Verify each finding against the current code and only fix it if needed.

Nitpick comments:
In `@CODE_STYLE_GUIDE.md`:
- Around line 500-503: Clarify the ambiguity around "roughly 75 lines" for the
inline test module rule by specifying exactly what counts toward the line limit
for an inline `mod tests { ... }`: state whether blank lines, comment lines
(including doc comments like /// and //!), attribute lines (e.g. `#[test]`,
`#[cfg(...)]`), and `use`/`extern crate` statements are included or excluded,
and give a short example (e.g., "count all non-empty lines, including attributes
and doc comments, but exclude completely blank lines") so maintainers have an
unambiguous counting rule for `mod tests { ... }`.

Verify each finding against the current code and only fix it if needed.

Inline comments:
In `@crates/lockfile/src/save_lockfile/tests.rs`:
- Line 95: The test currently uses assert!(matches!(err,
SaveLockfileError::WriteFile(_))) without showing the actual error on failure;
update that assertion to include diagnostics by providing a custom message that
prints the actual err (e.g., change the assertion to assert!(matches!(err,
SaveLockfileError::WriteFile(_)), "unexpected SaveLockfileError: {:?}", err)) so
failures include the err value; refer to the SaveLockfileError value named err
and the existing matches! assertion to locate and replace the assertion.
- Around line 93-95: Replace the hardcoded absolute bad_path with a path
guaranteed to be missing inside a temp directory: create a temp dir (e.g. via
tempfile::tempdir()), build a nested non-existent path by joining a subdirectory
and "pnpm-lock.yaml" (do not create the subdirectory), call
empty_lockfile.save_to_path(the_missing_path) and expect_err, and assert it
matches SaveLockfileError::WriteFile(_); this makes the invalid-path test
deterministic across environments.

In `@crates/lockfile/src/snapshot_dep_ref/tests.rs`:
- Around line 88-97: The test looks_like_alias_rules uses bare assert! calls
which provide poor failure diagnostics; change it to a table-driven assertion
using the looks_like_alias_rules test and the looks_like_alias function: build a
list of (input, expected_bool) cases for strings like "5.1.2",
"17.0.2(react@17.0.2)", "string-width@4.2.3", "@types/react@17.0.49",
"react-dom@17.0.2(react@17.0.2)", "link:../foo", "workspace:*" and iterate
asserting assert_eq!(looks_like_alias(input), expected, "input = {}", input) so
failures show expected vs actual and the input that failed; alternatively
replace each assert! with assert_eq!(looks_like_alias("<str>"), <true|false>,
"input = <str>").

In `@crates/npmrc/src/custom_deserializer/tests.rs`:
- Around line 21-44: The first test (test_default_store_dir_with_pnpm_home)
currently mutates PNPM_HOME with an unsafe env::set_var call without using
EnvGuard; change it to snapshot the environment first like the other test by
calling let _g = EnvGuard::snapshot(["PNPM_HOME"]); then perform the env
mutation and assertion (you may keep the SAFETY comment and the unsafe block
around env::set_var if desired), so default_store_dir and display_store_dir are
exercised under EnvGuard serialization for soundness and consistency with
test_default_store_dir_with_xdg_env.

In `@crates/npmrc/src/workspace_yaml/tests.rs`:
- Line 58: Replace the platform-dependent string comparison with a direct
StoreDir value comparison: instead of asserting
npmrc.store_dir.display().to_string() == "/absolute/store", construct the
expected StoreDir (using the same constructor/pattern used at line 76) and
assert equality with npmrc.store_dir; reference the StoreDir type and the
npmrc.store_dir field to locate the assertion to change.

In `@crates/package-manager/src/install_package_from_registry/tests.rs`:
- Line 80: Before the assertion assert!(virtual_store_path.is_dir()) add
diagnostic logging that prints the path and its metadata (e.g., existence and
file type) so CI failures show context; specifically, log virtual_store_path and
results of virtual_store_path.exists() and virtual_store_path.metadata() (or use
dbg!/eprintln!/tracing::debug! as appropriate) immediately before the assert to
provide readable failure information for debugging.

