Add TestNG sample application

Add a TestNG sample that also demonstrates @WebIntegrationTest.

See gh-2135

spring-boot-samples/spring-boot-sample-testng/src/test/java/sample/testng/SampleTestNGApplicationTests.java

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+/*
+ * Copyright 2012-2015 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.testng;
+
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.boot.test.SpringApplicationConfiguration;
+import org.springframework.boot.test.TestRestTemplate;
+import org.springframework.boot.test.WebIntegrationTest;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.test.annotation.DirtiesContext;
+import org.springframework.test.context.testng.AbstractTestNGSpringContextTests;
+import org.testng.annotations.Test;
+
+import sample.testng.SampleTestNGApplication;
+import static org.testng.Assert.assertEquals;
+
+/**
+ * Basic integration tests for demo application.
+ *
+ * @author Phillip Webb
+ */
+@SpringApplicationConfiguration(classes = SampleTestNGApplication.class)
+@WebIntegrationTest("server.port:0")
+@DirtiesContext
+public class SampleTestNGApplicationTests extends AbstractTestNGSpringContextTests {
+
+	@Value("${local.server.port}")
+	private int port;
+
+	@Test
+	public void testHome() throws Exception {
+		ResponseEntity<String> entity = new TestRestTemplate().getForEntity(
+				"http://localhost:" + this.port, String.class);
+		assertEquals(HttpStatus.OK, entity.getStatusCode());
+		assertEquals("Hello World", entity.getBody());
+	}
+
+}