Add support for collecting stdout and stderr in an exit test.
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grynspan
added
enhancement
grynspan
requested review from
stmontgomery,
dennisweissmann,
briancroom,
SeanROlszewski and
suzannaratcliff
as code owners
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grynspan
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Oct 19, 2024
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This PR adds `stdout` and `stderr` capture to exit tests.
Gathering these streams can be very expensive, so they are _opt-in_. There is a
new argument to `#expect(exitsWith:)`, `observedValues`, to which you can pass
one or more key paths on `ExitTest.Result` to indicate which bits you want:
```swift
let result = await #expect(exitsWith: .failure, observing: [\.standardOutputContent]) {
print("Goodbye, world!")
fatalError()
}
#expect(result.standardOutputContent.contains(UInt8(ascii: "G")))
```
Some changes to pipes were needed to satisfy the compiler's concerns about
`Pipe` being a move-only type that contains other move-only types—now it's just
a function that returns two `FileHandle` instances. This is simpler anyway.
It is possible some callers will want `stdout` and `stderr` to be set, but to
something other than a pipe (such as a file on disk or a PTY.) While these are
interesting cases, they are beyond the scope of this PR.
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stmontgomery
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Oct 22, 2024
stmontgomery
approved these changes
Oct 22, 2024
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This PR adds
stdoutandstderrcapture to exit tests.Gathering these streams can be very expensive, so they are opt-in. There is a new argument to
#expect(exitsWith:),observedValues, to which you can pass one or more key paths onExitTest.Resultto indicate which bits you want:Some changes to pipes were needed to satisfy the compiler's concerns about
Pipebeing a move-only type that contains other move-only types—now it's just a function that returns twoFileHandleinstances. This is simpler anyway.It is possible some callers will want
stdoutandstderrto be set, but to something other than a pipe (such as a file on disk or a PTY.) While these are interesting cases, they are beyond the scope of this PR.Checklist: