Add mypy.stubtest to CI

Author: lagru

.github/workflows/ci.yml

@@ -15,6 +15,7 @@ env:
   # Many color libraries just need this to be set to any value, but at least
   # one distinguishes color depth, where "3" -> "256-bit color".
   FORCE_COLOR: 3
+  MYPYPATH: ${CI_PROJECT_DIR}/stubs
 
 jobs:
   lint:
@@ -69,4 +70,8 @@ jobs:
 
       - name: Generate docstub stubs
         run: |
-          python -m docstub -v src/docstub
+          python -m docstub -v src/docstub -o ${MYPYPATH}/docstub
+
+      - name: Check docstub stubs with mypy
+        run: |
+          python -m mypy.stubtest docstub

pyproject.toml

@@ -45,6 +45,7 @@ dev = [
 test = [
   "pytest >=5.0.0",
   "pytest-cov >= 5.0.0",
+  "mypy",
 ]
 
 [project.urls]
@@ -80,6 +81,7 @@ extend-select = [
   "UP",       # pyupgrade
   "YTT",      # flake8-2020
   "EXE",      # flake8-executable
+#  "PYI",      # flake8-pyi
 ]
 ignore = [
   "PLR09",    # Too many <...>