Fix macos network tests (#618)

* add download example to docs

* expand doc-string

* add page to index

* add bbox as param

* use mags list

* Update docs/src/webknossos-py/examples/download_image_data.md

Co-authored-by: Jonathan Striebel <[email protected]>

* Update docs/src/webknossos-py/examples/download_image_data.md

Co-authored-by: Jonathan Striebel <[email protected]>

* Update docs/src/webknossos-py/index.md

Co-authored-by: Jonathan Striebel <[email protected]>

* Update webknossos/webknossos/dataset/dataset.py

Co-authored-by: Jonathan Striebel <[email protected]>

* add test to test_examples

* add assertion

* add allowed_hosts

* Update downsampling_utils.py

* reset downsampling-utils

* reformat

* add changelog entry

* add comment

Co-authored-by: Jonathan Striebel <[email protected]>

Author: leowe

webknossos/Changelog.md

@@ -22,6 +22,7 @@ For upgrade instructions, please check the respective *Breaking Changes* section
 - Inconsistent writes to datasets properties (e.g., caused due to multiprocessing) are detected automatically. The warning can be escalated to an exception with `warnings.filterwarnings("error", module="webknossos", message=r"\[WARNING\]")`. [#633](https://github.com/scalableminds/webknossos-libs/pull/633)
 
 ### Fixed
+- Tests: The `./test.sh` script works on macOS again and doesn't throw Network Errors anymore. However the introduced fix could lead to slightly different behaviour on macOS tests vs CI tests, when UNIX socket communication is involved. [#618](https://github.com/scalableminds/webknossos-libs/pull/618)
 
 
 ## [0.9.9](https://github.com/scalableminds/webknossos-libs/releases/tag/v0.9.9) - 2022-03-03

webknossos/tests/conftest.py

@@ -1,4 +1,5 @@
 import json
+import multiprocessing
 import re
 import warnings
 from io import BytesIO
@@ -316,3 +317,12 @@ def pytest_collection_modifyitems(items: List[pytest.Item]) -> None:
     for item in items:
         if item.get_closest_marker("vcr") is None:
             item.add_marker("vcr")
+
+        if (
+            item.get_closest_marker("block_network") is None
+            and multiprocessing.get_start_method() != "fork"
+        ):
+            # To allow for UNIX socket communication necessary for spawn multiprocessing
+            # addresses starting with `/` are allowed
+            marker = pytest.mark.block_network(allowed_hosts=["/.*"])
+            item.add_marker(marker)