From 4b2f7329604058f7fd193af64447248d9f79affa Mon Sep 17 00:00:00 2001
From: Dimitri Papadopoulos
 <3234522+DimitriPapadopoulos@users.noreply.github.com>
Date: Thu, 7 Nov 2024 17:12:31 +0100
Subject: [PATCH] Add runtime type checking in CI tests

This should prevent TYPE_CHECKING misuse.

It might also found issues not found by static type checking,
typically by the current MyPy.
---
 .github/workflows/ci.yaml | 5 +++++
 pyproject.toml            | 1 +
 2 files changed, 6 insertions(+)

diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 1a08b4c5903..028e21a342a 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -126,6 +126,10 @@ jobs:
         run: |
           python -m pip install pytest-github-actions-annotate-failures
 
+      - name: Install beartype
+        run: |
+          python -m pip install pytest-beartype
+
       - name: Install xarray
         run: |
           python -m pip install --no-deps -e .
@@ -152,6 +156,7 @@ jobs:
           --cov=xarray
           --cov-report=xml
           --junitxml=pytest.xml
+          --beartype-packages=xarray
 
       - name: Upload test results
         if: always()
diff --git a/pyproject.toml b/pyproject.toml
index b886ee78b6f..3e3a265130b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -41,6 +41,7 @@ dev = [
   "mypy",
   "pre-commit",
   "pytest",
+  "pytest-beartype",
   "pytest-cov",
   "pytest-env",
   "pytest-xdist",