Add Reports domain method to get portfolio spend

tests/domain/test_reports.py

@@ -1,8 +1,31 @@
-# TODO: Implement when we get real reporting data
-def test_expired_task_orders():
-    pass
+import pytest
+
+from atst.domain.reports import Reports
+from tests.factories import PortfolioFactory
+from decimal import Decimal
 
 
-# TODO: Implement when we get real reporting data
-def test_obligated_funds_by_JEDI_clin():
-    pass
+@pytest.fixture(scope="function")
+def portfolio():
+    portfolio = PortfolioFactory.create()
+    return portfolio
+
+
+class TestGetPortfolioSpending:
+    csp_data = {
+        "tenant_id": "",
+        "billing_profile_properties": {
+            "invoice_sections": [{"invoice_section_id": "",}]
+        },
+    }
+
+    def test_with_csp_data(self, portfolio):
+        portfolio.csp_data = self.csp_data
+        data = Reports.get_portfolio_spending(portfolio)
+        assert data["invoiced"] == Decimal(1551.0)
+        assert data["estimated"] == Decimal(500.0)
+
+    def test_without_csp_data(self, portfolio):
+        data = Reports.get_portfolio_spending(portfolio)
+        assert data["invoiced"] == Decimal(0)
+        assert data["estimated"] == Decimal(0)