ConversionViewModelProbeFailureTest's pickedProbe() helper held:
val ready = awaitState(viewModel.state, "Ready with a probe") {
it is ConversionState.Ready && it.input.probe != null
}
assertNull("nothing here should reach a terminal failure", (ready as? ConversionState.Failed))
The predicate requires `Ready`. `Ready` and `Failed` are sibling subtypes of one sealed
interface, so `ready as? Failed` is always null and the assertNull could never fire. R26
filed this PLAUSIBLE on types read; it is measured now.
Flipping the line to assertNotNull failed 3 of the 4 tests in the class -- three, because
pickedProbe() has three callers, which is also why a dead line here was worth removing
rather than shrugging at: it read as coverage in a helper the whole class depends on.
Deleted rather than replaced. There is nothing for a live assertion to add: a pick that
ended in Failed never satisfies the predicate, so awaitState fails on its timeout naming
what it was waiting for -- "Ready with a probe" -- which is a better failure message than
the assertion would have produced. The comment now says that, so the next reader does not
re-add the guard the predicate already is.
This is the ninth vacuous assertion this line of work has turned up, and the pattern is
consistent: they hide in helpers, they pass, and they look like care. The suite is green
before and after, which is exactly the point -- deleting a dead assertion cannot change a
result, and if it had, the line was not dead.
Closes#35.
JMR-dev
95902a7889