Athena strongly suggests following the SOLID design principles; especially the Dependency inversion principle in order to create types that are easy to test. See the Dependency Injection component for a more detailed look.
If these principles are followed then any controller/service can easily be unit tested on their own as you would any Crystal type, possibly utilizing ASPEC::TestCase to provide helpful abstractions around common testing/helper logic for sets of common types.
require "athena" require "athena/spec" class ExampleController < ART::Controller @[ARTA::QueryParam("negative")] @[ARTA::Get("/add/:value1/:value2")] def add(value1 : Int32, value2 : Int32, negative : Bool = false) : Int32 sum = value1 + value2 negative ? -sum : sum end end struct ExampleControllerTest < ART::Spec::APITestCase def test_add_positive : Nil self.request("GET", "/add/5/3").body.should eq "8" end def test_add_negative : Nil self.request("GET", "/add/5/3?negative=true").body.should eq "-8" end end # Run all test case tests. ASPEC.run_all
Integration tests allow testing the full system, including event listeners, param converters, etc at once. These tests do not utilize an HTTP::Server which results in more performant specs.