Rename income to flow

Modeling income and expenses separately does not make sense since the
only difference is the sign of the amount. Separate definitions would
lead to a lot of duplicated code.

1 files changed, 18 insertions, 0 deletions

diff --git a/finance/test_flow.py b/finance/test_flow.py
new file mode 100644
index 0000000..aad4e74
--- /dev/null
+++ b/finance/test_flow.py
@@ -0,0 +1,18 @@
+from datetime import datetime
+from decimal import Decimal
+
+from finance import flow
+
+
+def test_income_integration() -> None:
+    inc = flow.Flow(amount=Decimal(3000.0))
+
+    tests = (
+        (datetime(2024, 3, 12), datetime(2024, 4, 2), Decimal(3000.0)),
+        (datetime(2024, 3, 1), datetime(2024, 3, 15), Decimal(3000.0)),
+        (datetime(2024, 2, 25), datetime(2024, 3, 1), Decimal(3000.0)),
+        (datetime(2024, 2, 25), datetime(2024, 6, 12), Decimal(12000.0)),
+    )
+
+    for test in tests:
+        assert inc.integrate(start=test[0], end=test[1]) == test[2]