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tests fullPaymentInterest

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Vito
2025-12-02 16:02:54 +01:00
parent d075f261ba
commit 9bd25dbb6e
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83
src/test/app/LendingHelpers_test.cpp
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@@ -538,10 +538,93 @@ class LendingHelpers_test : public beast::unit_test::suite
}
}
// This test overlaps with testLoanAccruedInterest, the test cases only
// exercise the computeFullPaymentInterest parts unique to it.
void
testComputeFullPaymentInterest()
{
using namespace jtx;
using namespace ripple::detail;
struct TestCase
{
std::string name;
Number rawPrincipalOutstanding;
Number periodicRate;
NetClock::time_point parentCloseTime;
std::uint32_t paymentInterval;
std::uint32_t prevPaymentDate;
std::uint32_t startDate;
TenthBips32 closeInterestRate;
Number expectedFullPaymentInterest;
};
auto const testCases = std::vector<TestCase>{
{
.name = "Zero principal outstanding",
.rawPrincipalOutstanding = Number{0},
.periodicRate = Number{5, -2},
.parentCloseTime =
NetClock::time_point{NetClock::duration{3'000}},
.paymentInterval = 30 * 24 * 60 * 60,
.prevPaymentDate = 2'000,
.startDate = 1'000,
.closeInterestRate = TenthBips32{10'000},
.expectedFullPaymentInterest = Number{0},
},
{
.name = "Zero close interest rate",
.rawPrincipalOutstanding = Number{1'000},
.periodicRate = Number{5, -2},
.parentCloseTime =
NetClock::time_point{NetClock::duration{3'000}},
.paymentInterval = 30 * 24 * 60 * 60,
.prevPaymentDate = 2'000,
.startDate = 1'000,
.closeInterestRate = TenthBips32{0},
.expectedFullPaymentInterest =
Number{1929012345679012, -17}, // from calc
},
{
.name = "Standard case",
.rawPrincipalOutstanding = Number{1'000},
.periodicRate = Number{5, -2},
.parentCloseTime =
NetClock::time_point{NetClock::duration{3'000}},
.paymentInterval = 30 * 24 * 60 * 60,
.prevPaymentDate = 2'000,
.startDate = 1'000,
.closeInterestRate = TenthBips32{10'000},
.expectedFullPaymentInterest =
Number{1000192901234568, -13}, // from calc
},
};
for (auto const& tc : testCases)
{
testcase("computeFullPaymentInterest: " + tc.name);
auto const computedFullPaymentInterest = computeFullPaymentInterest(
tc.rawPrincipalOutstanding,
tc.periodicRate,
tc.parentCloseTime,
tc.paymentInterval,
tc.prevPaymentDate,
tc.startDate,
tc.closeInterestRate);
BEAST_EXPECTS(
computedFullPaymentInterest == tc.expectedFullPaymentInterest,
"Full payment interest mismatch: expected " +
to_string(tc.expectedFullPaymentInterest) + ", got " +
to_string(computedFullPaymentInterest));
}
}
public:
void
run() override
{
testComputeFullPaymentInterest();
testLoanAccruedInterest();
testLoanLatePaymentInterest();
testLoanPeriodicPayment();