Unit tests (#297)

* added unit tests #1

* moar tests

* add more tests

* fixes after PR review

Author: rozyczko

pyproject.toml

@@ -39,6 +39,11 @@ dependencies = [
 ]
 
 [project.optional-dependencies]
+test = [
+    'pytest',
+    'pytest-cov',
+]
+
 ci = [
   'pyinstaller',
   'licensename',

tests/__init__.py

@@ -0,0 +1 @@
+# Test package for EasyReflectometryApp backend unit tests.

tests/conftest.py

@@ -0,0 +1,11 @@
+import pytest
+from PySide6.QtCore import QCoreApplication
+
+
+@pytest.fixture(scope='session')
+def qcore_application():
+    app = QCoreApplication.instance()
+    if app is None:
+        app = QCoreApplication([])
+    yield app
+    app.quit()