Testing Vert.x applications

To test our Vert.x application, we’ll use the JUnit 5 framework, which we discussed in the previous chapter.

You’ll need the following two dependencies in your build.gradle.kts file:

dependencies {
    ...
    testImplementation("io.vertx:vertx-junit5")
    testImplementation("org.junit.jupiter:junit-jupiter:5.9.1")
    testImplementation("org.jetbrains.kotlinx:kotlinx-coroutines-
    test:1.8.0")
}

Our first test will be located in the /src/test/kotlin/ServerTest.kt file.

The basic structure of all the integration tests looks something like this:

@TestInstance(TestInstance.Lifecycle.PER_CLASS)
class ServerTest {
    private val vertx: Vertx = Vertx.vertx()
    @BeforeAll
    fun setup() = runTest {
        vertx.deployVerticle(ServerVerticle()).coAwait()
    }
    @AfterAll
    fun tearDown() {
        // You want to stop your server once
        vertx.close()
    }
    
    @Test
    fun...