Add comprehensive edge case and integration tests for salary cap

New test classes:
- TestEdgeCases: Negative values, large numbers, precision boundaries
- TestRealTeamModel: Tests with actual api_calls.team.Team model

Added 9 new tests (30 total):
- Negative salary cap handling
- Negative WAR values
- Very large/small cap values
- Float precision boundary (exactly at tolerance)
- Real Pydantic Team model integration

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

tests/test_salary_cap.py

@@ -252,6 +252,154 @@ class TestPydanticModelSupport:
         assert result is False
 
 
+class TestEdgeCases:
+    """Tests for edge cases and boundary conditions."""
+
+    def test_negative_salary_cap(self):
+        """
+        Negative salary cap should be returned as-is (even if nonsensical).
+
+        Why: Function should not validate business logic - just return the value.
+        If someone sets a negative cap, that's a data issue, not a helper issue.
+        """
+        team = {'abbrev': 'BROKE', 'salary_cap': -5.0}
+        result = get_team_salary_cap(team)
+        assert result == -5.0
+
+    def test_negative_wara_under_cap(self):
+        """
+        Negative WAR should not exceed any positive cap.
+
+        Why: Teams with negative WAR (all bad players) are clearly under cap.
+        """
+        team = {'abbrev': 'TEST', 'salary_cap': 32.0}
+        result = exceeds_salary_cap(-10.0, team)
+        assert result is False
+
+    def test_negative_wara_with_negative_cap(self):
+        """
+        Negative WAR vs negative cap - WAR higher than cap exceeds it.
+
+        Why: Edge case where both values are negative. -3.0 > -5.0 + 0.001
+        """
+        team = {'abbrev': 'BROKE', 'salary_cap': -5.0}
+        # -3.0 > -4.999 (which is -5.0 + 0.001), so it exceeds
+        result = exceeds_salary_cap(-3.0, team)
+        assert result is True
+
+        # -6.0 < -4.999, so it does not exceed
+        result = exceeds_salary_cap(-6.0, team)
+        assert result is False
+
+    def test_very_large_salary_cap(self):
+        """
+        Very large salary cap values should work correctly.
+
+        Why: Ensure no overflow or precision issues with large numbers.
+        """
+        team = {'abbrev': 'RICH', 'salary_cap': 1000000.0}
+        result = get_team_salary_cap(team)
+        assert result == 1000000.0
+
+        result = exceeds_salary_cap(999999.0, team)
+        assert result is False
+
+        result = exceeds_salary_cap(1000001.0, team)
+        assert result is True
+
+    def test_very_small_salary_cap(self):
+        """
+        Very small (but positive) salary cap should work.
+
+        Why: Some hypothetical penalty scenario with tiny cap.
+        """
+        team = {'abbrev': 'TINY', 'salary_cap': 0.5}
+        result = exceeds_salary_cap(0.4, team)
+        assert result is False
+
+        result = exceeds_salary_cap(0.6, team)
+        assert result is True
+
+    def test_float_precision_boundary(self):
+        """
+        Test exact boundary of tolerance (cap + 0.001).
+
+        Why: Ensure the boundary condition is handled correctly.
+        The check is wara > (cap + tolerance), so exactly at boundary should NOT exceed.
+        """
+        team = {'abbrev': 'TEST', 'salary_cap': 32.0}
+        # Exactly at cap + tolerance = 32.001
+        result = exceeds_salary_cap(32.001, team)
+        assert result is False  # Not greater than, equal to
+
+        # Just barely over
+        result = exceeds_salary_cap(32.0011, team)
+        assert result is True
+
+
+class TestRealTeamModel:
+    """Tests using the actual Team Pydantic model from api_calls."""
+
+    def test_with_real_team_model(self):
+        """
+        Test with the actual Team Pydantic model used in production.
+
+        Why: Ensures the helper works with real Team objects, not just mocks.
+        """
+        from api_calls.team import Team
+
+        team = Team(
+            id=1,
+            abbrev='TEST',
+            sname='Test Team',
+            lname='Test Team Long Name',
+            season=12,
+            salary_cap=28.5
+        )
+        result = get_team_salary_cap(team)
+        assert result == 28.5
+
+    def test_with_real_team_model_none_cap(self):
+        """
+        Real Team model with salary_cap=None should use default.
+
+        Why: This is the most common case in production.
+        """
+        from api_calls.team import Team
+
+        team = Team(
+            id=2,
+            abbrev='STD',
+            sname='Standard Team',
+            lname='Standard Team Long Name',
+            season=12,
+            salary_cap=None
+        )
+        result = get_team_salary_cap(team)
+        assert result == DEFAULT_SALARY_CAP
+
+    def test_exceeds_with_real_team_model(self):
+        """
+        exceeds_salary_cap with real Team model.
+
+        Why: End-to-end test with actual production model.
+        """
+        from api_calls.team import Team
+
+        team = Team(
+            id=3,
+            abbrev='EXP',
+            sname='Expansion',
+            lname='Expansion Team',
+            season=12,
+            salary_cap=28.0
+        )
+        # 30.0 exceeds 28.0 cap
+        assert exceeds_salary_cap(30.0, team) is True
+        # 27.0 does not exceed 28.0 cap
+        assert exceeds_salary_cap(27.0, team) is False
+
+
 class TestConstants:
     """Tests for salary cap constants."""