Add Testcontainers

pom.xml

@@ -85,6 +85,21 @@
             <artifactId>spring-boot-starter-test</artifactId>
             <scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>org.testcontainers</groupId>
+            <artifactId>testcontainers</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.testcontainers</groupId>
+            <artifactId>junit-jupiter</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.testcontainers</groupId>
+            <artifactId>postgresql</artifactId>
+            <scope>test</scope>
+        </dependency>
     </dependencies>
 
     <build>

src/test/java/ch/dlmw/swisssignchallenge/SwisssignChallengeApplicationTests.java

@@ -1,8 +1,11 @@
 package ch.dlmw.swisssignchallenge;
 
+import ch.dlmw.swisssignchallenge.config.TestConfig;
 import org.junit.jupiter.api.Test;
 import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.context.annotation.Import;
 
+@Import(TestConfig.class)
 @SpringBootTest
 class SwisssignChallengeApplicationTests {
 

src/test/java/ch/dlmw/swisssignchallenge/config/TestConfig.java

@@ -0,0 +1,30 @@
+package ch.dlmw.swisssignchallenge.config;
+
+import javax.sql.DataSource;
+
+import org.springframework.boot.test.context.TestConfiguration;
+import org.springframework.context.annotation.Bean;
+import org.springframework.jdbc.datasource.DriverManagerDataSource;
+import org.testcontainers.containers.PostgreSQLContainer;
+
+@TestConfiguration
+public class TestConfig {
+    private static final PostgreSQLContainer<?> POSTGRES_CONTAINER = new PostgreSQLContainer<>("postgres:latest")
+            .withDatabaseName("testdb")
+            .withUsername("testuser")
+            .withPassword("testpass");
+
+    static {
+        POSTGRES_CONTAINER.start();
+    }
+
+    @Bean
+    public DataSource dataSource() {
+        var dataSource = new DriverManagerDataSource();
+        dataSource.setUrl(POSTGRES_CONTAINER.getJdbcUrl());
+        dataSource.setUsername(POSTGRES_CONTAINER.getUsername());
+        dataSource.setPassword(POSTGRES_CONTAINER.getPassword());
+        dataSource.setDriverClassName("org.postgresql.Driver");
+        return dataSource;
+    }
+}