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60 lines
2.1 KiB
Python
60 lines
2.1 KiB
Python
from __future__ import annotations
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from typing import Any
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from unittest import TestCase
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from traitlets import TraitError
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class TraitTestBase(TestCase):
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"""A best testing class for basic trait types."""
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def assign(self, value: Any) -> None:
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self.obj.value = value # type:ignore[attr-defined]
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def coerce(self, value: Any) -> Any:
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return value
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def test_good_values(self) -> None:
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if hasattr(self, "_good_values"):
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for value in self._good_values:
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self.assign(value)
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self.assertEqual(self.obj.value, self.coerce(value)) # type:ignore[attr-defined]
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def test_bad_values(self) -> None:
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if hasattr(self, "_bad_values"):
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for value in self._bad_values:
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try:
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self.assertRaises(TraitError, self.assign, value)
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except AssertionError:
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raise AssertionError(value) from None
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def test_default_value(self) -> None:
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if hasattr(self, "_default_value"):
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self.assertEqual(self._default_value, self.obj.value) # type:ignore[attr-defined]
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def test_allow_none(self) -> None:
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if (
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hasattr(self, "_bad_values")
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and hasattr(self, "_good_values")
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and None in self._bad_values
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):
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trait = self.obj.traits()["value"] # type:ignore[attr-defined]
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try:
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trait.allow_none = True
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self._bad_values.remove(None)
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# skip coerce. Allow None casts None to None.
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self.assign(None)
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self.assertEqual(self.obj.value, None) # type:ignore[attr-defined]
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self.test_good_values()
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self.test_bad_values()
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finally:
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# tear down
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trait.allow_none = False
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self._bad_values.append(None)
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def tearDown(self) -> None:
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# restore default value after tests, if set
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if hasattr(self, "_default_value"):
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self.obj.value = self._default_value # type:ignore[attr-defined]
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