fix: rewrite tests

tests/test_changelog.py

@@ -1,5 +1,17 @@
-def test_headings():
-    with open("CHANGELOG.md", "r") as f:
+import pytest
+
+from importlib import resources
+from dzgui.const.constants import APP_NAME_LOWER, CHANGELOG_PATH
+
+
+@pytest.fixture
+def changelog():
+    path = resources.files(APP_NAME_LOWER).joinpath(CHANGELOG_PATH)
+    return path
+
+
+def test_headings(changelog):
+    with open(changelog, "r") as f:
         lines = f.readlines()
     for line in lines:
         if line.startswith("#"):