testland/kotest-tests
Configures and runs Kotest - Kotlin-native test framework with multiple specification styles (StringSpec, FunSpec, BehaviorSpec, DescribeSpec, ShouldSpec, FreeSpec, FeatureSpec, ExpectSpec, AnnotationSpec); rich matcher library; built-in property-based testing (alternative to jqwik); coroutines support; data-driven testing; isolation modes per-spec or per-test; integrates with Gradle JVM test task. Use when working with Kotlin and wanting Kotlin-idiomatic DSL over JUnit 5's annotation-driven approach. Matchers (shouldBe, shouldContain) are bundled with the runner and are not a drop-in replacement for a standalone JVM assertion library; for assertion-only use paired with JUnit 5 / TestNG / Spock see assertj.
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matchers-and-isolation.mdreferences/
Kotest - matchers and isolation modes
Matchers
Per kotest.io/docs/assertions/matchers.html:
Core matchers:
| Matcher | Use |
|---|---|
value shouldBe expected | Equality |
value shouldNotBe expected | Inequality |
value should be(expected) | Same; alternate syntax |
value.shouldBeNull() / shouldNotBeNull() | Null check |
string.shouldContain("substring") | String membership |
string.shouldStartWith("prefix") / shouldEndWith("suffix") | String pos |
string.shouldMatch(regex) | Regex |
list.shouldHaveSize(3) / shouldContainExactly(...) / shouldContainAll(...) | Collection |
map.shouldContainKey("key") / shouldContainValue("v") | Map |
value.shouldBeInstanceOf<MyClass>() | Type |
result.shouldBeSuccess() / shouldBeFailure() | Kotlin Result |
shouldThrow<E> { ... } | Exception |
Isolation modes
Per kotest.io/docs/framework/isolation-mode.html:
Four modes (default SingleInstance):
| Mode | Behavior |
|---|---|
SingleInstance | One spec instance for all tests (default; fastest) |
InstancePerTest | Fresh spec instance per test (incl. nested contexts) |
InstancePerLeaf | Fresh spec instance per leaf-test only |
Set per-spec:
class StatefulTest : StringSpec({
isolationMode = IsolationMode.InstancePerTest
// ...
})Or globally via AbstractProjectConfig.