Run the test suite on Windows in CI

.github/workflows/ci-build.yaml

@@ -176,6 +176,48 @@ jobs:
       - name: Dynawo and powsybl tests
         run: pytest tests/dynamic tests/powsybl -v
 
+  windows-pytests:
+    runs-on: windows-latest
+    timeout-minutes: 60
+    defaults:
+      run:
+        shell: bash
+    steps:
+      - uses: actions/checkout@v7
+
+      - name: Install Julia 1.12
+        uses: julia-actions/setup-julia@v3
+        with:
+          version: '1.12'
+
+      - name: Cache Julia depot
+        uses: actions/cache@v6
+        with:
+          path: ~/.julia
+          key: julia-depot-${{ runner.os }}-julia1.12-${{ hashFiles('gridfm_datakit/juliapkg.json') }}
+          restore-keys: |
+            julia-depot-${{ runner.os }}-julia1.12-
+
+      - name: Set up Python 3.12
+        uses: actions/setup-python@v7
+        with:
+          python-version: '3.12'
+          cache: pip
+          cache-dependency-path: pyproject.toml
+
+      - name: Install Python dependencies
+        run: |
+          python -m pip install --upgrade pip wheel
+          pip install -e ".[test]"
+
+      - name: Set up Julia packages (PowerModels)
+        run: python -c "from juliacall import Main as jl; jl.seval('using PowerModels, Ipopt, Memento')"
+
+      - name: Unit tests
+        run: |
+          export SKIP_LARGE_GRIDS=1
+          pytest tests/ -v --durations=25
+
   codeql:
     name: CodeQL (Python)
     runs-on: ubuntu-latest

gridfm_datakit/network.py

@@ -59,6 +59,16 @@
 from gridfm_datakit.utils.idx_gen import GEN_BUS, GEN_STATUS, PG, QG
 
 
+def _julia_string(value: str) -> str:
+    """Return ``value`` as a Julia string literal.
+
+    Backslashes, quotes and ``$`` are escaped, so Windows paths and paths
+    containing interpolation characters reach Julia unchanged.
+    """
+    escaped = value.replace("\\", "\\\\").replace('"', '\\"').replace("$", "\\$")
+    return f'"{escaped}"'
+
+
 def correct_network(network_path: str, force: bool = False) -> str:
     """
     Load a MATPOWER network using PowerModels via run_julia
@@ -101,8 +111,8 @@ def correct_network(network_path: str, force: bool = False) -> str:
         julia_code = [
             "using PowerModels",
             "PowerModels.silence()",
-            f'data = PowerModels.parse_file("{network_path}")',
-            f'PowerModels.export_matpower("{tmp_path}", data)',
+            f"data = PowerModels.parse_file({_julia_string(network_path)})",
+            f"PowerModels.export_matpower({_julia_string(tmp_path)}, data)",
         ]
 
         # Run Julia

gridfm_datakit/process/solver_output.py

@@ -40,7 +40,9 @@
 from typing import Dict, Iterator, Optional
 
 try:
-    _LIBC: Optional[ctypes.CDLL] = ctypes.CDLL(None)
+    _LIBC: Optional[ctypes.CDLL] = ctypes.CDLL(
+        "ucrtbase" if sys.platform == "win32" else None,
+    )
 except Exception:  # pragma: no cover - platform without a loadable libc
     _LIBC = None
 

tests/test_correct_network.py

@@ -0,0 +1,41 @@
+"""
+Test cases for passing network file paths to Julia in correct_network.
+"""
+
+from pathlib import Path
+
+import pytest
+
+from gridfm_datakit.network import (
+    _julia_string,
+    correct_network,
+    get_pglib_source_path,
+)
+
+
+@pytest.mark.parametrize(
+    "value",
+    [
+        "/plain/case14.m",
+        "C:\\Users\\runner\\AppData\\Local\\case14.m",
+        'dir "quoted"/case14.m',
+        "dir/$HOME/case14.m",
+    ],
+)
+def test_julia_string_round_trips(value):
+    from juliacall import Main as jl
+
+    assert jl.seval(_julia_string(value)) == value
+
+
+def test_correct_network_handles_special_characters_in_path(tmp_path):
+    directory = tmp_path / "grid $HOME dir"
+    directory.mkdir()
+    source = directory / "case14_ieee.m"
+    with open(get_pglib_source_path("case14_ieee"), encoding="utf-8") as f:
+        source.write_text(f.read(), encoding="utf-8")
+
+    corrected = correct_network(str(source))
+
+    assert corrected == str(directory / "case14_ieee_corrected.m")
+    assert Path(corrected).stat().st_size > 0

tests/test_solver_output.py

@@ -5,6 +5,7 @@
 
 import ctypes
 import os
+import sys
 
 import pytest
 
@@ -88,7 +89,7 @@ class TestRedirectCStdio:
     # capturing fd-level output that bypasses Python's sys.stdout.
 
     def test_redirects_c_level_writes_to_file(self, tmp_path, capfd):
-        libc = ctypes.CDLL(None)
+        libc = ctypes.CDLL("ucrtbase" if sys.platform == "win32" else None)
         log = tmp_path / "out.log"
 
         with redirect_fds(str(log)):