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packer_test: add convenience func for line count

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When building a pipeline to count the number of lines returned by
Packer, it can be a bit cumbersome to have to chain the calls to
MkPipeCheck to do that check, so we add one convenience function for the
simplest case: counting the number of lines on stdout, without any kind
of filtering.
This commit is contained in:
Lucas Bajolet 2024-05-16 10:25:36 -04:00 committed by Lucas Bajolet
parent c6388d4680
commit 3661d97fc0
1 changed files with 10 additions and 0 deletions
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10
packer_test/gadgets_test.go
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@ -158,3 +158,13 @@ func (c CustomCheck) Check(stdout, stderr string, err error) error {
func (c CustomCheck) Name() string {
return fmt.Sprintf("custom check - %s", c.name)
}
// LineCountCheck builds a pipe checker to count the number of lines on stdout by default
//
// To change the stream(s) on which to perform the check, you can call SetStream on the
// returned pipe checker.
func LineCountCheck(lines int) *PipeChecker {
return MkPipeCheck(fmt.Sprintf("line count (%d)", lines), LineCount()).
SetTester(IntCompare(eq, lines)).
SetStream(OnlyStdout)
}