add test-containers module

testing-modules/test-containers/README.md

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+### Relevant Articles:
+- [Docker Test Containers in Java Tests](TODO link to be added.)

testing-modules/test-containers/pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+	<modelVersion>4.0.0</modelVersion>
+
+	<!-- NOT NEEDED - JSP <groupId>com.baeldung</groupId> -->
+	<artifactId>test-containers</artifactId>
+	<version>1.0-SNAPSHOT</version>
+
+	<name>test-containers</name>
+	<description>Intro to Java Test Containers</description>
+
+	<parent>
+		<groupId>com.baeldung</groupId>
+		<artifactId>parent-modules</artifactId>
+		<version>1.0.0-SNAPSHOT</version>
+		<relativePath>../../</relativePath>
+	</parent>
+
+
+	<build>
+		<resources>
+			<resource>
+				<directory>src/test/resources</directory>
+				<filtering>true</filtering>
+			</resource>
+		</resources>
+		<plugins>
+			<plugin>
+				<artifactId>maven-surefire-plugin</artifactId>
+				<version>${maven-surefire-plugin.version}</version>
+				<dependencies>
+					<dependency>
+						<groupId>org.junit.platform</groupId>
+						<artifactId>junit-platform-surefire-provider</artifactId>
+						<version>${junit.platform.version}</version>
+					</dependency>
+				</dependencies>
+			</plugin>
+			<plugin>
+				<groupId>org.codehaus.mojo</groupId>
+				<artifactId>exec-maven-plugin</artifactId>
+				<version>1.6.0</version>
+				<executions>
+					<execution>
+						<goals>
+							<goal>java</goal>
+						</goals>
+					</execution>
+				</executions>
+				<configuration>
+					<mainClass>com.baeldung.TestLauncher</mainClass>
+				</configuration>
+			</plugin>
+		</plugins>
+	</build>
+
+	<dependencies>
+		<dependency>
+			<groupId>org.junit.platform</groupId>
+			<artifactId>junit-platform-runner</artifactId>
+			<version>${junit.platform.version}</version>
+			<scope>test</scope>
+		</dependency>
+		<dependency>
+			<groupId>org.junit.vintage</groupId>
+			<artifactId>junit-vintage-engine</artifactId>
+			<version>${junit.vintage.version}</version>
+			<scope>test</scope>
+		</dependency>
+		<dependency>
+			<groupId>org.apache.logging.log4j</groupId>
+			<artifactId>log4j-core</artifactId>
+			<version>${log4j2.version}</version>
+		</dependency>
+		<dependency>
+			<groupId>org.testcontainers</groupId>
+			<artifactId>testcontainers</artifactId>
+			<version>1.7.2</version>
+		</dependency>
+		<dependency>
+			<groupId>org.testcontainers</groupId>
+			<artifactId>postgresql </artifactId>
+			<version>1.7.2</version>
+		</dependency>
+		<dependency>
+			<groupId>org.postgresql</groupId>
+			<artifactId>postgresql</artifactId>
+			<version>42.2.2</version>
+		</dependency>
+
+	</dependencies>
+
+	<properties>
+		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+		<java.version>1.8</java.version>
+		<junit.jupiter.version>5.1.0</junit.jupiter.version>
+		<junit.platform.version>1.0.1</junit.platform.version>
+		<junit.vintage.version>4.12.1</junit.vintage.version>
+		<log4j2.version>2.8.2</log4j2.version>
+		<h2.version>1.4.196</h2.version>
+		<mockito.version>2.11.0</mockito.version>
+
+		<maven-compiler-plugin.version>3.7.0</maven-compiler-plugin.version>
+		<maven-surefire-plugin.version>2.19.1</maven-surefire-plugin.version>
+		<spring.version>5.0.1.RELEASE</spring.version>
+	</properties>
+
+</project>

testing-modules/test-containers/src/test/java/com/baeldung/testconainers/GenericContainerTests.java

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+package com.baeldung.testconainers;
+
+import static org.junit.Assert.assertEquals;
+
+import java.io.BufferedReader;
+import java.io.InputStreamReader;
+import java.net.HttpURLConnection;
+import java.net.URL;
+
+import org.junit.ClassRule;
+import org.junit.Test;
+import org.junit.platform.commons.annotation.Testable;
+import org.testcontainers.containers.GenericContainer;
+
+@Testable
+public class GenericContainerTests {
+    @ClassRule
+    public static GenericContainer simpleWebServer = new GenericContainer("alpine:3.2")
+        .withExposedPorts(80)
+        .withCommand("/bin/sh", "-c", "while true; do echo " 
+              + "\"HTTP/1.1 200 OK\n\nHello World!\" | nc -l -p 80; done");
+
+    @Test
+    public void givenSimpleWebServerContainer_whenGetReuqest_thenReturnsResponse() throws Exception {
+        String address = "http://" + simpleWebServer.getContainerIpAddress() + ":" + simpleWebServer.getMappedPort(80);
+        String response = simpleGetRequest(address);
+        assertEquals(response, "Hello World!");
+    }
+
+    private String simpleGetRequest(String address) throws Exception {
+        URL url = new URL(address);
+        HttpURLConnection con = (HttpURLConnection) url.openConnection();
+        con.setRequestMethod("GET");
+
+        BufferedReader in = new BufferedReader(new InputStreamReader(con.getInputStream()));
+        String inputLine;
+        StringBuffer content = new StringBuffer();
+        while ((inputLine = in.readLine()) != null) {
+            content.append(inputLine);
+        }
+        in.close();
+
+        return content.toString();
+    }
+}

testing-modules/test-containers/src/test/java/com/baeldung/testconainers/PostgreSqlContainerTests.java

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+package com.baeldung.testconainers;
+
+import static org.junit.Assert.assertEquals;
+
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.platform.commons.annotation.Testable;
+import org.testcontainers.containers.PostgreSQLContainer;
+
+@Testable
+public class PostgreSqlContainerTests {
+    @Rule
+    public PostgreSQLContainer postgresContainer = new PostgreSQLContainer();
+
+    @Test
+    public void whenSelectQueryExecuted_thenResulstsReturned() throws Exception {
+        ResultSet resultSet = performQuery(postgresContainer, "SELECT 1");
+        resultSet.next();
+        int result = resultSet.getInt(1);
+        assertEquals(1, result);
+    }
+
+    private ResultSet performQuery(PostgreSQLContainer postgres, String query) throws SQLException {
+        String jdbcUrl = postgres.getJdbcUrl();
+        String username = postgres.getUsername();
+        String password = postgres.getPassword();
+        Connection conn = DriverManager.getConnection(jdbcUrl, username, password);
+        return conn.createStatement()
+            .executeQuery(query);
+    }
+}