# HG changeset patch
# User Raphaël Gomès <rgomes@octobus.net>
# Date 2020-09-24 14:30:00
# Node ID 952f9d37002c43304196020a75f1b28f37a16877
# Parent  10284ce3d5ed9abe6384c47d238cf2e0b9d11d62

rust-tests: add test to check if `Cargo.lock` is up-to-date

An out-of-date `Cargo.lock` is the source of rebase conflicts, prevents a
reproductible build, introduces desync between the series that introduces a
change in dependencies and the one that eventually commits the `Cargo.lock`,
and is just a general annoyance.

This commit demonstrates that the test works, the next one fixes the
currently out-of-date `Cargo.lock`.

Differential Revision: https://phab.mercurial-scm.org/D9079

diff --git a/tests/hghave.py b/tests/hghave.py
--- a/tests/hghave.py
+++ b/tests/hghave.py
@@ -1066,6 +1066,11 @@ def has_rustfmt():
     )
 
 
+@check("cargo", "cargo tool")
+def has_cargo():
+    return matchoutput('`rustup which cargo` --version', b'cargo')
+
+
 @check("lzma", "python lzma module")
 def has_lzma():
     try:
diff --git a/tests/test-check-cargo-lock.t b/tests/test-check-cargo-lock.t
new file mode 100644
--- /dev/null
+++ b/tests/test-check-cargo-lock.t
@@ -0,0 +1,11 @@
+#require cargo test-repo
+  $ . "$TESTDIR/helpers-testrepo.sh"
+  $ cd "$TESTDIR"/../rust
+
+Check if Cargo.lock is up-to-date. Will fail with a 101 error code if not.
+
+  $ cargo check --locked --all --quiet
+
+However most CIs will run `cargo build` or similar before running the tests, so we need to check if it was modified
+
+  $ testrepohg diff