Kass
0.4.1indexedFacilitates writing assertions and assumptions in tests, offering fluent syntax and error handling for failed assumptions, enabling seamless test execution and validation scenarios.
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Facilitates writing assertions and assumptions in tests, offering fluent syntax and error handling for failed assumptions, enabling seamless test execution and validation scenarios.
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Kotlin Common Assertions
Kass is a multiplatform library, supporting JVM, Android, iOS (x64, ARM, Simulator-ARM), JS.
assertThat(subject, statement) and assumeThat(subject, statement) both evaluate the given subject against a given statement, which can be written in a fluent style using the provided statement functions.
When an assumption fails, the test execution will stop at that point, throwing a FailedAssumption error.
To catch this error and fail silently, use testScenario(subjects) which takes a collection that
provides subjects and a lambda executed on a Scenario object that wraps each subject.
Use testHypothesis() to run a single test without an implicit subject.
When an assertion fails, tests fail normally.
fun some_hypothesis() = testHypothesis() {
// Given a non-null subject
val given = "a"
assumeThat(given, isNotNull())
// When some operation is performed
val result = lengthOperation(given)
// Then the result is as expected
assertThat(result, isEqualTo(1))
}
private val subjectList = listOf(null, "a", "b", "c")
fun some_scenario() = runScenario(subjectList) {
// Given a non-null subject
assumeThat(subject, isNotNull())
// When some operation is performed
val result = someOperation(subject)
// Then the result is as expected
assertThat(result, isEqualTo(expectedValue))
}