From fb70c42d2f7a722825c18797fb6a390807a2a4b7 Mon Sep 17 00:00:00 2001
From: Henry Schreiner <henryfs@princeton.edu>
Date: Tue, 3 Mar 2026 16:07:23 -0500
Subject: [PATCH 1/2] chore: add check-sdist to checks

Signed-off-by: Henry Schreiner <henryfs@princeton.edu>
---
 .pre-commit-config.yaml | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 5c9b9103..707d9ebd 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -34,5 +34,13 @@ repos:
   - id: rst-directive-colons
   - id: rst-inline-touching-normal
 
+- repo: https://github.com/henryiii/check-sdist
+  rev: v1.4.0
+  hooks:
+  - id: check-sdist
+    args: [--inject-junk]
+    additional_dependencies:
+    - flit-core
+
 ci:
   autoupdate_schedule: quarterly

From f69b51c51fbc238328ea5981a68cab030fc9d13d Mon Sep 17 00:00:00 2001
From: Henry Schreiner <henryfs@princeton.edu>
Date: Tue, 3 Mar 2026 16:10:55 -0500
Subject: [PATCH 2/2] chore: drop test_sdist

Signed-off-by: Henry Schreiner <henryfs@princeton.edu>
---
 .github/workflows/test.yml |  3 ---
 pyproject.toml             |  4 ---
 tests/test_sdist.py        | 51 --------------------------------------
 3 files changed, 58 deletions(-)
 delete mode 100644 tests/test_sdist.py

diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index bf1fbf0b..61357e29 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -38,9 +38,6 @@ jobs:
         cache-dependency-path: pyproject.toml
     - name: Install the project and its test dependencies
       run: pip install --group test coverage[toml] .
-    - name: Include SDist check dependencies
-      if: matrix.python-version == '3.13'
-      run: pip install build flit
     - name: Test with pytest
       run: coverage run -m pytest -v
       env:
diff --git a/pyproject.toml b/pyproject.toml
index 9b7ec873..69bb518b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -135,7 +135,3 @@ depends = []
 deps = ["pre-commit"]
 package = "skip"
 commands = [["pre-commit", "run", "-a"]]
-
-[tool.tox.env.pkg]
-deps = ["build", "flit >= 3.8"]
-commands = [["pytest", "tests/test_sdist.py", { replace = "posargs", extend = true }]]
diff --git a/tests/test_sdist.py b/tests/test_sdist.py
deleted file mode 100644
index 0d5f6b65..00000000
--- a/tests/test_sdist.py
+++ /dev/null
@@ -1,51 +0,0 @@
-import subprocess
-import sys
-import tarfile
-from pathlib import Path
-
-import pytest
-from pytest import MonkeyPatch
-
-pytest.importorskip("flit")
-pytest.importorskip("build")
-
-# This test must be run from the source directory - okay to skip if not
-DIR = Path(__file__).parent.resolve()
-MAIN_DIR = DIR.parent
-
-
-def test_compare_sdists(monkeypatch: MonkeyPatch, tmp_path: Path) -> None:
-    monkeypatch.chdir(MAIN_DIR)
-
-    sdist_build_dir = tmp_path / "bdir"
-
-    subprocess.run(
-        [
-            sys.executable,
-            "-m",
-            "build",
-            "--sdist",
-            "--no-isolation",
-            f"--outdir={sdist_build_dir}",
-        ],
-        check=True,
-    )
-
-    (sdist_build,) = sdist_build_dir.glob("*.tar.gz")
-
-    # Flit doesn't allow targeting directories, as far as I can tell
-    process = subprocess.run(
-        [sys.executable, "-m", "flit", "build", "--format=sdist"],
-        stderr=subprocess.PIPE,
-    )
-    if process.returncode != 0:
-        pytest.fail(process.stderr.decode("utf-8"))
-
-    (sdist_flit,) = Path("dist").glob("*.tar.gz")
-
-    out = [set(), set()]
-    for i, sdist in enumerate([sdist_build, sdist_flit]):
-        with tarfile.open(sdist, "r:gz") as tar:
-            out[i] = set(tar.getnames())
-
-    assert out[0] == (out[1] - {"setup.py"})