test: refactor integration suite and switch mixed fixtures to cffi

[messense]

Summary

• refactor the integration test suite into behavior-oriented modules and shared case-driven helpers
• remove cargo-mock and make mutable cffi mixed fixtures run from isolated per-case package copies
• switch most mixed develop/integration fixtures from pyo3 to cffi, update copied fixture docs, and remove unused pyo3-only mixed fixtures

Testing

• cargo test --test run -- --list
• cargo nextest run

[Copilot]

Pull request overview

This PR restructures the Rust integration test suite into multiple behavior-focused modules, removes the old cargo-mock acceleration mechanism, and updates several “mixed” fixtures to use CFFI (including per-case isolated fixture copies for mutable/generated artifacts).

Changes:

• Split tests/run.rs into multiple modules under tests/run/ (develop, integration, sdist, wheel, pep517, environment, errors).
• Introduced case-driven helpers in tests/common/ for per-case target/wheel directories, environment preparation, and isolated fixture copying (test-crates/case-packages/<case_id>).
• Replaced several pyo3 “mixed” fixtures with equivalent CFFI fixtures; removed test-crates/cargo-mock and updated contributing docs accordingly.

Reviewed changes

Copilot reviewed 85 out of 104 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
tests/run.rs	Turns the test crate into a module dispatcher for the new run suite.
tests/run/develop.rs	Adds parameterized develop tests using DevelopCase.
tests/run/environment.rs	Extracts environment-related regressions (SOURCE_DATE_EPOCH, musl, unreadable dir).
tests/run/errors.rs	Extracts error-path regressions into a dedicated module.
tests/run/integration.rs	Adds parameterized integration tests using IntegrationCase and fixture copy pruning.
tests/run/pep517.rs	Adds PEP517 profile tests via Pep517Case.
tests/run/sdist.rs	Extracts and refactors sdist regressions with case helpers and imperative preserved cases.
tests/run/wheel.rs	Extracts wheel content/path assertions (incl. optional SBOM).
tests/common/mod.rs	Adds shared test helpers: per-case dirs, env prep, fixture copying, prereq install.
tests/common/develop.rs	Refactors develop runner to accept DevelopCase + shared helpers.
tests/common/integration.rs	Refactors integration runner to accept IntegrationCase + shared helpers + isolated fixture copies.
tests/common/pep517.rs	Refactors PEP517 runner to accept Pep517Case + shared env/dir helpers.
tests/common/other.rs	Improves recursive copy skipping artifacts; factors out wheel_files; uses per-case dirs.
.gitignore	Ignores test-crates/case-packages/ created by per-case fixture isolation.
guide/src/contributing.md	Removes cargo-mock instructions; keeps faster-tests guidance.
test-dockerfile.sh	Reduces the set of crates tested in the docker helper script.
test-crates/cargo-mock/src/main.rs	Removes cargo-mock implementation.
test-crates/cargo-mock/Cargo.toml	Removes cargo-mock crate manifest.
test-crates/cargo-mock/Cargo.lock	Removes cargo-mock lockfile.
test-crates/pyo3-mixed-submodule/tox.ini	Removes obsolete pyo3 mixed-submodule fixture test config.
test-crates/pyo3-mixed-submodule/tests/test_pyo3_mixed_submodule.py	Removes obsolete pyo3 mixed-submodule fixture test.
test-crates/pyo3-mixed-submodule/src/lib.rs	Removes obsolete pyo3 mixed-submodule Rust code.
test-crates/pyo3-mixed-submodule/pyo3_mixed_submodule/init.py	Removes obsolete pyo3 mixed-submodule Python package init.
test-crates/pyo3-mixed-submodule/check_installed/check_installed.py	Removes obsolete pyo3 mixed-submodule smoke script.
test-crates/pyo3-mixed-submodule/README.md	Removes obsolete pyo3 mixed-submodule README.
test-crates/pyo3-mixed-submodule/Cargo.toml	Removes obsolete pyo3 mixed-submodule manifest.
test-crates/pyo3-mixed-submodule/Cargo.lock	Removes obsolete pyo3 mixed-submodule lockfile.
test-crates/pyo3-mixed-implicit/tox.ini	Removes obsolete pyo3 mixed-implicit fixture test config.
test-crates/pyo3-mixed-implicit/tests/test_pyo3_mixed_implicit.py	Removes obsolete pyo3 mixed-implicit fixture test.
test-crates/pyo3-mixed-implicit/src/lib.rs	Removes obsolete pyo3 mixed-implicit Rust code.
test-crates/pyo3-mixed-implicit/python/pyo3_mixed_implicit/some_rust/init.py	Removes obsolete pyo3 mixed-implicit Python init.