In `@crates/package-manager/src/install/tests.rs`:
- Around line 55-65: The test contains plain assert! checks that lack diagnostic
context; before each assert! that verifies filesystem state (the calls using
project_root and is_symlink_or_junction, and checks on paths like
node_modules/.pacquet/@pnpm.e2e+hello-world-js-bin@1.0.0 and
node_modules/.pacquet/@pnpm+xyz@1.0.0) add brief logging (eprintln! or dbg!)
that prints the path and relevant metadata (exists(), is_dir(), and the result
of is_symlink_or_junction) so failures show current state; apply the same
pattern to any other non-assert_eq! assertions in this test file to follow the
CODE_STYLE_GUIDE.md testing guidance.
- Around line 417-469: Reset the process-global EVENTS vector before the test
run to avoid events leaking across retries: call EVENTS.lock().unwrap().clear()
(or replace the Mutex contents) at the start of the test (e.g., just before
creating RecordingReporter / before the Install.run::<RecordingReporter>()
invocation) so the static EVENTS is empty when RecordingReporter::emit pushes
new events; reference the static EVENTS and the RecordingReporter used in the
test to locate where to insert the clear call.

In `@crates/package-manager/src/link_file/tests.rs`:
- Around line 66-67: The failing tests use non-`assert_eq!` checks that lack
diagnostic output; before the `assert!(src_meta.nlink() >= 2, "hardlink should
bump nlink")` in tests.rs (and the similar checks around the other mentioned
spots), add a pre-assert diagnostic that prints the relevant values (e.g., call
dbg!/eprintln! on `src_meta.nlink()`, the full `src_meta`/`dst_meta` or symlink
metadata variables and any path variables) so CI failures show runtime values;
follow CODE_STYLE_GUIDE.md by using simple prints for scalars and `dbg!` for
complex structs and place them immediately before the `assert!`/`assert_ne!`
invocations.

In `@crates/package-manifest/src/tests.rs`:
- Around line 30-31: Before each non-assert_eq! assertion (e.g., the assertions
calling tmp.exists() and tmp.is_file(), and the other assert!/assert_ne! sites
mentioned), add a diagnostic log that prints the actual values and context so
failures are easier to debug; specifically, emit a message (using eprintln! or
the test crate's logger) showing tmp.display() and the boolean results of
tmp.exists() and tmp.is_file() immediately before the assert! calls, and do the
same pattern for the other assert!/assert_ne! checks referenced so the test
output contains the actual vs expected values when an assertion fails.
- Line 69: The test currently calls manifest.script("test", false).unwrap() but
only verifies success; change it to capture the returned value (e.g., let script
= manifest.script("test", false).unwrap();) and add an assertion that the
returned script equals the expected string (assert_eq!(script, "<expected script
string>")), replacing "<expected script string>" with the actual script you
expect for the "test" entry so regressions in the returned value are caught;
reference the manifest.script("test", false) call and the resulting variable
name when adding the assertion.

In `@crates/store-dir/src/check_pkg_files_integrity/tests.rs`:
- Around line 58-60: The tests have several assert! / assert_ne! checks that
lack runtime context, making CI failures hard to diagnose; before each
non-assert_eq! assertion (e.g., the block with result, the lookup
result.files_map.get("index.js") and the path.exists() assertion) add a
diagnostic print such as eprintln! or dbg! that prints the relevant values
(e.g., the entire result, the files_map entry, the resolved PathBuf, and any
cache/state variables used in the test) so failures will show runtime context;
apply the same pattern to the other assertion sites referenced (lines around 83,
96–97, 117–119, 134–136, 154–155, 184–186, 193–197, 214–215, 226–229, 246–248,
268–273, 285–287) by inserting a short eprintln!/dbg! immediately before each
assert! / assert_ne! that logs the symbols used in that assertion.

