> {
+
+		private final int maxSize;
+
+		Cache(int maxSize) {
+			super(16, 0.75f, true);
+			this.maxSize = maxSize;
+		}
+
+		@Override
+		protected boolean removeEldestEntry(Map.Entry<String, Class<?>> eldest) {
+			return size() > this.maxSize;
+		}
+
+	}
+}

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

@@ -0,0 +1,138 @@
+/*
+ * 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;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+
+import org.springframework.boot.SpringBootConfiguration;
+import org.springframework.core.annotation.AnnotatedElementUtils;
+import org.springframework.test.context.ContextLoader;
+import org.springframework.test.context.MergedContextConfiguration;
+import org.springframework.test.context.TestContextBootstrapper;
+import org.springframework.test.context.support.DefaultTestContextBootstrapper;
+import org.springframework.util.Assert;
+
+/**
+ * {@link TestContextBootstrapper} that uses {@link SpringApplicationContextLoader} and
+ * can automatically find the {@link SpringBootConfiguration @SpringBootConfiguration}.
+ *
+ * @author Phillip Webb
+ * @since 1.4.0
+ * @see TestConfiguration
+ */
+public class SpringBootTestContextBootstrapper extends DefaultTestContextBootstrapper {
+
+	private static final Log logger = LogFactory
+			.getLog(SpringBootTestContextBootstrapper.class);
+
+	@Override
+	protected Class<? extends ContextLoader> getDefaultContextLoaderClass(
+			Class<?> testClass) {
+		return SpringApplicationContextLoader.class;
+	}
+
+	@Override
+	protected MergedContextConfiguration processMergedContextConfiguration(
+			MergedContextConfiguration mergedConfig) {
+		Class<?>[] classes = getOrFindConfigurationClasses(mergedConfig);
+		List<String> propertySourceProperties = getAndProcessPropertySourceProperties(
+				mergedConfig);
+		return new MergedContextConfiguration(mergedConfig.getTestClass(),
+				mergedConfig.getLocations(), classes,
+				mergedConfig.getContextInitializerClasses(),
+				mergedConfig.getActiveProfiles(),
+				mergedConfig.getPropertySourceLocations(),
+				propertySourceProperties
+						.toArray(new String[propertySourceProperties.size()]),
+				mergedConfig.getContextCustomizers(), mergedConfig.getContextLoader(),
+				getCacheAwareContextLoaderDelegate(), mergedConfig.getParent());
+	}
+
+	protected Class<?>[] getOrFindConfigurationClasses(
+			MergedContextConfiguration mergedConfig) {
+		Class<?>[] classes = mergedConfig.getClasses();
+		if (containsNonTestComponent(classes) || mergedConfig.hasLocations()
+				|| !mergedConfig.getContextInitializerClasses().isEmpty()) {
+			return classes;
+		}
+		Class<?> found = new SpringBootConfigurationFinder()
+				.findFromClass(mergedConfig.getTestClass());
+		Assert.state(found != null,
+				"Unable to find a @SpringBootConfiguration, you need to use "
+						+ "@ContextConfiguration or @SpringApplicationConfiguration "
+						+ "with your test");
+		logger.info("Found @SpringBootConfiguration " + found.getName() + " for test "
+				+ mergedConfig.getTestClass());
+		return merge(found, classes);
+	}
+
+	private boolean containsNonTestComponent(Class<?>[] classes) {
+		for (Class<?> candidate : classes) {
+			if (!AnnotatedElementUtils.isAnnotated(candidate, TestConfiguration.class)) {
+				return true;
+			}
+		}
+		return false;
+	}
+
+	private Class<?>[] merge(Class<?> head, Class<?>[] existing) {
+		Class<?>[] result = new Class<?>[existing.length + 1];
+		result[0] = head;
+		System.arraycopy(existing, 0, result, 1, existing.length);
+		return result;
+	}
+
+	private List<String> getAndProcessPropertySourceProperties(
+			MergedContextConfiguration mergedConfig) {
+		List<String> propertySourceProperties = new ArrayList<String>(
+				Arrays.asList(mergedConfig.getPropertySourceProperties()));
+		String differentiator = getDifferentiatorPropertySourceProperty();
+		if (differentiator != null) {
+			propertySourceProperties.add(differentiator);
+		}
+		processPropertySourceProperties(mergedConfig, propertySourceProperties);
+		return propertySourceProperties;
+	}
+
+	/**
+	 * Return a "differentiator" property to ensure that there is something to
+	 * differentiate regular tests and bootstrapped tests. Without this property a cached
+	 * context could be returned that wasn't created by this bootstrapper. By default uses
+	 * the bootstrapper class as a property.
+	 * @return the differentator or {@code null}
+	 */
+	protected String getDifferentiatorPropertySourceProperty() {
+		return getClass().getName() + "=true";
+	}
+
+	/**
+	 * Post process the property source properties, adding or removing elements as
+	 * required.
+	 * @param mergedConfig the merged context configuration
+	 * @param propertySourceProperties the property source properties to process
+	 */
+	protected void processPropertySourceProperties(
+			MergedContextConfiguration mergedConfig,
+			List<String> propertySourceProperties) {
+	}
+
+}

