Add test for ECPS mortgage interest

Author: nikhilwoodruff

policyengine_us_data/tests/test_datasets/test_enhanced_cps.py

@@ -27,3 +27,12 @@ def test_policyengine_cps_loads(year: int):
     sim = Microsimulation(dataset=dataset)
 
     assert not sim.calculate("household_net_income").isna().any()
+
+def test_ecps_has_mortgage_interest():
+    from policyengine_us_data.datasets.cps import EnhancedCPS_2024
+    from policyengine_us import Microsimulation
+
+    sim = Microsimulation(dataset=EnhancedCPS_2024)
+
+    assert sim.calculate("deductible_mortgage_interest").sum() > 1
+    assert sim.calculate("interest_expense").sum() > 1