---

Nitpick comments:
In `@crates/fs/src/ensure_file/tests.rs`:
- Around line 108-109: Before each non-assert_eq! boolean assertion (e.g., the
assert! that checks name.starts_with("cdefx") which uses the variable name), add
an eprintln! that prints the actual and expected values (for example: the
runtime value of name and the expected prefix) so test-failure output shows
context; do the same for the other boolean assertions mentioned (the checks in
the groups at 118-120, 141-148, 163-167, 190-194, 235-236, 249-254, 277-282) by
emitting concise diagnostic lines that show the relevant variables/expected
values immediately before the assert!/assert_ne! calls (use the same variable
names and expectations found in those assertions).

In `@crates/npmrc/src/workspace_yaml/tests.rs`:
- Line 23: The test contains a non-descriptive assert!
(assert!(matches!(settings.node_linker, Some(NodeLinker::Hoisted)))) which
should include diagnostics; update the test(s) in workspace_yaml::tests
(symbols: settings, node_linker, NodeLinker::Hoisted and the other mentioned
assertions) to either convert to assert_eq! when comparing scalars or log the
actual values just before the assert (e.g., using dbg! or a test-specific
eprintln!/log macro) so failures show settings.node_linker and related values;
apply the same pattern to the other asserted locations referenced (lines
covering the other matches/asserts) to ensure actionable test failure output.

In `@crates/package-manager/src/build_snapshot/tests.rs`:
- Around line 52-53: The tests use bare assert!/matches! calls for
built.metadata.resolution (matching LockfileResolution::Registry(_)) and
built.snapshot.dependencies (is_none()) without contextual output; before each
non-assert_eq! assertion (e.g., the checks referencing
built.metadata.resolution, LockfileResolution::Registry, and
built.snapshot.dependencies and the similar assertion around line 77), add
diagnostic logging that prints the relevant values (for example print or
eprintln the built struct or the specific fields) so test failures show the
actual values; follow the repo test-logging rule by emitting these diagnostics
immediately before the assert so failures are diagnosable.

In `@crates/store-dir/src/cas_file/tests.rs`:
- Around line 42-55: Add lightweight test-context logging immediately before the
assert! checks that verify cas_file_path_by_mode results: print the mode
(octal), hex, generated path, and relevant shard byte info using eprintln! so
failures show concrete values; specifically, before each assert! that checks
path.to_string_lossy().ends_with("-exec") (and the inverse checks), call
eprintln! with mode, hex, path, and any shard byte used by cas_file_path_by_mode
(e.g., first byte of hex) to aid triage — do the same for the other assert!
blocks referenced (the checks around the same pattern later in the test).

In `@crates/store-dir/src/store_dir/tests.rs`:
- Around line 35-43: Before the looped assert! checks, add eprintln! calls that
print diagnostic context: the shard hex name, the full shard path
(files.join(&name).display()), and the result of
store.shard_already_ensured(shard) so failures show state before panicking.
Locate the loop that iterates shard (variable shard, name =
format!("{shard:02x}"), files, and store.shard_already_ensured) and insert
eprintln! lines immediately before each assert! (and repeat the same pattern for
the similar loops around the other assertions mentioned) to log shard path/state
and the boolean cache check.

In `@crates/store-dir/src/store_index/tests.rs`:
- Around line 53-55: Add explicit logs immediately before the non-assert_eq!
assertions: bind the key string ("sha512-never\tnone@0.0.0") to a local
variable, call idx.get(key) and idx.contains_key(key) into temporaries, log
their values (e.g., via eprintln! or tracing::debug!) with the key and returned
Option/Result for context, then run the existing assert!(...is_none()) and
assert!(!...). Apply the same pattern to the other occurrences that use
idx.get(...) and idx.contains_key(...) (the blocks around the other listed
checks) so each non-assert_eq! map-membership/emptiness assertion has a
preceding log showing the key and result.