beAssignableTo<U> method
U?
beAssignableTo<U>()
Asserts that the object is assignable to a variable of type U
Implementation
U? beAssignableTo<U>() {
if (isReversed) {
Execute.assertion.forCondition(subject is U).failWith(
'$subjectLabel\n $subject\nshould not be a subbclass of\n `$U`\nbut does.',
);
} else {
Execute.assertion.forCondition(subject is! U).failWith(
'$subjectLabel\n $subject\nshould be a subbclass of\n `$U`\nbut does not',
);
}
try {
final x = subject as U;
return x;
} catch (e) {
// TODO: catch exact type cast error - example with List<String/Int/etc>
return null;
}
}