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feefrac: add support for evaluating at given size

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This commit is contained in:
Pieter Wuille
2024-07-29 16:06:30 -04:00
parent 7963aecead
commit ecf956ec9d
3 changed files with 70 additions and 4 deletions
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40
src/test/feefrac_tests.cpp
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@@ -15,7 +15,28 @@ BOOST_AUTO_TEST_CASE(feefrac_operators)
FeeFrac sum{1500, 400};
FeeFrac diff{500, -200};
FeeFrac empty{0, 0};
[[maybe_unused]] FeeFrac zero_fee{0, 1}; // zero-fee allowed
FeeFrac zero_fee{0, 1}; // zero-fee allowed
BOOST_CHECK_EQUAL(zero_fee.EvaluateFee(0), 0);
BOOST_CHECK_EQUAL(zero_fee.EvaluateFee(1), 0);
BOOST_CHECK_EQUAL(zero_fee.EvaluateFee(1000000), 0);
BOOST_CHECK_EQUAL(zero_fee.EvaluateFee(0x7fffffff), 0);
BOOST_CHECK_EQUAL(p1.EvaluateFee(0), 0);
BOOST_CHECK_EQUAL(p1.EvaluateFee(1), 10);
BOOST_CHECK_EQUAL(p1.EvaluateFee(100000000), 1000000000);
BOOST_CHECK_EQUAL(p1.EvaluateFee(0x7fffffff), int64_t(0x7fffffff) * 10);
FeeFrac neg{-1001, 100};
BOOST_CHECK_EQUAL(neg.EvaluateFee(0), 0);
BOOST_CHECK_EQUAL(neg.EvaluateFee(1), -11);
BOOST_CHECK_EQUAL(neg.EvaluateFee(2), -21);
BOOST_CHECK_EQUAL(neg.EvaluateFee(3), -31);
BOOST_CHECK_EQUAL(neg.EvaluateFee(100), -1001);
BOOST_CHECK_EQUAL(neg.EvaluateFee(101), -1012);
BOOST_CHECK_EQUAL(neg.EvaluateFee(100000000), -1001000000);
BOOST_CHECK_EQUAL(neg.EvaluateFee(100000001), -1001000011);
BOOST_CHECK_EQUAL(neg.EvaluateFee(0x7fffffff), -21496311307);
BOOST_CHECK(empty == FeeFrac{}); // same as no-args
@@ -67,6 +88,16 @@ BOOST_AUTO_TEST_CASE(feefrac_operators)
BOOST_CHECK(oversized_1 << oversized_2);
BOOST_CHECK(oversized_1 != oversized_2);
BOOST_CHECK_EQUAL(oversized_1.EvaluateFee(0), 0);
BOOST_CHECK_EQUAL(oversized_1.EvaluateFee(1), 1152921);
BOOST_CHECK_EQUAL(oversized_1.EvaluateFee(2), 2305843);
BOOST_CHECK_EQUAL(oversized_1.EvaluateFee(1548031267), 1784758530396540);
// Test cases on the threshold where FeeFrac::EvaluateFee start using Mul/Div.
BOOST_CHECK_EQUAL(FeeFrac(0x1ffffffff, 123456789).EvaluateFee(98765432), 6871947728);
BOOST_CHECK_EQUAL(FeeFrac(0x200000000, 123456789).EvaluateFee(98765432), 6871947729);
BOOST_CHECK_EQUAL(FeeFrac(0x200000001, 123456789).EvaluateFee(98765432), 6871947730);
// Tests paths that use double arithmetic
FeeFrac busted{(static_cast<int64_t>(INT32_MAX)) + 1, INT32_MAX};
BOOST_CHECK(!(busted < busted));
@@ -77,6 +108,13 @@ BOOST_AUTO_TEST_CASE(feefrac_operators)
BOOST_CHECK(max_fee <= max_fee);
BOOST_CHECK(max_fee >= max_fee);
BOOST_CHECK_EQUAL(max_fee.EvaluateFee(0), 0);
BOOST_CHECK_EQUAL(max_fee.EvaluateFee(1), 977888);
BOOST_CHECK_EQUAL(max_fee.EvaluateFee(2), 1955777);
BOOST_CHECK_EQUAL(max_fee.EvaluateFee(3), 2933666);
BOOST_CHECK_EQUAL(max_fee.EvaluateFee(1256796054), 1229006664189047);
BOOST_CHECK_EQUAL(max_fee.EvaluateFee(INT32_MAX), 2100000000000000);
FeeFrac max_fee2{1, 1};
BOOST_CHECK(max_fee >= max_fee2);