Use TestContainers for integration tests

samples/boot/redis-json/src/integration-test/java/sample/HttpRedisJsonTest.java

@@ -20,9 +20,11 @@ import java.util.List;
 
 import org.junit.After;
 import org.junit.Before;
+import org.junit.ClassRule;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.openqa.selenium.WebDriver;
+import org.testcontainers.containers.GenericContainer;
 import sample.pages.HomePage;
 import sample.pages.HomePage.Attribute;
 import sample.pages.LoginPage;
@@ -31,6 +33,10 @@ import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc;
 import org.springframework.boot.test.context.SpringBootTest;
 import org.springframework.boot.test.context.SpringBootTest.WebEnvironment;
+import org.springframework.boot.test.util.TestPropertyValues;
+import org.springframework.context.ApplicationContextInitializer;
+import org.springframework.context.ConfigurableApplicationContext;
+import org.springframework.test.context.ContextConfiguration;
 import org.springframework.test.context.junit4.SpringRunner;
 import org.springframework.test.web.servlet.MockMvc;
 import org.springframework.test.web.servlet.htmlunit.webdriver.MockMvcHtmlUnitDriverBuilder;
@@ -39,12 +45,20 @@ import static org.assertj.core.api.Assertions.assertThat;
 
 /**
  * @author Eddú Meléndez
+ * @author Vedran Pavic
  */
 @RunWith(SpringRunner.class)
-@SpringBootTest(webEnvironment = WebEnvironment.MOCK)
+@SpringBootTest(classes = Application.class, webEnvironment = WebEnvironment.MOCK)
 @AutoConfigureMockMvc
+@ContextConfiguration(initializers = HttpRedisJsonTest.Initializer.class)
 public class HttpRedisJsonTest {
 
+	private static final String DOCKER_IMAGE = "redis:3.2.9";
+
+	@ClassRule
+	public static GenericContainer redisContainer = new GenericContainer(DOCKER_IMAGE)
+			.withExposedPorts(6379);
+
 	@Autowired
 	private MockMvc mockMvc;
 
@@ -96,4 +110,18 @@ public class HttpRedisJsonTest {
 		assertThat(attributes).extracting("attributeValue").contains("Demo Value");
 	}
 
+	static class Initializer
+			implements ApplicationContextInitializer<ConfigurableApplicationContext> {
+
+		@Override
+		public void initialize(
+				ConfigurableApplicationContext configurableApplicationContext) {
+			TestPropertyValues
+					.of("spring.redis.host=" + redisContainer.getContainerIpAddress(),
+							"spring.redis.port=" + redisContainer.getFirstMappedPort())
+					.applyTo(configurableApplicationContext.getEnvironment());
+		}
+
+	}
+
 }