[PATCH] t0303: check that helper_test_clean removes all credentials
On Thu, Feb 15, 2024 at 09:22:27AM -0800, Junio C Hamano wrote:
> > I wonder if we might want something like this, as well, which can catch
> > leftovers:
>
> Sounds like a good hygiene ;-).
Unfortunately, it is not quite so simple. There are a bunch of other tests run by t0303 that are not in t0302, because credential-store does not support caching, expiration, etc.
Putting it in t0301 would be better, but we don't have a way to inspect the internal state of the cache daemon. We could perhaps add one, but here's an even hackier solution. ;)
-- >8 --
Subject: [PATCH] t0303: check that helper_test_clean removes all credentials
Our lib-credential.sh library comes with a "clean" function that removes all of the credentials used in its tests (to avoid leaving cruft in system credential storage). But it's easy to add a test that uses a new credential but forget to add it to the clean function. E.g., the case fixed by 83e6eb7d7a (t/lib-credential: clean additional credential, 2024-02-15).
We should be able to catch this automatically, but it's a little tricky.
We can't just compare the contents of the helper's storage before and after the test run, because there isn't a way to ask a helper to dump all of its storage. And in most cases we don't have direct access to the underlying storage (since the whole point of the helper is to abstract that away). We can work around that by using our own "store" helper, since we can directly inspect its state by looking at its on-disk file.
But there's a catch: the "store" helper doesn't support features like caching or expiration, so using it naively fails tests (and skipping those tests would give us incomplete coverage). Implementing all of those features would be non-trivial. But we can hack around that by overriding the "check" function used by the tests to turn most requests into noop success (except for "approve" requests, which actually store things).
And then at the end we can check that running the "clean" function takes us back to an empty state.
Note that because we've skipped any tests that erase credentials (because of our noop check function), the state we see at cleanup time may be larger than it would be normally. That's OK. The point of the clean function is to clean up any cruft we _might_ have left in place, so we're just being doubly thorough.
The way this is bolted onto t0303 feels a little messy. But it's really the best place to do it, because then we know that it is running the exact sequence of tests that we'd use for testing a real external helper. In a normal run of "make test" it currently does nothing (the idea is that you run it manually after pointing it at some helper program). But now with this patch, "make test" will sanity-check the script itself.
Signed-off-by: Jeff King <peff@peff.net>
---
This should be applied on top of ba/credential-test-clean-fix,
naturally, or it will fail. :)
t/t0303-credential-external.sh | 26 ++++++++++++++++++++++++--
1 file changed, 24 insertions(+), 2 deletions(-)
Show changes to t/t0303-credential-external.sh +24 −2
diff --git a/t/t0303-credential-external.sh b/t/t0303-credential-external.sh
index 095574bfc6..72ae405c3e 100755
--- a/t/t0303-credential-external.sh
+++ b/t/t0303-credential-external.sh
@@ -32,9 +32,24 @@ commands.
. ./test-lib.sh
. "$TEST_DIRECTORY"/lib-credential.sh
+# If we're not given a specific external helper to run against,
+# there isn't much to test. But we can still run through our
+# battery of tests with a fake helper and check that the
+# test themselves are self-consistent and clean up after
+# themselves.
+#
+# We'll use the "store" helper, since we can easily inspect
+# its state by looking at the on-disk file. But since it doesn't
+# implement any caching or expiry logic, we'll cheat and override
+# the "check" function to just report all results as OK.
if test -z "$GIT_TEST_CREDENTIAL_HELPER"; then
- skip_all="used to test external credential helpers"
- test_done
+ GIT_TEST_CREDENTIAL_HELPER=store
+ GIT_TEST_CREDENTIAL_HELPER_TIMEOUT=store
+ check () {
+ test "$1" = "approve" || return 0
+ git -c credential.helper=store credential approve
+ }
+ check_cleanup=t
fi
test -z "$GIT_TEST_CREDENTIAL_HELPER_SETUP" ||
@@ -59,4 +74,11 @@ fi
# might be long-term system storage
helper_test_clean "$GIT_TEST_CREDENTIAL_HELPER"
+if test "$check_cleanup" = "t"
+then
+ test_expect_success 'test cleanup removes everything' '
+ test_must_be_empty "$HOME/.git-credentials"
+ '
+fi
+
test_done
--
2.44.0.rc1.410.g8325d5f159
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