test-crates/pyo3-mixed-implicit/check_installed/check_installed.py	Removes obsolete pyo3 mixed-implicit smoke script.
test-crates/pyo3-mixed-implicit/README.md	Removes obsolete pyo3 mixed-implicit README.
test-crates/pyo3-mixed-implicit/Cargo.toml	Removes obsolete pyo3 mixed-implicit manifest.
test-crates/pyo3-mixed-implicit/Cargo.lock	Removes obsolete pyo3 mixed-implicit lockfile.
test-crates/pyo3-mixed-with-path-dep/tox.ini	Removes obsolete pyo3 mixed-with-path-dep fixture test config.
test-crates/pyo3-mixed-with-path-dep/tests/test_pyo3_mixed_with_path_dep.py	Removes obsolete pyo3 mixed-with-path-dep fixture test.
test-crates/pyo3-mixed-with-path-dep/src/lib.rs	Removes obsolete pyo3 mixed-with-path-dep Rust code.
test-crates/pyo3-mixed-with-path-dep/pyo3_mixed_with_path_dep/init.py	Removes obsolete pyo3 mixed-with-path-dep Python init.
test-crates/pyo3-mixed-with-path-dep/check_installed/check_installed.py	Removes obsolete pyo3 mixed-with-path-dep smoke script.
test-crates/pyo3-mixed-with-path-dep/README.md	Removes obsolete pyo3 mixed-with-path-dep README.
test-crates/pyo3-mixed-with-path-dep/Cargo.lock	Removes obsolete pyo3 mixed-with-path-dep lockfile.
test-crates/pyo3-mixed-with-path-dep/.gitignore	Removes obsolete pyo3 mixed-with-path-dep ignore file.
test-crates/cffi-mixed-with-path-dep/src/lib.rs	Adds CFFI FFI surface for the “with path dep” fixture.
test-crates/cffi-mixed-with-path-dep/pyproject.toml	Renames project + adds dependencies=["cffi"] and bindings="cffi".
test-crates/cffi-mixed-with-path-dep/check_installed/check_installed.py	Adds CFFI-based install smoke test.
test-crates/cffi-mixed-with-path-dep/cffi_mixed_with_path_dep/init.py	Exposes ffi/lib for the fixture.
test-crates/cffi-mixed-with-path-dep/README.md	Documents new CFFI fixture usage.
test-crates/cffi-mixed-with-path-dep/Cargo.toml	Renames crate/lib from pyo3 to CFFI variant.
test-crates/cffi-mixed-with-path-dep/Cargo.lock	Adds lockfile for the new fixture.
test-crates/cffi-mixed-with-path-dep/.gitignore	Adds ignore rules for Python artifacts.
test-crates/cffi-mixed-submodule/src/lib.rs	Adds CFFI-exported FFI functions/types for submodule fixture.
test-crates/cffi-mixed-submodule/pyproject.toml	Switches to CFFI bindings and updates module name.
test-crates/cffi-mixed-submodule/check_installed/check_installed.py	Adds smoke test importing generated submodule.
test-crates/cffi-mixed-submodule/cffi_mixed_submodule/rust_module/init.py	Adds Python package init for rust submodule.
test-crates/cffi-mixed-submodule/cffi_mixed_submodule/python_module/double.py	Adds small Python helper module.
test-crates/cffi-mixed-submodule/cffi_mixed_submodule/python_module/init.py	Adds (empty) package init.
test-crates/cffi-mixed-submodule/cffi_mixed_submodule/init.py	Exposes rust submodule import.
test-crates/cffi-mixed-submodule/README.md	Documents new CFFI fixture usage.
test-crates/cffi-mixed-submodule/Cargo.toml	Adds new crate manifest for CFFI submodule fixture.
test-crates/cffi-mixed-submodule/Cargo.lock	Adds lockfile for the new fixture.
test-crates/cffi-mixed-submodule/.gitignore	Adds ignore rules (currently appears mismatched).
test-crates/cffi-mixed-src/src/cffi_mixed_src/python_module/double.py	Adds Python helper module for src-layout fixture.
test-crates/cffi-mixed-src/src/cffi_mixed_src/python_module/init.py	Adds (empty) package init.
test-crates/cffi-mixed-src/src/cffi_mixed_src/init.py	Exposes ffi/lib for the src-layout fixture.
test-crates/cffi-mixed-src/rust/src/lib.rs	Adds CFFI FFI surface for src-layout fixture.
test-crates/cffi-mixed-src/rust/Cargo.toml	Adds Rust crate manifest for src-layout fixture.
test-crates/cffi-mixed-src/rust/Cargo.lock	Adds lockfile for src-layout fixture.
test-crates/cffi-mixed-src/pyproject.toml	Adds pyproject for CFFI src-layout fixture.
test-crates/cffi-mixed-src/check_installed/check_installed.py	Adds smoke test for src-layout fixture.
test-crates/cffi-mixed-src/README.md	Documents new CFFI src-layout fixture.
test-crates/cffi-mixed-src/.gitignore	Updates ignores (adds target/).
test-crates/cffi-mixed-py-subdir/src/lib.rs	Adds CFFI FFI surface for python-subdir fixture.
test-crates/cffi-mixed-py-subdir/python/cffi_mixed_py_subdir/python_module/double.py	Adds Python helper module.
test-crates/cffi-mixed-py-subdir/python/cffi_mixed_py_subdir/python_module/init.py	Adds (empty) package init.
