Assert a file matches a fixture on disk

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Things to assert

• file type
• file content

others?

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Possible Requirements

• Doesn't need to solve everything because we have from_path for people to do complex predicates
• Defaults to loading as [u8] and checking equality
  • Handle large binary files (chunking) (from dir-diff issues)
• Optionally enable text diffing
  • Normalize new lines (from dir-diff issues)
  • When messages are supported, show line diff (or word diff?)
• Scale API for diffing directories?

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Possible API

• eq_file(path): BinaryFilePredicate
• eq_file(path).str(): StrFilePredicate
  • eq_file(path).str().normalize_eol(yes: bool)

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Background: we'll also want a directory matches a directory on disk

• What can we reuse about the API, if any?

What if the API was instead eq_file(path, flags) where flags is a bitfield with the following

• STR
• NORMALIZE_EOL

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For dir-diff, some thing to check out

• https://github.com/assert-rs/dir-diff
• Expose a diffing iterator dir-diff#17
• https://github.com/cobalt-org/cobalt.rs/blob/master/tests/mod.rs#L27