Polish DisabledIfDockerUnavailable

Convert `DisabledIfDockerUnavailable` to be an annotation and make
it slightly less noisy.

spring-boot-project/spring-boot-tools/spring-boot-test-support/src/main/java/org/springframework/boot/testsupport/testcontainers/DisabledIfDockerUnavailable.java

@@ -16,38 +16,25 @@
 
 package org.springframework.boot.testsupport.testcontainers;
 
-import org.junit.jupiter.api.extension.ConditionEvaluationResult;
-import org.junit.jupiter.api.extension.ExecutionCondition;
-import org.junit.jupiter.api.extension.ExtensionContext;
-import org.testcontainers.DockerClientFactory;
+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.junit.jupiter.api.extension.ExtendWith;
 
 /**
- * An {@link ExecutionCondition} that disables execution if Docker is unavailable.
+ * Disables test execution if Docker is unavailable.
  *
  * @author Andy Wilkinson
+ * @author Phillip Webb
  * @since 2.3.0
  */
-public class DisabledIfDockerUnavailable implements ExecutionCondition {
-
-	@Override
-	public ConditionEvaluationResult evaluateExecutionCondition(ExtensionContext context) {
-		System.out.println("Checking Docker's availability");
-		if (isDockerAvailable()) {
-			System.out.println("Docker available");
-			return ConditionEvaluationResult.enabled("Docker is available");
-		}
-		System.out.println("Docker unavailable");
-		return ConditionEvaluationResult.disabled("Docker is not available");
-	}
-
-	private boolean isDockerAvailable() {
-		try {
-			DockerClientFactory.instance().client();
-			return true;
-		}
-		catch (Throwable ex) {
-			return false;
-		}
-	}
+@Target({ ElementType.TYPE, ElementType.METHOD })
+@Retention(RetentionPolicy.RUNTIME)
+@Documented
+@ExtendWith(DisabledIfDockerUnavailableCondition.class)
+public @interface DisabledIfDockerUnavailable {
 
 }

spring-boot-project/spring-boot-tools/spring-boot-test-support/src/main/java/org/springframework/boot/testsupport/testcontainers/DisabledIfDockerUnavailableCondition.java

@@ -0,0 +1,58 @@
+/*
+ * Copyright 2012-2020 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
+ *
+ *      https://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.testsupport.testcontainers;
+
+import org.junit.jupiter.api.extension.ConditionEvaluationResult;
+import org.junit.jupiter.api.extension.ExecutionCondition;
+import org.junit.jupiter.api.extension.ExtensionContext;
+import org.testcontainers.DockerClientFactory;
+
+/**
+ * An {@link ExecutionCondition} that disables execution if Docker is unavailable.
+ *
+ * @author Andy Wilkinson
+ * @author Phillip Webb
+ */
+class DisabledIfDockerUnavailableCondition implements ExecutionCondition {
+
+	private static final String SILENCE_PROPERTY = "visibleassertions.silence";
+
+	private static final ConditionEvaluationResult ENABLED = ConditionEvaluationResult.enabled("Docker available");
+
+	private static final ConditionEvaluationResult DISABLED = ConditionEvaluationResult.disabled("Docker unavailable");
+
+	@Override
+	public ConditionEvaluationResult evaluateExecutionCondition(ExtensionContext context) {
+		String originalSilenceValue = System.getProperty(SILENCE_PROPERTY);
+		try {
+			DockerClientFactory.instance().client();
+			return ENABLED;
+		}
+		catch (Throwable ex) {
+			return DISABLED;
+		}
+		finally {
+			if (originalSilenceValue != null) {
+				System.setProperty(SILENCE_PROPERTY, originalSilenceValue);
+			}
+			else {
+				System.clearProperty(SILENCE_PROPERTY);
+			}
+		}
+	}
+
+}

spring-boot-tests/spring-boot-deployment-tests/src/intTest/java/sample/DeploymentIntegrationTests.java

@@ -26,7 +26,6 @@ import org.apache.http.impl.client.HttpClients;
 import org.apache.http.impl.client.StandardHttpRequestRetryHandler;
 import org.awaitility.Awaitility;
 import org.awaitility.core.ConditionTimeoutException;
-import org.junit.jupiter.api.extension.ExtendWith;
 import org.junit.jupiter.params.ParameterizedTest;
 import org.junit.jupiter.params.provider.MethodSource;
 import org.testcontainers.containers.GenericContainer;
@@ -44,7 +43,7 @@ import static org.assertj.core.api.Assertions.assertThat;
 /**
  * Deployment integration tests.
  */
-@ExtendWith(DisabledIfDockerUnavailable.class)
+@DisabledIfDockerUnavailable
 class DeploymentIntegrationTests {
 
 	@ParameterizedTest
@@ -116,6 +115,7 @@ class DeploymentIntegrationTests {
 			}
 		}
 
+		@Override
 		public String toString() {
 			return this.baseImage;
 		}

spring-boot-tests/spring-boot-integration-tests/spring-boot-launch-script-tests/src/intTest/java/org/springframework/boot/launchscript/SysVinitLaunchScriptIntegrationTests.java

@@ -24,7 +24,6 @@ import java.util.regex.Pattern;
 
 import org.assertj.core.api.Condition;
 import org.junit.jupiter.api.Assumptions;
-import org.junit.jupiter.api.extension.ExtendWith;
 import org.junit.jupiter.params.ParameterizedTest;
 import org.junit.jupiter.params.provider.MethodSource;
 import org.testcontainers.containers.GenericContainer;
@@ -44,7 +43,7 @@ import static org.hamcrest.Matchers.containsString;
  * @author Andy Wilkinson
  * @author Ali Shahbour
  */
-@ExtendWith(DisabledIfDockerUnavailable.class)
+@DisabledIfDockerUnavailable
 class SysVinitLaunchScriptIntegrationTests {
 
 	private static final char ESC = 27;