diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 9b57320..f2c8974 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -47,7 +47,7 @@ jobs:
         run: pip install "numpy${{ matrix.numpy-version }}"
 
       - name: Run Tests
-        run: pytest -n auto
+        run: pytest
 
       - name: Coveralls Parallel
         uses: coverallsapp/github-action@v2.3.0
diff --git a/tests/fixtures/paths.py b/tests/fixtures/paths.py
index 2a6b133..cda4623 100644
--- a/tests/fixtures/paths.py
+++ b/tests/fixtures/paths.py
@@ -10,7 +10,7 @@ def tmp_output_dir(request: pytest.FixtureRequest) -> Path:
     path = Path(__file__).parents[1].resolve() / "__tmp__"
     if path.exists():
         shutil.rmtree(str(path))
-    path.mkdir()
+    path.mkdir(parents=True, exist_ok=True)
 
     yield path
 
@@ -26,15 +26,19 @@ def tmp_output_dir(request: pytest.FixtureRequest) -> Path:
 
 
 @pytest.fixture(scope="function")
-def tmp_output_dir_func(tmp_output_dir, request: pytest.FixtureRequest) -> Path:
+def tmp_output_dir_func(
+    tmp_output_dir, testrun_uid, request: pytest.FixtureRequest
+) -> Path:
     """
     tmp output dir that gets cleared between every function
     cleans at the start rather than at cleanup in case the output is to be inspected
     """
     subpath = tmp_output_dir / f"__tmpfunc_{request.node.name}__"
+    if testrun_uid:
+        subpath = subpath / testrun_uid
     if subpath.exists():
         shutil.rmtree(str(subpath))
-    subpath.mkdir()
+    subpath.mkdir(parents=True)
     return subpath
 
 
@@ -47,5 +51,5 @@ def tmp_output_dir_mod(tmp_output_dir, request: pytest.FixtureRequest) -> Path:
     subpath = tmp_output_dir / f"__tmpmod_{request.module}__"
     if subpath.exists():
         shutil.rmtree(str(subpath))
-    subpath.mkdir()
+    subpath.mkdir(parents=True)
     return subpath
diff --git a/tests/test_ndarray.py b/tests/test_ndarray.py
index 18d035b..0f4e7ee 100644
--- a/tests/test_ndarray.py
+++ b/tests/test_ndarray.py
@@ -389,7 +389,7 @@ def test_callable():
     annotation = NDArray[Shape["3"], int]
     array = np.array([1, 2, 3], dtype=int)
     validated = annotation(array)
-    assert validated is array
+    assert np.array_equal(validated, array)
 
     with pytest.raises(DtypeError):
         _ = annotation(np.zeros((1, 2, 3)))
diff --git a/tests/test_testing_helpers.py b/tests/test_testing_helpers.py
index 3f93a41..bfb4d51 100644
--- a/tests/test_testing_helpers.py
+++ b/tests/test_testing_helpers.py
@@ -39,7 +39,7 @@ def test_validation_case_merge():
     "interface",
     [
         pytest.param(
-            i.interface, marks=getattr(pytest.mark, i.interface.interface.name)
+            i.interface, id=i.id, marks=getattr(pytest.mark, i.interface.interface.name)
         )
         for i in INTERFACE_CASES
         if i.id not in ("hdf5_compound")