Update _get_application_import_names to have fall-backs

ni_python_styleguide/_cli.py

@@ -39,14 +39,23 @@ def _read_pyproject_toml(ctx, param, value):
 
 def _get_application_import_names(pyproject):
     """Returns the application package name the config."""
-    # Otherwise override with what was specified
+    # Use the tool-specific import names if specified
     app_name = (
         pyproject.get("tool", {})
         .get("ni-python-styleguide", {})
         .get("application-import-names", "")
     )
 
-    # Allow the poetry name as a fallback
+    # Next fall back to project.import-names
+    if not app_name:
+        import_names = pyproject.get("project", {}).get("import-names", [])
+        app_name = ",".join(import_names)
+
+    # Next fall back to project.name (replace hyphens)
+    if not app_name:
+        app_name = pyproject.get("project", {}).get("name", "").replace("-", "_")
+
+    # Next fall back to tool.poetry.name (replace hyphens)
     if not app_name:
         app_name = pyproject.get("tool", {}).get("poetry", {}).get("name", "").replace("-", "_")
 

tests/test_cli/test_application_import_names.py

@@ -0,0 +1,44 @@
+"""Tests for the "_get_application_import_names" method of _cli.py."""
+
+import pytest
+
+from ni_python_styleguide._cli import _get_application_import_names
+
+
+@pytest.mark.parametrize(
+    "pyproject_obj, expected_names",
+    [
+        (
+            {
+                "tool": {
+                    "ni-python-styleguide": {"application-import-names": "ain1,ain2"},
+                    "poetry": {"name": "tool.poetry.name"},
+                },
+                "project": {
+                    "import-names": ["import-names1", "import-names2"],
+                    "name": "project.name",
+                },
+            },
+            "ain1,ain2,tests",
+        ),
+        (
+            {
+                "tool": {"poetry": {"name": "tool.poetry.name"}},
+                "project": {
+                    "import-names": ["import-names1", "import-names2"],
+                    "name": "project.name",
+                },
+            },
+            "import-names1,import-names2,tests",
+        ),
+        (
+            {"tool": {"poetry": {"name": "tool.poetry.name"}}, "project": {"name": "project.name"}},
+            "project.name,tests",
+        ),
+        ({"tool": {"poetry": {"name": "tool.poetry.name"}}}, "tool.poetry.name,tests"),
+    ],
+)
+def test_get_application_import_names_returns_valid_data(pyproject_obj, expected_names):
+    """Tests that _get_application_import_names returns valid data."""
+    result = _get_application_import_names(pyproject_obj)
+    assert result == expected_names