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Version: 6.0

Introduction

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Test with Style​

Write simple and beautiful tests using one of the available styles:

class MyTests : FunSpec({
  test("length should return size of string") {
    "hello".length shouldBe 5
  }
  test("startsWith should test for a prefix") {
    "hello world" should startWith("hello")
  }
})

Kotest allows tests to be created in several styles, so you can choose the style that suits you best.

Check all the Tricky Cases With Data Driven Testing​

Handle even an enormous amount of input parameter combinations easily with data driven tests:

class DataTestExample : FreeSpec({
   "maximum of two numbers" {
      withData(
         Triple(1, 5, 5),
         Triple(1, 0, 1),
         Triple(0, 0, 0)
      ) { (a, b, max) ->
         Math.max(a, b) shouldBe max
      }
   }
})

Fine Tune Test Execution​

You can specify the number of invocations, parallelism, and a timeout for each test or for all tests. And you can group tests by tags or disable them conditionally. All you need is config:

class MySpec : DescribeSpec({
   describe("should use config").config(timeout = 2.seconds, invocations = 10, tags = setOf(Database, Linux)) {
      // test here
   }
})