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Pure Functional HTTP APIs in Scala

Testing the Routes: Use Case - Loading

Explore how to test HTTP routes in Scala by loading non-existing and existing products. Understand handling empty responses and validating correct data retrieval through unit and integration tests.

We'll cover the following...

Load a non-existing product

Let’s write a test for our first use case: loading a product!

Again, we will use the beforeEach and afterEach helpers to clean up our database. Let’s take a look at a test for loading a product that does not exist.

Scala
"Loading a Product by ID" when {
  "the ID does not exist" must {
    val expectedStatus = StatusCodes.NotFound
    
    s"return $expectedStatus" in {
      val id = UUID.randomUUID
      
      for {
        resp <- http.singleRequest(
          HttpRequest(
            method = HttpMethods.GET,
            uri = s"$baseUrl/product/$id",
            headers = Seq(),
            entity = HttpEntity(
              contentType = ContentTypes.`application/json`,
              data = ByteString("")
            )
          )
        )
      } yield {
        resp.status must be(expectedStatus)
      }
    }
  }
}

Maybe a bit verbose, but we make a real HTTP request, and check the response ...