diff --git a/packages/essnmx/tests/conftest.py b/packages/essnmx/tests/conftest.py
index 8710000b..521ff6fd 100644
--- a/packages/essnmx/tests/conftest.py
+++ b/packages/essnmx/tests/conftest.py
@@ -2,3 +2,101 @@
 # Copyright (c) 2024 Scipp contributors (https://github.com/scipp)
 # These fixtures cannot be found by pytest,
 # if they are not defined in `conftest.py` under `tests` directory.
+# flake8: noqa: E501
+
+import pytest
+
+
+@pytest.fixture
+def no_detectors() -> str:
+    return """
+SPLIT 999 COMPONENT Xtal = Single_crystal(
+                order = 1,
+                p_transmit=0.001,
+        reflections = "Rubredoxin.lau",
+        xwidth = XtalSize_width,
+                yheight = XtalSize_height,
+                zdepth = XtalSize_depth,
+                mosaic = XtalMosaicity,
+                delta_d_d=1e-4)
+   AT (0, 0, deltaz) RELATIVE PREVIOUS
+   ROTATED (XtalPhiX,XtalPhiY, XtalPhiZ) RELATIVE armSample
+ EXTEND %{
+        if (!SCATTERED) {ABSORB;}
+  %}
+
+COMPONENT Sphere = PSD_monitor_4PI(
+    nx = 360, ny = 360, filename = "4pi", radius = 0.2,
+    restore_neutron = 1)
+
+AT (0, 0, deltaz) RELATIVE armSample
+"""
+
+
+@pytest.fixture
+def two_detectors_two_filenames() -> str:
+    return """
+COMPONENT nD_Mantid_0 = Monitor_nD(
+        options ="mantid square x limits=[0 0.512] bins=1280 y limits=[0 0.512] bins=1280, neutron pixel min=1 t, list all neutrons",
+    xmin = 0,
+    xmax = 0.512,
+    ymin = 0,
+    ymax = 0.512,
+    restore_neutron = 1,
+    filename = "bank01_events.dat")
+        AT (-0.25, -0.25, 0.29) RELATIVE armSample
+        ROTATED (0, 0, 0) RELATIVE armSample
+
+COMPONENT nD_Mantid_1 = Monitor_nD(
+        options ="mantid square x limits=[0 0.512] bins=1280 y limits=[0 0.512] bins=1280, neutron pixel min=2000000 t, list all neutrons",
+    xmin = 0,
+    xmax = 0.512,
+    ymin = 0,
+    ymax = 0.512,
+    restore_neutron = 1,
+    filename = "bank02_events.dat")
+  AT (-0.29, -0.25, 0.25) RELATIVE armSample
+  ROTATED (0, 90, 0) RELATIVE armSample
+"""
+
+
+@pytest.fixture
+def one_detector_no_filename() -> str:
+    return """
+COMPONENT nD_Mantid_2 = Monitor_nD(
+        options ="mantid square x limits=[0 0.512] bins=1280 y limits=[0 0.512] bins=1280, neutron pixel min=2000000 t, list all neutrons",
+    xmin = 0,
+    xmax = 0.512,
+    ymin = 0,
+    ymax = 0.512,
+    restore_neutron = 1,
+  AT (-0.29, -0.25, 0.25) RELATIVE armSample
+  ROTATED (0, 90, 0) RELATIVE armSample
+"""
+
+
+@pytest.fixture
+def two_detectors_same_filename() -> str:
+    return """
+COMPONENT nD_Mantid_0 = Monitor_nD(
+        options ="mantid square x limits=[0 0.512] bins=1280 y limits=[0 0.512] bins=1280, neutron pixel min=1 t, list all neutrons",
+    xmin = 0,
+    xmax = 0.512,
+    ymin = 0,
+    ymax = 0.512,
+    restore_neutron = 1,
+    filename = "bank01_events.dat")
+        AT (-0.25, -0.25, 0.29) RELATIVE armSample
+        ROTATED (0, 0, 0) RELATIVE armSample
+
+COMPONENT nD_Mantid_1 = Monitor_nD(
+        options ="mantid square x limits=[0 0.512] bins=1280 y limits=[0 0.512] bins=1280, neutron pixel min=2000000 t, list all neutrons",
+    xmin = 0,
+    xmax = 0.512,
+    ymin = 0,
+    ymax = 0.512,
+    restore_neutron = 1,
+    filename = "bank01_events.dat")
+  AT (-0.29, -0.25, 0.25) RELATIVE armSample
+  ROTATED (0, 90, 0) RELATIVE armSample
+"""
diff --git a/packages/essnmx/tests/mcstas/loader_test.py b/packages/essnmx/tests/mcstas/loader_test.py
index c9d090d3..1f526241 100644
--- a/packages/essnmx/tests/mcstas/loader_test.py
+++ b/packages/essnmx/tests/mcstas/loader_test.py
@@ -1,7 +1,6 @@
 # SPDX-License-Identifier: BSD-3-Clause
 # Copyright (c) 2024 Scipp contributors (https://github.com/scipp)
 import pathlib
-import sys
 from collections.abc import Generator
 
 import pytest
@@ -19,14 +18,6 @@
     NMXRawEventCountsDataGroup,
 )
 
-sys.path.insert(0, str(pathlib.Path(__file__).resolve().parent))
-from mcstas_description_examples import (
-    no_detectors,
-    one_detector_no_filename,
-    two_detectors_same_filename,
-    two_detectors_two_filenames,
-)
-
 
 def check_nmxdata_properties(
     dg: NMXRawEventCountsDataGroup, fast_axis, slow_axis
@@ -133,24 +124,24 @@ def test_missing_rotation(rotation_mission_tmp_file: FilePath) -> None:
         # McStasInstrument is not used due to error in the file.
 
