Add first test suite and make sure renpy is not needed to run it.

tests/conftest.py

@@ -0,0 +1,21 @@
+import builtins
+from unittest.mock import MagicMock, patch
+
+import pytest
+
+
+@pytest.fixture(autouse=True)
+def mock_renpy(monkeypatch):
+    """This trick overrides for time of testing need to have renpy in the sys.path.
+
+    Rationale is that we want to test NQTR library and and renpy usually is installed
+    globally somewhere else in the OS.
+    """
+    import_orig = builtins.__import__
+
+    def mocked_import(name, *args, **kwargs):
+        if name in ("renpy.exports", "renpy.character", "renpy"):
+            return MagicMock()
+        return import_orig(name, *args, **kwargs)
+
+    monkeypatch.setattr(builtins, "__import__", mocked_import)

tests/test_nqtr_button.py

@@ -0,0 +1,67 @@
+import pytest
+
+
+def test_button():
+    """Base tests, to prove that default button  state is one we expect"""
+    from pythonpackages.nqtr.button import Button
+
+    some_button = Button()
+
+    assert some_button.align == (0, 0)
+    assert some_button.name == ""
+    assert some_button.label_name is None
+    assert some_button.button_icon is None
+    assert some_button.button_icon_selected is None
+    assert some_button.picture_in_background is None
+    assert some_button.picture_in_background_selected is None
+    assert some_button.xalign == 0
+    assert some_button.yalign == 0
+    assert some_button.hidden is False
+    assert some_button.default_label_name is None
+
+
+def test_align_not_working_as_expected():
+    """Previously this test was showcasing problem with align"""
+    from pythonpackages.nqtr.button import Button
+
+    some_button = Button()
+
+    assert type(some_button.align) is tuple
+    assert some_button.align == (0, 0)
+
+    some_button.xalign = 0
+
+    assert type(some_button.align) is tuple
+    assert some_button.align == (0, 0)
+
+
+@pytest.mark.parametrize(
+    "xalign,yalign,xexpected,yexpected",
+    [
+        (0, 0, 0, 0),
+        (1, 1, 1, 1),
+        (-1, -1, -1, -1),
+        (1.1, 1.2, 1.1, 1.2),
+        (-1.1, -1.2, -1.1, -1.2),
+        ("", "", 0, 0),
+        (False, False, 0, 0),
+        (None, None, 0, 0),
+        ({}, {}, 0, 0),
+        ("0", "0", "0", "0"),
+    ],
+)
+def test_button_aligns_accept_any_param_except_none(
+    xalign, yalign, xexpected, yexpected
+):
+    """Check if various xalign, yalign attributes are properly saved to the class, all
+    Falsey values should be converted to 0 (special caveat for "0", it's not False-y,
+    but some may thing it is)
+    """
+    from pythonpackages.nqtr.button import Button
+
+    some_button = Button(xalign=xalign, yalign=yalign)
+
+    assert some_button.xalign == xexpected
+    assert some_button.yalign == yexpected
+    assert type(some_button.xalign) is type(xexpected)
+    assert type(some_button.yalign) is type(yexpected)