8000 Implement basic constraints unit tests. by jhance · Pull Request #13210 · python/mypy · GitHub
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Implement basic constraints unit tests. #13210

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Merged
merged 2 commits into from
Jul 21, 2022
Merged

Implement basic constraints unit tests. #13210

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9bb1fda
Implement basic constraints unit tests.
jhance Jul 20, 2022
980e8a1
Update mypy/test/testconstraints.py
JukkaL Jul 21, 2022
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Implement basic constraints unit tests.
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@jhance
jhance committed Jul 20, 2022
commit 9bb1fda267aa09a697e4b4a8ae2d28b1fb994292
8 changes: 8 additions & 0 deletions mypy/constraints.py
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Original file line number Diff line number Diff line change
Expand Up @@ -54,6 +54,14 @@ def __repr__(self) -> str:
op_str = ':>'
return f'{self.type_var} {op_str} {self.target}'

def __hash__(self) -> int:
return hash((self.type_var, self.op, self.target))

def __eq__(self, other: object) -> bool:
if not isinstance(other, Constraint):
return False
return (self.type_var, self.op, self.target) == (other.type_var, other.op, other.target)


def infer_constraints_for_callable(
callee: CallableType,
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21 changes: 21 additions & 0 deletions mypy/test/testconstraints.py
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@@ -0,0 +1,21 @@
from mypy.test.helpers import Suite
from mypy.test.typefixture import TypeFixture
from mypy.constraints import infer_constraints, SUBTYPE_OF, SUPERTYPE_OF, Constraint

class ConstraintsSuite(Suite):
def setUp(self) -> None:
self.fx = TypeFixture()

def test_no_type_variables(self) -> None:
assert not infer_constraints(self.fx.o, self.fx.o, SUBTYPE_OF)

def test_basic_type_variable(self) -> None:
fx = self.fx
for direction in [SUBTYPE_OF, SUPERTYPE_OF]:
assert infer_constraints(fx.gt, fx.ga, direction) == [
Constraint(
type_var=fx.t.id,
op=direction,
target=fx.a,
)
]
0