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

@@ -0,0 +1,51 @@
+/*
+ * 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;
+
+import java.lang.annotation.Documented;
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+import org.springframework.boot.SpringBootConfiguration;
+import org.springframework.context.annotation.Configuration;
+
+/**
+ * {@link Configuration @Configuration} that can be used to define additional beans or
+ * customizations for a test. Unlike regular {@code @Configuration} classes the use of
+ * {@code @TestConfiguration} does not prevent auto-detection of
+ * {@link SpringBootConfiguration @SpringBootConfiguration}.
+ *
+ * @author Phillip Webb
+ * @since 1.4.0
+ * @see SpringBootTestContextBootstrapper
+ */
+@Target(ElementType.TYPE)
+@Retention(RetentionPolicy.RUNTIME)
+@Documented
+@Configuration
+@TestComponent
+public @interface TestConfiguration {
+
+	/**
+	 * Explicitly specify the name of the Spring bean definition associated with this
+	 * Configuration class. See {@link Configuration#value()} for details.
+	 */
+	String value() default "";
+
+}

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

@@ -17,34 +17,23 @@
 package org.springframework.boot.test.context.web;
 
 import org.springframework.boot.test.context.MergedContextConfigurationProperties;
+import org.springframework.boot.test.context.SpringBootTestContextBootstrapper;
 import org.springframework.core.annotation.AnnotatedElementUtils;
-import org.springframework.test.context.ContextLoader;
 import org.springframework.test.context.MergedContextConfiguration;
 import org.springframework.test.context.TestContextBootstrapper;
-import org.springframework.test.context.support.DefaultTestContextBootstrapper;
-import org.springframework.test.context.web.WebDelegatingSmartContextLoader;
 import org.springframework.test.context.web.WebMergedContextConfiguration;
 
 /**
  * {@link TestContextBootstrapper} for Spring Boot web integration tests.
  *
  * @author Phillip Webb
- * @since 1.2.1
  */
-class WebAppIntegrationTestContextBootstrapper extends DefaultTestContextBootstrapper {
+class WebAppIntegrationTestContextBootstrapper extends SpringBootTestContextBootstrapper {
-
-	@Override
-	protected Class<? extends ContextLoader> getDefaultContextLoaderClass(
-			Class<?> testClass) {
-		if (AnnotatedElementUtils.isAnnotated(testClass, WebIntegrationTest.class)) {
-			return WebDelegatingSmartContextLoader.class;
-		}
-		return super.getDefaultContextLoaderClass(testClass);
-	}
 
 	@Override
 	protected MergedContextConfiguration processMergedContextConfiguration(
 			MergedContextConfiguration mergedConfig) {
+		mergedConfig = super.processMergedContextConfiguration(mergedConfig);
 		WebIntegrationTest annotation = AnnotatedElementUtils.findMergedAnnotation(
 				mergedConfig.getTestClass(), WebIntegrationTest.class);
 		if (annotation != null) {

spring-boot-test/src/test/java/org/springframework/boot/test/context/SpringBootConfigurationFinderTests.java

@@ -0,0 +1,73 @@
+/*
+ * 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;
+
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.ExpectedException;
+
+import org.springframework.boot.test.context.example.ExampleConfig;
+import org.springframework.boot.test.context.example.scan.Example;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Tests for {@link SpringBootConfigurationFinder}.
+ *
+ * @author Phillip Webb
+ */
+public class SpringBootConfigurationFinderTests {
+
+	@Rule
+	public ExpectedException thrown = ExpectedException.none();
+
+	private SpringBootConfigurationFinder finder = new SpringBootConfigurationFinder();
+
+	@Test
+	public void findFromClassWhenSourceIsNullShouldThrowException() throws Exception {
+		this.thrown.expect(IllegalArgumentException.class);
+		this.thrown.expectMessage("Source must not be null");
+		this.finder.findFromClass((Class<?>) null);
+	}
+
+	@Test
+	public void findFromPackageWhenSourceIsNullShouldThrowException() throws Exception {
+		this.thrown.expect(IllegalArgumentException.class);
+		this.thrown.expectMessage("Source must not be null");
+		this.finder.findFromPackage((String) null);
+	}
+
+	@Test
+	public void findFromPackageWhenNoConfigurationFoundShouldReturnNull() {
+		Class<?> config = this.finder.findFromPackage("org.springframework.boot");
+		assertThat(config).isNull();
+	}
+
+	@Test
+	public void findFromClassWhenConfigurationIsFoundShouldReturnConfiguration() {
+		Class<?> config = this.finder.findFromClass(Example.class);
+		assertThat(config).isEqualTo(ExampleConfig.class);
+	}
+
+	@Test
+	public void findFromPackageWhenConfigurationIsFoundShouldReturnConfiguration() {
+		Class<?> config = this.finder
+				.findFromPackage("org.springframework.boot.test.context.example.scan");
+		assertThat(config).isEqualTo(ExampleConfig.class);
+	}
+
+}

spring-boot-test/src/test/java/org/springframework/boot/test/context/bootstrap/SpringBootTestContextBootstrapperExampleConfig.java

