Add Smoke Tests for the 'spring-geode-starter-logging' module.

Resolves gh-73.

spring-geode-tests/smoke-tests/logging/spring-geode-smoke-tests-logging.gradle

@@ -0,0 +1,15 @@
+apply plugin: 'io.spring.convention.spring-test'
+
+description = "Smoke Tests to assert that Spring for Apache Geode logging functions as expected."
+
+dependencies {
+
+	implementation "org.assertj:assertj-core"
+
+	// NOTE: 'spring-geode-starter-logging' must be the first entry on the application/test classpath
+	implementation project(":spring-geode-starter-logging")
+	implementation project(':spring-geode-starter')
+
+	testImplementation project(":spring-geode-starter-test")
+
+}

spring-geode-tests/smoke-tests/logging/src/main/java/example/app/geode/logging/ApacheGeodeLoggingApplication.java

@@ -0,0 +1,127 @@
+/*
+ * Copyright 2019 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 example.app.geode.logging;
+
+import org.springframework.boot.ApplicationRunner;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.annotation.Bean;
+import org.springframework.geode.logging.slf4j.logback.DelegatingAppender;
+import org.springframework.geode.logging.slf4j.logback.StringAppender;
+import org.springframework.geode.logging.slf4j.logback.support.LogbackSupport;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import ch.qos.logback.classic.LoggerContext;
+
+/**
+ * {@link SpringBootApplication Spring Boot application} used to assert and observe the log output from
+ * Apache Geode Logging.
+ *
+ * Use the following JVM {@link System} {@link java.util.Properties Property} to adjust {@link Logger} log level
+ * and log output:
+ *
+ * <code>
+ *     -Dlogback.root.log.level=INFO
+ *     -Dspring.boot.data.gemfire.log.level=INFO
+ * </code>
+ *
+ * Use the following JVM {@link System} {@link java.util.Properties Property} to configure a custom Logback
+ * log configuration file:
+ *
+ * <code>
+ *      -Dlogback.configurationFile=logback.xml
+ * </code>
+ *
+ * @author John Blum
+ * @see org.slf4j.Logger
+ * @see org.slf4j.LoggerFactory
+ * @see org.springframework.boot.ApplicationRunner
+ * @see org.springframework.boot.SpringApplication
+ * @see org.springframework.boot.autoconfigure.SpringBootApplication
+ * @see org.springframework.context.annotation.Bean
+ * @see org.springframework.geode.logging.slf4j.logback.DelegatingAppender
+ * @see org.springframework.geode.logging.slf4j.logback.StringAppender
+ * @see org.springframework.geode.logging.slf4j.logback.support.LogbackSupport
+ * @see ch.qos.logback.classic.LoggerContext
+ * @since 1.3.0
+ */
+@SpringBootApplication
+@SuppressWarnings({ "rawtypes", "unused" })
+public class ApacheGeodeLoggingApplication {
+
+	private static final StringAppender stringAppender;
+
+	static {
+		stringAppender = configureAndInitializeLoggingSystem();
+	}
+
+	@SuppressWarnings("unchecked")
+	private static StringAppender configureAndInitializeLoggingSystem() {
+
+		LoggerContext loggerContext = LogbackSupport.requireLoggerContext();
+
+		LogbackSupport.suppressSpringBootLogbackInitialization();
+
+		ch.qos.logback.classic.Logger rootLogger = LogbackSupport.requireLogbackRootLogger();
+
+		LogbackSupport.removeConsoleAppender(rootLogger);
+
+		DelegatingAppender delegatingAppender =
+			LogbackSupport.requireAppender(rootLogger, "delegate", DelegatingAppender.class);
+
+		return new StringAppender.Builder()
+			.applyTo(delegatingAppender)
+			.setContext(loggerContext)
+			.buildAndStart();
+	}
+
+	// Customizes the configuration of SLF4J using the Logback logging provider provided in
+	// the 'spring-geode-starter-logging' module.
+	public static void main(String[] args) {
+		SpringApplication.run(ApacheGeodeLoggingApplication.class, args);
+	}
+
+	private final Logger logger = LoggerFactory.getLogger("org.apache.geode");
+
+	@Bean
+	ApplicationRunner runner() {
+
+		return args -> {
+			this.logger.info("RUNNER RAN!");
+			//printLog();
+		};
+	}
+
+	@Bean
+	Log log() {
+		return this::logToString;
+	}
+
+	private String logToString() {
+		return stringAppender.getLogOutput();
+	}
+
+	private void printLog() {
+		System.out.printf("LOG [%s]%n", logToString());
+	}
+
+	@FunctionalInterface
+	interface Log {
+		String getContent();
+	}
+}

spring-geode-tests/smoke-tests/logging/src/test/java/example/app/geode/logging/ApacheGeodeLoggingApplicationSmokeTests.java

@@ -0,0 +1,55 @@
+/*
+ * Copyright 2019 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 example.app.geode.logging;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.data.gemfire.tests.integration.IntegrationTestsSupport;
+import org.springframework.test.context.junit4.SpringRunner;
+
+/**
+ * Smoke Tests for {@link ApacheGeodeLoggingApplication}.
+ *
+ * @author John Blum
+ * @see org.junit.Test
+ * @see org.springframework.boot.test.context.SpringBootTest
+ * @see org.springframework.data.gemfire.tests.integration.IntegrationTestsSupport
+ * @see org.springframework.test.context.junit4.SpringRunner
+ * @since 1.3.0
+ */
+@RunWith(SpringRunner.class)
+@SpringBootTest
+@SuppressWarnings("unused")
+public class ApacheGeodeLoggingApplicationSmokeTests extends IntegrationTestsSupport {
+
+	@Autowired
+	private ApacheGeodeLoggingApplication.Log log;
+
+	@Test
+	public void springApplicationLogsContent() {
+		assertThat(log.getContent()).containsSequence("RUNNER RAN!");
+	}
+
+	@Test
+	public void apacheGeodeLogsContent() {
+		assertThat(log.getContent()).containsSequence("Product-Name: Apache Geode");
+	}
+}