This style assumes the use of the following DSL blocks:

• given: This block defines the context of our test. It can be a class that we want to test.
• on: This block defines the function or action that we want to test.
• it: This block defines an actual test. It can be the input or output of a function.

Let's test the set method of the ToDoStorage class. This test may look as follows:

@RunWith(JUnitPlatform::class)
object ToDoSpek : Spek({
    given("A storage") {
        val storage = ToDoStorage()
        on("set a todo with with args: name and context") {
            val todo = ToDo("name", "content")
            val result = storage.set("name", todo)
            it("returns true") {
                assert(result)
            }
        }
    }
})

Press the Run button and you will see the following window:

As you can see, the output not only shows that a test has passed successfully, but also contains a description of the test case. We can add one more block to test the get method. This test may look as follows:

on("""get a todo by "name" key""") {
    val todo = storage["name"]
    it("""returns a todo with "content" """) {
        assertEquals("content", todo?.content)
    }
}

The run window looks as follows:

You can add as many on blocks as you want. You can also create different context blocks in the same Spek class.