# Testing signals — diesel-rs/diesel

> Canonical page: https://codevetter.com/unpack/diesel/testing-signals

# Testing signals — diesel-rs/diesel

Scanned commit 5cdf54e1434b87084a4630c100249f1028f3e32d (2026-10-02). Generated by codevetter codevetter 1.15.0 on 2026-10-02.

Source inspection; upstream code and tests were not executed.

Tests and CI were inspected, not executed; no passing result or measured coverage is asserted. The repository combines Rust runtime tests, compile-failure diagnostics, procedural-macro snapshots, CLI subprocess tests, and fuzzing workflows. The inspected tests verify concrete database and generated-code behavior, with backend-specific conditions. This inventory is bounded and does not establish exhaustive coverage or whole-repository test gaps.
- diesel_tests registers integration modules for CRUD, associations, joins, raw SQL, transactions, migrations, instrumentation, types, views, and window functions, with some modules gated by backend features. — [diesel_tests/tests/lib.rs#L16-L74](https://github.com/diesel-rs/diesel/blob/5cdf54e1434b87084a4630c100249f1028f3e32d/diesel_tests/tests/lib.rs#L16-L74)
- Transaction tests inspect cross-connection visibility and rollback on returned errors; the visibility test explicitly excludes SQLite because it requires a file-backed database, and the rollback-error test is SQLite-specific. — [diesel_tests/tests/transactions.rs#L5-L35](https://github.com/diesel-rs/diesel/blob/5cdf54e1434b87084a4630c100249f1028f3e32d/diesel_tests/tests/transactions.rs#L5-L35) [diesel_tests/tests/transactions.rs#L44-L61](https://github.com/diesel-rs/diesel/blob/5cdf54e1434b87084a4630c100249f1028f3e32d/diesel_tests/tests/transactions.rs#L44-L61) [diesel_tests/tests/transactions.rs#L64-L92](https://github.com/diesel-rs/diesel/blob/5cdf54e1434b87084a4630c100249f1028f3e32d/diesel_tests/tests/transactions.rs#L64-L92)
- Despite its trybuild.rs filename, the compile-failure harness uses ui_test against tests/fail, normalizes diagnostic paths/text, and enables output blessing whenever BLESS exists; an inspected fixture rejects integer/string comparisons. — [diesel_compile_tests/tests/trybuild.rs#L4-L14](https://github.com/diesel-rs/diesel/blob/5cdf54e1434b87084a4630c100249f1028f3e32d/diesel_compile_tests/tests/trybuild.rs#L4-L14) [diesel_compile_tests/tests/trybuild.rs#L80-L102](https://github.com/diesel-rs/diesel/blob/5cdf54e1434b87084a4630c100249f1028f3e32d/diesel_compile_tests/tests/trybuild.rs#L80-L102) [diesel_compile_tests/tests/fail/expressions_can_only_be_compared_for_equality_to_expressions_of_same_type.rs#L12-L18](https://github.com/diesel-rs/diesel/blob/5cdf54e1434b87084a4630c100249f1028f3e32d/diesel_compile_tests/tests/fail/expressions_can_only_be_compared_for_equality_to_expressions_of_same_type.rs#L12-L18)
- Procedural-macro tests expand tokens, parse the result with syn, apply FixupVisitor, format through prettyplease, and assert insta snapshots; these assertions check generated text rather than database execution. — [diesel_derives/src/tests/mod.rs#L87-L112](https://github.com/diesel-rs/diesel/blob/5cdf54e1434b87084a4630c100249f1028f3e32d/diesel_derives/src/tests/mod.rs#L87-L112)
- CLI tests register database and migration command suites; migration_run_runs_pending_migrations checks command success, emitted migration output, and actual table creation. — [diesel_cli/tests/tests.rs#L3-L17](https://github.com/diesel-rs/diesel/blob/5cdf54e1434b87084a4630c100249f1028f3e32d/diesel_cli/tests/tests.rs#L3-L17) [diesel_cli/tests/migration_run.rs#L7-L32](https://github.com/diesel-rs/diesel/blob/5cdf54e1434b87084a4630c100249f1028f3e32d/diesel_cli/tests/migration_run.rs#L7-L32)
- Schema tests compare CLI/config-generated output with insta snapshots and conditionally compile it in a temporary Cargo project; check_compile=false deliberately skips that compilation assertion for selected cases. — [diesel_cli/tests/print_schema.rs#L717-L749](https://github.com/diesel-rs/diesel/blob/5cdf54e1434b87084a4630c100249f1028f3e32d/diesel_cli/tests/print_schema.rs#L717-L749) [diesel_cli/tests/print_schema.rs#L782-L834](https://github.com/diesel-rs/diesel/blob/5cdf54e1434b87084a4630c100249f1028f3e32d/diesel_cli/tests/print_schema.rs#L782-L834) [diesel_cli/tests/print_schema.rs#L14-L21](https://github.com/diesel-rs/diesel/blob/5cdf54e1434b87084a4630c100249f1028f3e32d/diesel_cli/tests/print_schema.rs#L14-L21)
- CI defines a four-backend, five-platform stable matrix plus Linux beta/nightly entries, invokes cargo xtask run-tests, skips doctests/example-schema checks outside Linux, and uploads coverage outside merge_group events. — [.github/workflows/ci.yml#L32-L72](https://github.com/diesel-rs/diesel/blob/5cdf54e1434b87084a4630c100249f1028f3e32d/.github/workflows/ci.yml#L32-L72) [.github/workflows/ci.yml#L340-L375](https://github.com/diesel-rs/diesel/blob/5cdf54e1434b87084a4630c100249f1028f3e32d/.github/workflows/ci.yml#L340-L375)
- Fuzz CI runs harness tests on PRs/pushes, but cargo-fuzz target execution is workflow_dispatch-only; separate ClusterFuzzLite PR jobs specify address sanitization and 600 seconds, while audit CI runs cargo deny check. — [.github/workflows/fuzz.yml#L25-L47](https://github.com/diesel-rs/diesel/blob/5cdf54e1434b87084a4630c100249f1028f3e32d/.github/workflows/fuzz.yml#L25-L47) [.github/workflows/fuzz.yml#L73-L81](https://github.com/diesel-rs/diesel/blob/5cdf54e1434b87084a4630c100249f1028f3e32d/.github/workflows/fuzz.yml#L73-L81) [.github/workflows/cflite_pr.yml#L13-L31](https://github.com/diesel-rs/diesel/blob/5cdf54e1434b87084a4630c100249f1028f3e32d/.github/workflows/cflite_pr.yml#L13-L31) [.github/workflows/audit.yml#L15-L26](https://github.com/diesel-rs/diesel/blob/5cdf54e1434b87084a4630c100249f1028f3e32d/.github/workflows/audit.yml#L15-L26)

Every claim links to its cited files at the pinned commit. Citations identify source evidence; they do not establish runtime correctness. Independent CodeVetter scan — not reviewed by upstream maintainers.

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