 
-def test_bank_names_to_detector_names_two_detectors():
+def test_bank_names_to_detector_names_two_detectors(two_detectors_two_filenames):
     res = bank_names_to_detector_names(two_detectors_two_filenames)
     assert len(res) == 2
     assert all(len(v) == 1 for v in res.values())
 
 
-def test_bank_names_to_detector_names_same_filename():
+def test_bank_names_to_detector_names_same_filename(two_detectors_same_filename):
     res = bank_names_to_detector_names(two_detectors_same_filename)
     assert len(res) == 1
     assert all(len(v) == 2 for v in res.values())
 
 
-def test_bank_names_to_detector_names_no_detectors():
+def test_bank_names_to_detector_names_no_detectors(no_detectors):
     res = bank_names_to_detector_names(no_detectors)
     assert len(res) == 0
 
 
-def test_bank_names_to_detector_names_no_filename():
+def test_bank_names_to_detector_names_no_filename(one_detector_no_filename):
     res = bank_names_to_detector_names(one_detector_no_filename)
     assert len(res) == 1
     ((bank, (detector,)),) = res.items()
diff --git a/packages/essnmx/tests/mcstas/mcstas_description_examples.py b/packages/essnmx/tests/mcstas/mcstas_description_examples.py
deleted file mode 100644
index 40315ead..00000000
--- a/packages/essnmx/tests/mcstas/mcstas_description_examples.py
+++ /dev/null
@@ -1,84 +0,0 @@
-# flake8: noqa: E501
-
-no_detectors = """
-SPLIT 999 COMPONENT Xtal = Single_crystal(
-                order = 1,
-                p_transmit=0.001,
-        reflections = "Rubredoxin.lau",
-        xwidth = XtalSize_width,
-                yheight = XtalSize_height,
-                zdepth = XtalSize_depth,
-                mosaic = XtalMosaicity,
-                delta_d_d=1e-4)
-   AT (0, 0, deltaz) RELATIVE PREVIOUS
-   ROTATED (XtalPhiX,XtalPhiY, XtalPhiZ) RELATIVE armSample
- EXTEND %{
-        if (!SCATTERED) {ABSORB;}
-  %}
-
-COMPONENT Sphere = PSD_monitor_4PI(
-    nx = 360, ny = 360, filename = "4pi", radius = 0.2,
-    restore_neutron = 1)
-
-AT (0, 0, deltaz) RELATIVE armSample
-"""
-
-two_detectors_two_filenames = """
-COMPONENT nD_Mantid_0 = Monitor_nD(
-        options ="mantid square x limits=[0 0.512] bins=1280 y limits=[0 0.512] bins=1280, neutron pixel min=1 t, list all neutrons",
-    xmin = 0,
-    xmax = 0.512,
-    ymin = 0,
-    ymax = 0.512,
-    restore_neutron = 1,
-    filename = "bank01_events.dat")
-        AT (-0.25, -0.25, 0.29) RELATIVE armSample
-        ROTATED (0, 0, 0) RELATIVE armSample
-
-COMPONENT nD_Mantid_1 = Monitor_nD(
-        options ="mantid square x limits=[0 0.512] bins=1280 y limits=[0 0.512] bins=1280, neutron pixel min=2000000 t, list all neutrons",
-    xmin = 0,
-    xmax = 0.512,
-    ymin = 0,
-    ymax = 0.512,
-    restore_neutron = 1,
-    filename = "bank02_events.dat")
-  AT (-0.29, -0.25, 0.25) RELATIVE armSample
-  ROTATED (0, 90, 0) RELATIVE armSample
-"""
-
-one_detector_no_filename = """
-COMPONENT nD_Mantid_2 = Monitor_nD(
-        options ="mantid square x limits=[0 0.512] bins=1280 y limits=[0 0.512] bins=1280, neutron pixel min=2000000 t, list all neutrons",
-    xmin = 0,
-    xmax = 0.512,
-    ymin = 0,
-    ymax = 0.512,
-    restore_neutron = 1,
-  AT (-0.29, -0.25, 0.25) RELATIVE armSample
-  ROTATED (0, 90, 0) RELATIVE armSample
-"""
-
-two_detectors_same_filename = """
-COMPONENT nD_Mantid_0 = Monitor_nD(
-        options ="mantid square x limits=[0 0.512] bins=1280 y limits=[0 0.512] bins=1280, neutron pixel min=1 t, list all neutrons",
-    xmin = 0,
-    xmax = 0.512,
-    ymin = 0,
-    ymax = 0.512,
-    restore_neutron = 1,
-    filename = "bank01_events.dat")
-        AT (-0.25, -0.25, 0.29) RELATIVE armSample
-        ROTATED (0, 0, 0) RELATIVE armSample
-
-COMPONENT nD_Mantid_1 = Monitor_nD(
-        options ="mantid square x limits=[0 0.512] bins=1280 y limits=[0 0.512] bins=1280, neutron pixel min=2000000 t, list all neutrons",
-    xmin = 0,
-    xmax = 0.512,
-    ymin = 0,
-    ymax = 0.512,
-    restore_neutron = 1,
-    filename = "bank01_events.dat")
-  AT (-0.29, -0.25, 0.25) RELATIVE armSample
-  ROTATED (0, 90, 0) RELATIVE armSample
-"""