domain-level constraints

tests/test_constraint_resolver.py

@@ -2,6 +2,7 @@
 
 from physcom.engine.constraint_resolver import ConstraintResolver
 from physcom.models.combination import Combination
+from physcom.models.domain import DomainConstraint
 from physcom.models.entity import Entity, Dependency
 
 
@@ -140,3 +141,22 @@ def test_energy_density_no_constraint_if_no_provider():
     result = resolver.resolve(combo)
     density_violations = [v for v in result.violations if "energy density" in v]
     assert len(density_violations) == 0
+
+
+def test_domain_constraint_blocks_wrong_medium(spaceship, solar_sail, solar_radiation):
+    """Spaceship (space medium) should be blocked in a ground-only domain."""
+    resolver = ConstraintResolver()
+    combo = Combination(entities=[spaceship, solar_sail, solar_radiation])
+    constraints = [DomainConstraint("medium", ["ground", "air"])]
+    result = resolver.check_domain_constraints(combo, constraints)
+    assert result.status == "p1_fail"
+    assert any("medium" in v for v in result.violations)
+
+
+def test_domain_constraint_allows_matching_medium(bicycle, human_pedalling, food_calories):
+    """Bicycle (ground medium) should pass a ground+air domain constraint."""
+    resolver = ConstraintResolver()
+    combo = Combination(entities=[bicycle, human_pedalling, food_calories])
+    constraints = [DomainConstraint("medium", ["ground", "air"])]
+    result = resolver.check_domain_constraints(combo, constraints)
+    assert result.status == "valid"