Kotest Assertion Mode

Assertion Mode controls what happens when a test runs without executing any assertions.
Tags:

Assertion Mode

When using the Kotest framework with Kotest assertions, you can make the build fail or print a warning to stderr if a test runs without executing any assertions.

To do this, set assertionMode to AssertionMode.Error or AssertionMode.Warn inside the spec.

For example:

import io.kotest.core.spec.style.FunSpec
import io.kotest.core.test.AssertionMode

class MySpec : FunSpec() {
    init {
        assertions = AssertionMode.Error
        test("this test has no assertions") {
            val name = "devkuma"
            name.length == 7 // this isn't actually testing anything
        }
    }
}

Running this test prints the following result:

Test 'this test has no assertions' did not invoke any assertions

It can also be configured globally through project configuration or with the system property kotest.framework.assertion.mode.

References