chore: add testcontainers

backend/build.gradle.kts

@@ -42,9 +42,11 @@ dependencies {
     implementation("io.projectreactor.kotlin:reactor-kotlin-extensions")
     implementation("com.fasterxml.jackson.module:jackson-module-kotlin")
     // Testing
-    testImplementation("io.projectreactor:reactor-test")
     testImplementation("org.springframework.boot:spring-boot-starter-test")
+    testImplementation("org.springframework.boot:spring-boot-testcontainers")
+    testImplementation("io.projectreactor:reactor-test")
     testImplementation("org.testcontainers:mongodb")
+    testImplementation("org.testcontainers:junit-jupiter")
 
     // Misc
     implementation("com.netflix.graphql.dgs:graphql-dgs-webflux-starter")

backend/src/test/kotlin/opensource/h3nryc0ding/playground/BackendApplicationTest.kt

@@ -1,11 +1,28 @@
 package opensource.h3nryc0ding.playground
 
+import org.junit.jupiter.api.Assertions.assertTrue
 import org.junit.jupiter.api.Test
 import org.springframework.boot.test.context.SpringBootTest
+import org.springframework.boot.testcontainers.service.connection.ServiceConnection
+import org.testcontainers.containers.MongoDBContainer
+import org.testcontainers.junit.jupiter.Container
+import org.testcontainers.junit.jupiter.Testcontainers
 
-@SpringBootTest
+@Testcontainers
+@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
 class BackendApplicationTest {
+    companion object {
+        @Container
+        @ServiceConnection
+        val mongo = MongoDBContainer("mongo:latest")
+    }
+
     @Test
     fun contextLoads() {
     }
+
+    @Test
+    fun `mongo is running`() {
+        assertTrue(mongo.isRunning)
+    }
 }