extractSubject
Extracts the subject of this Expect in case it is defined and passes it to the given assertionCreator or adds a failing assertion to this Expect in case the subject is absent (e.g. due to a previous extraction failure).
Use the overload which expects an FailureDescriptionWithCreator if you want to use a custom failure description in case the subject extraction is not possible as it is absent.
Return
an Expect for the subject of this expectation.
Since
1.2.0
Parameters
The assertion-creator lambda which is responsible to create and append at least 1 assertion to this Expect.
Samples
val persons = dataGenerator.getRandomPersonsWithChildren()
expect(persons).toHaveElementsAndAll {
extractSubject { person ->
feature { f(it::children) }.notToHaveElementsOrAll {
because("person should at least be 16 years older than its children") {
feature { f(it::age) }.toBeLessThan(person.age - 16)
}
}
}
}Extracts the subject of this Expect in case it is defined and passes it to the given FailureDescriptionWithCreator.assertionCreator or adds a failing assertion to this Expect in case the subject is absent (e.g. due to a previous extraction failure) using the given FailureDescriptionWithCreator.failureDescription.
Use the function withFailureDescription(String) { ... } to create an FailureDescriptionWithCreator.
Return
an Expect for the subject of this expectation.
Since
1.2.0
Parameters
The parameter object which contains the FailureDescriptionWithCreator.failureDescription and FailureDescriptionWithCreator.assertionCreator. Use the function withFailureDescription(String) { ... } to create an FailureDescriptionWithCreator.
Samples
// you can use withFailureDescription if you want to specify a custom failure description instead of using
// the default one.
// imagine the data generator should not return an empty list
val persons = dataGenerator.getRandomPersonsHasABugReturnsEmptyList()
fails { // because persons is empty
expect(persons).toHaveElementsAndAll { // fails
// hence the sub-expectations within extractSubject cannot be evaluated
// and instead we show the custom failure description
this extractSubject withFailureDescription("no person defined, cannot extract subject") { person ->
feature { f(it::children) }.notToHaveElementsOrAll {
because("person should at least be 16 years older than its children") {
feature { f(it::age) }.toBeLessThan(person.age - 16)
}
}
}
}
}