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36dada9 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 | from datetime import date
from TerraFin.analytics.analysis.fundamental.dcf.engine import (
build_linear_growth_rates,
discount_explicit_cash_flows,
)
def test_build_linear_growth_rates_interpolates_horizon() -> None:
growth_rates = build_linear_growth_rates(12.0, 4.0, 5)
assert [round(value, 2) for value in growth_rates] == [12.0, 10.0, 8.0, 6.0, 4.0]
def test_discount_explicit_cash_flows_clamps_terminal_growth_and_anchors_dates() -> None:
result = discount_explicit_cash_flows(
[10.0, 11.0, 12.0],
[10.0, 8.0, 6.0],
[9.0, 9.5, 10.0],
terminal_growth_pct=10.0,
terminal_discount_rate_pct=10.5,
as_of=date(2026, 4, 5),
)
assert result.projected_cash_flows[0].forecast_date == "2027-04-05"
assert result.projected_cash_flows[-1].forecast_date == "2029-04-05"
assert result.terminal_growth_pct == 9.5
assert result.intrinsic_value > sum(row.present_value for row in result.projected_cash_flows)
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