tests(internal[dataclasses]) Add dataclass tests

Author: tony

tests/_internal/test_dataclasses.py

@@ -0,0 +1,42 @@
+"""Test dataclasses utilities."""
+
+from __future__ import annotations
+
+import dataclasses
+
+from libtmux._internal.dataclasses import SkipDefaultFieldsReprMixin
+
+
+@dataclasses.dataclass(repr=False)
+class TestItem(SkipDefaultFieldsReprMixin):
+    """Test class for SkipDefaultFieldsReprMixin."""
+
+    name: str
+    unit_price: float = 1.00
+    quantity_on_hand: int = 0
+
+
+def test_skip_default_fields_repr() -> None:
+    """Test SkipDefaultFieldsReprMixin repr behavior."""
+    # Test with only required field
+    item1 = TestItem("Test")
+    assert repr(item1) == "TestItem(name=Test)"
+
+    # Test with one default field modified
+    item2 = TestItem("Test", unit_price=2.00)
+    assert repr(item2) == "TestItem(name=Test, unit_price=2.0)"
+
+    # Test with all fields modified
+    item3 = TestItem("Test", unit_price=2.00, quantity_on_hand=5)
+    assert repr(item3) == "TestItem(name=Test, unit_price=2.0, quantity_on_hand=5)"
+
+    # Test modifying field after creation
+    item4 = TestItem("Test")
+    item4.unit_price = 2.05
+    assert repr(item4) == "TestItem(name=Test, unit_price=2.05)"
+
+    # Test with multiple fields modified after creation
+    item5 = TestItem("Test")
+    item5.unit_price = 2.05
+    item5.quantity_on_hand = 3
+    assert repr(item5) == "TestItem(name=Test, unit_price=2.05, quantity_on_hand=3)"