Polish test

See gh-10139

spring-boot-actuator/src/test/java/org/springframework/boot/actuate/endpoint/LiquibaseEndpointTests.java

@@ -21,12 +21,12 @@ import java.util.Map;
 import liquibase.integration.spring.SpringLiquibase;
 import org.junit.Test;
 
-import org.springframework.boot.autoconfigure.jdbc.EmbeddedDataSourceConfiguration;
+import org.springframework.boot.autoconfigure.AutoConfigurations;
+import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;
 import org.springframework.boot.autoconfigure.liquibase.LiquibaseAutoConfiguration;
 import org.springframework.boot.test.context.runner.ApplicationContextRunner;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
-import org.springframework.context.annotation.Import;
 
 import static org.assertj.core.api.Assertions.assertThat;
 
@@ -35,12 +35,19 @@ import static org.assertj.core.api.Assertions.assertThat;
  *
  * @author Eddú Meléndez
  * @author Andy Wilkinson
+ * @author Stephane Nicoll
  */
 public class LiquibaseEndpointTests {
 
+	private final ApplicationContextRunner contextRunner = new ApplicationContextRunner()
+			.withConfiguration(AutoConfigurations.of(DataSourceAutoConfiguration.class,
+					LiquibaseAutoConfiguration.class))
+			.withPropertyValues("spring.datasource.generate-unique-name=true");
+
+
 	@Test
 	public void liquibaseReportIsReturned() throws Exception {
-		new ApplicationContextRunner().withUserConfiguration(Config.class)
+		this.contextRunner.withUserConfiguration(Config.class)
 				.run((context) -> assertThat(
 						context.getBean(LiquibaseEndpoint.class).liquibaseReports())
 								.hasSize(1));
@@ -48,17 +55,15 @@ public class LiquibaseEndpointTests {
 
 	@Test
 	public void invokeWithCustomSchema() throws Exception {
-		ApplicationContextRunner contextRunner = new ApplicationContextRunner()
-				.withUserConfiguration(Config.class)
-				.withPropertyValues("liquibase.default-schema=CUSTOMSCHEMA",
-						"spring.datasource.generate-unique-name=true",
-						"spring.datasource.schema=classpath:/db/create-custom-schema.sql");
-		contextRunner.run((context) -> assertThat(
-				context.getBean(LiquibaseEndpoint.class).liquibaseReports()).hasSize(1));
+		this.contextRunner.withUserConfiguration(Config.class)
+				.withPropertyValues("spring.liquibase.default-schema=CUSTOMSCHEMA",
+						"spring.datasource.schema=classpath:/db/create-custom-schema.sql")
+				.run((context) -> assertThat(
+						context.getBean(LiquibaseEndpoint.class).liquibaseReports())
+								.hasSize(1));
 	}
 
 	@Configuration
-	@Import({ EmbeddedDataSourceConfiguration.class, LiquibaseAutoConfiguration.class })
 	public static class Config {
 
 		@Bean