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cmd/cue: add a test case for loading an empty YAML file
For #3744.
Signed-off-by: Daniel Martí <mvdan@mvdan.cc>
Change-Id: Ib88931e2ca7a551e5d80b9c468b13ca318fc60ec
Reviewed-on: https://review.gerrithub.io/c/cue-lang/cue/+/1211359
Unity-Result: CUE porcuepine <cue.porcuepine@gmail.com>
TryBot-Result: CUEcueckoo <cueckoo@cuelang.org>
Reviewed-by: Roger Peppe <rogpeppe@gmail.com>
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cmd/cue/cmd/testdata/script/empty_yaml.txtar
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cmd/cue/cmd/testdata/script/empty_yaml.txtar
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# Empty YAML files by themselves decode as null, following the YAML spec.
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# However, for the sake of the user experience when joining with other YAML files,
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# we allow unifying with them as well. This is done by decoding empty YAML as `*null | _`.
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# TODO: implement the above and make the second test case below work.
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exec cue export empty.yaml
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cmp stdout export-empty.stdout
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! exec cue export one.yaml empty.yaml two.yaml
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cmp stderr export-all.stderr
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-- export-empty.stdout --
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null
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-- export-all.stderr --
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conflicting values null and {two:"two text"} (mismatched types null and struct):
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./two.yaml:1:1
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-- one.yaml --
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one: "one text"
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-- empty.yaml --
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-- two.yaml --
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two: "two text"