Add test to spring-boot-sample-quartz

See gh-11621

spring-boot-samples/spring-boot-sample-quartz/pom.xml

@@ -19,6 +19,11 @@
 			<groupId>org.springframework.boot</groupId>
 			<artifactId>spring-boot-starter-quartz</artifactId>
 		</dependency>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-test</artifactId>
+			<scope>test</scope>
+		</dependency>
 	</dependencies>
 	<build>
 		<plugins>

spring-boot-samples/spring-boot-sample-quartz/src/test/java/sample/quartz/SampleQuartzApplicationTests.java

@@ -0,0 +1,43 @@
+/*
+ * Copyright 2012-2018 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 sample.quartz;
+
+import org.junit.Rule;
+import org.junit.Test;
+
+import org.springframework.boot.test.rule.OutputCapture;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Tests for {@link SampleQuartzApplication}.
+ *
+ * @author Eddú Meléndez
+ */
+public class SampleQuartzApplicationTests {
+
+	@Rule
+	public OutputCapture outputCapture = new OutputCapture();
+
+	@Test
+	public void test() {
+		SampleQuartzApplication.main(new String[0]);
+		String output = this.outputCapture.toString();
+		assertThat(output).contains("Hello World!");
+	}
+
+}