tests: split cli/tests to separate crate, remove test-fakes feature (PoC) #4622
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This fixes real dependency cycle that would expose slightly different versions of jj_lib types to unit tests, one from super::* and another from testutils::*. The testutils dependency will be removed by splitting lib/tests to a separate crate.
This breaks dev-dependency cycle: jj-lib -> testutils -> jj-lib. I put Cargo.toml in lib/tests so the directory structure looks familiar. I'm not sure if this layout is common, but I found this pattern in gix.
…PoC) The goal is to remove the crate-cycle: `jj-cli --(dev)--> jj-cli`. Since there's no way to express binary dependency in Cargo.toml, all binaries which the tests depend on should have to be built within the same crate. I put Cargo.toml in cli/tests so the directory structure looks familiar. One big caveat: since we build a separate "jj" binary for tests, the production "jj" binary is no longer covered by these tests. We might want to leave a couple of tests in jj-cli to ensure that the real "jj" binary works.
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The goal is to remove the crate-cycle:
jj-cli --(dev)--> jj-cli. Since there's no way to express binary dependency in Cargo.toml, all binaries which the tests depend on should have to be built within the same crate.I put Cargo.toml in cli/tests so the directory structure looks familiar.
One big caveat: since we build a separate "jj" binary for tests, the production "jj" binary is no longer covered by these tests. We might want to leave a couple of tests in jj-cli to ensure that the real "jj" binary works.
Checklist
If applicable:
CHANGELOG.md