@@ -0,0 +1,29 @@
+/*
+ * 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.bootstrap;
+
+import org.springframework.boot.SpringBootConfiguration;
+
+/**
+ * Example configuration used in {@link SpringBootTestContextBootstrapperTests}.
+ *
+ * @author Phillip Webb
+ */
+@SpringBootConfiguration
+public class SpringBootTestContextBootstrapperExampleConfig {
+
+}

spring-boot-test/src/test/java/org/springframework/boot/test/context/bootstrap/SpringBootTestContextBootstrapperTests.java

@@ -0,0 +1,82 @@
+/*
+ * 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.bootstrap;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTestContextBootstrapper;
+import org.springframework.boot.test.context.TestConfiguration;
+import org.springframework.context.ApplicationContext;
+import org.springframework.context.annotation.Bean;
+import org.springframework.stereotype.Component;
+import org.springframework.test.context.BootstrapWith;
+import org.springframework.test.context.junit4.SpringRunner;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Tests for {@link SpringBootTestContextBootstrapper} (in its own package so we can test
+ * detection).
+ *
+ * @author Phillip Webb
+ */
+@RunWith(SpringRunner.class)
+@BootstrapWith(SpringBootTestContextBootstrapper.class)
+public class SpringBootTestContextBootstrapperTests {
+
+	@Autowired
+	private ApplicationContext context;
+
+	@Autowired
+	private SpringBootTestContextBootstrapperExampleConfig config;
+
+	@Test
+	public void findConfigAutomatically() throws Exception {
+		assertThat(this.config).isNotNull();
+	}
+
+	@Test
+	public void contextWasCreatedViaSpringApplication() throws Exception {
+		assertThat(this.context.getId()).startsWith("application:");
+	}
+
+	@Test
+	public void testConfigurationWasApplied() throws Exception {
+		assertThat(this.context.getBean(ExampleBean.class)).isNotNull();
+	}
+
+	@TestConfiguration
+	static class TestConfig {
+
+		@Bean
+		public ExampleBean exampleBean() {
+			return new ExampleBean();
+		}
+
+	}
+
+	static class ExampleBean {
+
+	}
+
+	@Component
+	static class ExampleTestComponent {
+
+	}
+}

spring-boot-test/src/test/java/org/springframework/boot/test/context/bootstrap/SpringBootTestContextBootstrapperWithContextConfigurationTests.java

@@ -0,0 +1,58 @@
+/*
+ * 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.bootstrap;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTestContextBootstrapper;
+import org.springframework.context.ApplicationContext;
+import org.springframework.test.context.BootstrapWith;
+import org.springframework.test.context.ContextConfiguration;
+import org.springframework.test.context.junit4.SpringRunner;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Tests for {@link SpringBootTestContextBootstrapper} + {@code @ContextConfiguration} (in
+ * its own package so we can test detection).
+ *
+ * @author Phillip Webb
+ */
+@RunWith(SpringRunner.class)
+@BootstrapWith(SpringBootTestContextBootstrapper.class)
+@ContextConfiguration
+public class SpringBootTestContextBootstrapperWithContextConfigurationTests {
+
+	@Autowired
+	private ApplicationContext context;
+
+	@Autowired
+	private SpringBootTestContextBootstrapperExampleConfig config;
+
+	@Test
+	public void findConfigAutomatically() throws Exception {
+		assertThat(this.config).isNotNull();
+	}
+
+	@Test
+	public void contextWasCreatedViaSpringApplication() throws Exception {
+		assertThat(this.context.getId()).startsWith("application:");
+	}
+
+}

spring-boot-test/src/test/java/org/springframework/boot/test/context/example/ExampleConfig.java

@@ -0,0 +1,30 @@
+/*
+ * 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.example;
+
+import org.springframework.boot.SpringBootConfiguration;
+import org.springframework.boot.test.context.SpringBootConfigurationFinderTests;
+
+/**
+ * Example config used in {@link SpringBootConfigurationFinderTests}.
+ *
+ * @author Phillip Webb
+ */
+@SpringBootConfiguration
+public class ExampleConfig {
+
+}

spring-boot-test/src/test/java/org/springframework/boot/test/context/example/scan/Example.java

@@ -0,0 +1,28 @@
+/*
+ * 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.example.scan;
+
+import org.springframework.boot.test.context.SpringBootConfigurationFinderTests;
+
+/**
+ * Example class used in {@link SpringBootConfigurationFinderTests}.
+ *
+ * @author Phillip Webb
+ */
+public class Example {
+
+}

spring-boot-test/src/test/java/org/springframework/boot/test/context/example/scan/sub/SubExampleConfig.java

@@ -0,0 +1,31 @@
+/*
+ * 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.example.scan.sub;
+
+import org.springframework.boot.SpringBootConfiguration;
+import org.springframework.boot.test.context.SpringBootConfigurationFinderTests;
+
+/**
+ * Example config used in {@link SpringBootConfigurationFinderTests}. Should not be found
+ * since scanner should only search upwards.
+ *
+ * @author Phillip Webb
+ */
+@SpringBootConfiguration
+public class SubExampleConfig {
+
+}