test-crates/cffi-mixed-py-subdir/python/cffi_mixed_py_subdir/init.py	Exposes generated module via ffi/lib.
test-crates/cffi-mixed-py-subdir/pyproject.toml	Adds pyproject defining python-source/include/module-name for CFFI.
test-crates/cffi-mixed-py-subdir/check_installed/check_installed.py	Adds smoke test for python-subdir fixture.
test-crates/cffi-mixed-py-subdir/assets/extra_data.txt	Adds included data file for include-pattern regression.
test-crates/cffi-mixed-py-subdir/README.md	Documents new CFFI python-subdir fixture.
test-crates/cffi-mixed-py-subdir/Cargo.toml	Adds Rust crate manifest for python-subdir fixture.
test-crates/cffi-mixed-py-subdir/Cargo.lock	Adds lockfile for python-subdir fixture.
test-crates/cffi-mixed-py-subdir/.gitignore	Adds ignore rules (currently appears mismatched).
test-crates/cffi-mixed-include-exclude/src/lib.rs	Adds CFFI FFI surface for include/exclude regression fixture.
test-crates/cffi-mixed-include-exclude/pyproject.toml	Adds include/exclude rules + out-dir include mapping for regression coverage.
test-crates/cffi-mixed-include-exclude/check_installed/check_installed.py	Adds smoke test verifying out-dir included file content.
test-crates/cffi-mixed-include-exclude/cffi_mixed_include_exclude/python_module/double.py	Adds Python helper module.
test-crates/cffi-mixed-include-exclude/cffi_mixed_include_exclude/python_module/init.py	Adds (empty) package init.
test-crates/cffi-mixed-include-exclude/cffi_mixed_include_exclude/exclude_this_file	Adds excluded file target for exclude rule.
test-crates/cffi-mixed-include-exclude/cffi_mixed_include_exclude/init.py	Exposes generated module via ffi/lib.
test-crates/cffi-mixed-include-exclude/cffi_mixed_include_exclude/.gitignore	Ignores included/generated files within python package.
test-crates/cffi-mixed-include-exclude/build.rs	Generates generated_info.txt into OUT_DIR for include mapping.
test-crates/cffi-mixed-include-exclude/README.md	Documents new include/exclude CFFI fixture.
test-crates/cffi-mixed-include-exclude/Cargo.toml	Adds Rust crate manifest for include/exclude fixture.
test-crates/cffi-mixed-include-exclude/Cargo.lock	Adds lockfile for include/exclude fixture.
test-crates/cffi-mixed-include-exclude/.gitignore	Adds ignore rules (currently appears mismatched).
test-crates/cffi-mixed-implicit/src/lib.rs	Adds CFFI FFI surface for implicit-namespace fixture.
test-crates/cffi-mixed-implicit/python/cffi_mixed_implicit/some_rust/init.py	Exposes generated rust submodule via ffi/lib.
test-crates/cffi-mixed-implicit/pyproject.toml	Switches to CFFI bindings + updates module-name/python-source.
test-crates/cffi-mixed-implicit/check_installed/check_installed.py	Adds smoke test for implicit-namespace fixture.
test-crates/cffi-mixed-implicit/README.md	Documents new implicit-namespace CFFI fixture.
test-crates/cffi-mixed-implicit/Cargo.toml	Adds Rust crate manifest for implicit fixture.
test-crates/cffi-mixed-implicit/Cargo.lock	Adds lockfile for implicit fixture.
test-crates/cffi-mixed-implicit/.gitignore	Adds ignore rules (currently appears mismatched).

[Copilot]

Pull request overview

Copilot reviewed 88 out of 106 changed files in this pull request and generated no new comments.

Comments suppressed due to low confidence (3)

tests/common/integration.rs:1

• The subprocess wrapper sets CARGO_BIN_EXE_cargo-zigbuild to the maturin test binary path (CARGO_BIN_EXE_maturin). That’s very likely incorrect and can cause zig builds to invoke the wrong executable. Set this env var to the actual cargo-zigbuild test binary (e.g., env!(\"CARGO_BIN_EXE_cargo-zigbuild\")) or remove this override if it’s not needed for the subprocess path.
  tests/common/mod.rs:1
• fs::remove_dir_all / fs::remove_file are used here, but fs isn’t imported in the shown module header (only env and str were kept in the diff). This will fail to compile unless std::fs is already imported elsewhere in the file. Fix by adding use std::fs; (or fully-qualifying these calls with std::fs::...).
  tests/run/integration.rs:1
• This test is named integration_pyo3_pure_conda / id integration-pyo3-pure-conda, but it runs the test-crates/pyo3-mixed fixture. This mismatch makes failures hard to interpret. Either switch the fixture path to test-crates/pyo3-pure or rename the test/id to ...pyo3-mixed-conda to match what’s being exercised.