Fix/address flaky tests (#289)

Author: nathanjmcdougall

tests/functional/test_error_handling.py

@@ -1,14 +1,15 @@
-import os
+from pathlib import Path
 
 import pytest  # type: ignore
 
 from grimp import build_graph, exceptions
 
 
 def test_syntax_error_includes_module():
-    dirname = os.path.dirname(__file__)
-    filename = os.path.abspath(
-        os.path.join(dirname, "..", "assets", "syntaxerrorpackage", "foo", "one.py")
+    filename = str(
+        (
+            Path(__file__).parent.parent / "assets" / "syntaxerrorpackage" / "foo" / "one.py"
+        ).resolve()
     )
 
     with pytest.raises(exceptions.SourceSyntaxError) as excinfo:

tests/unit/conftest.py

@@ -1,14 +1,15 @@
 import pytest  # type: ignore
 
-from grimp.application.config import settings
 from grimp.application.graph import ImportGraph
 from grimp.adaptors.modulefinder import ModuleFinder
+from tests.config import override_settings
 
 
 @pytest.fixture(scope="module", autouse=True)
 def configure_unit_tests():
-    settings.configure(
+    with override_settings(
         IMPORT_GRAPH_CLASS=ImportGraph,
         MODULE_FINDER=ModuleFinder(),
         FILE_SYSTEM=None,
-    )
+    ):
+        yield