1 files changed, 34 insertions, 0 deletions
diff --git a/src/ablog/tests/test_parallel.py b/src/ablog/tests/test_parallel.py
new file mode 100644
index 0000000..ddb9f6e
--- /dev/null
+++ b/src/ablog/tests/test_parallel.py
@@ -0,0 +1,34 @@
+from pathlib import Path
+from subprocess import run
+import sys
+import pytest
+
+
+@pytest.mark.xfail("win" in sys.platform, reason="Passes on Windows")
+def test_not_safe_for_parallel_read(rootdir: Path, tmp_path: Path):
+    """
+    Ablog is NOT safe for parallel read.
+
+    In such case, it doesn't collect any posts.
+    """
+    # https://github.com/sunpy/ablog/issues/297
+    # Very ugly hack to change the parallel_read_safe value to True
+    good_read_safe = '"parallel_read_safe": False'
+    bad_read_safe = '"parallel_read_safe": True'
+    init_py_path = Path(__file__).parent.parent / "__init__.py"
+    assert good_read_safe in init_py_path.read_text(encoding="utf-8")
+    bad_init_py = init_py_path.read_text().replace(good_read_safe, bad_read_safe)
+    init_py_path.write_text(bad_init_py, encoding="utf-8")
+
+    # liborjelinek: I wasn't able to demonstrate the issue with the `parallel` argument to the `sphinx` fixture
+    # @pytest.mark.sphinx("html", testroot="parallel", parallel=2)
+    # therefore running sphinx-build externally
+    indir = rootdir / "test-parallel"
+    run(["sphinx-build", "-b", "html", indir.as_posix(), tmp_path.as_posix(), "-j", "auto"], check=True)
+
+    # And posts are not collected by Ablog...
+    html = (tmp_path / "postlist.html").read_text(encoding="utf-8")
+    assert "post 1" not in html
+    assert "post 2" not in html
+    assert "post 3" not in html
+    assert "post 4" not in html