ballistica/tests/test_efro/test_dataclassutils.py

# Copyright (c) 2011-2020 Eric Froemling
#
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# -----------------------------------------------------------------------------
"""Testing dataclassutils functionality."""

from __future__ import annotations

from dataclasses import dataclass
from typing import TYPE_CHECKING

import pytest

from efro.dataclassutils import dataclass_assign, dataclass_validate

if TYPE_CHECKING:
    from typing import Optional


def test_assign() -> None:
    """Testing various assignments."""

    @dataclass
    class _TestClass:
        ival: int = 0
        sval: str = ''
        bval: bool = True
        fval: float = 1.0
        oival: Optional[int] = None
        osval: Optional[str] = None
        obval: Optional[bool] = None
        ofval: Optional[float] = None

    tclass = _TestClass()

    class _TestClass2:
        pass

    tclass2 = _TestClass2()

    # Arg types:
    with pytest.raises(TypeError):
        dataclass_assign(tclass2, {})

    with pytest.raises(TypeError):
        dataclass_assign(tclass, [])  # type: ignore

    # Invalid attrs.
    with pytest.raises(AttributeError):
        dataclass_assign(tclass, {'nonexistent': 'foo'})

    # Correct types.
    dataclass_assign(tclass, {
        'ival': 1,
        'sval': 'foo',
        'bval': True,
        'fval': 2.0,
    })
    dataclass_assign(tclass, {
        'oival': None,
        'osval': None,
        'obval': None,
        'ofval': None,
    })
    dataclass_assign(tclass, {
        'oival': 1,
        'osval': 'foo',
        'obval': True,
        'ofval': 2.0,
    })

    # Type mismatches.
    with pytest.raises(TypeError):
        dataclass_assign(tclass, {'ival': 'foo'})

    with pytest.raises(TypeError):
        dataclass_assign(tclass, {'sval': 1})

    with pytest.raises(TypeError):
        dataclass_assign(tclass, {'bval': 2})

    with pytest.raises(TypeError):
        dataclass_assign(tclass, {'oival': 'foo'})

    with pytest.raises(TypeError):
        dataclass_assign(tclass, {'osval': 1})

    with pytest.raises(TypeError):
        dataclass_assign(tclass, {'obval': 2})

    with pytest.raises(TypeError):
        dataclass_assign(tclass, {'ofval': 'blah'})

    # More subtle ones (we currently require EXACT type matches)
    with pytest.raises(TypeError):
        dataclass_assign(tclass, {'ival': True})

    with pytest.raises(TypeError):
        dataclass_assign(tclass, {'fval': 2})

    with pytest.raises(TypeError):
        dataclass_assign(tclass, {'bval': 1})

    with pytest.raises(TypeError):
        dataclass_assign(tclass, {'ofval': 1})


def test_validate() -> None:
    """Testing validation."""

    @dataclass
    class _TestClass:
        ival: int = 0
        sval: str = ''
        bval: bool = True
        fval: float = 1.0
        oival: Optional[int] = None
        osval: Optional[str] = None
        obval: Optional[bool] = None
        ofval: Optional[float] = None

    # Should pass by default.
    tclass = _TestClass()
    dataclass_validate(tclass)

    # No longer valid.
    tclass.fval = 1
    with pytest.raises(TypeError):
        dataclass_validate(tclass)

    # Should pass by default.
    tclass = _TestClass()
    dataclass_validate(tclass)

    # No longer valid.
    # noinspection PyTypeHints
    tclass.ival = None  # type: ignore
    with pytest.raises(TypeError):
        dataclass_validate(tclass)