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Test get_round_direction

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This commit is contained in:
Victor Zverovich
2019-03-10 11:14:50 -07:00
parent 8129b9bc46
commit 1632f72cbe
2 changed files with 49 additions and 20 deletions
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23
test/format-impl-test.cc
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@@ -98,6 +98,29 @@ TEST(FPTest, GetCachedPower) {
}
}
TEST(FPTest, GetRoundDirection) {
using fmt::internal::get_round_direction;
EXPECT_EQ(fmt::internal::down, get_round_direction(100, 50, 0));
EXPECT_EQ(fmt::internal::up, get_round_direction(100, 51, 0));
EXPECT_EQ(fmt::internal::down, get_round_direction(100, 40, 10));
EXPECT_EQ(fmt::internal::up, get_round_direction(100, 60, 10));
for (int i = 41; i < 60; ++i)
EXPECT_EQ(fmt::internal::unknown, get_round_direction(100, i, 10));
uint64_t max = std::numeric_limits<uint64_t>::max();
EXPECT_THROW(get_round_direction(100, 100, 0), assertion_failure);
EXPECT_THROW(get_round_direction(100, 0, 100), assertion_failure);
EXPECT_THROW(get_round_direction(100, 0, 50), assertion_failure);
// Check that remainder + error doesn't overflow.
EXPECT_EQ(fmt::internal::up, get_round_direction(max, max - 1, 2));
// Check that 2 * (remainder + error) doesn't overflow.
EXPECT_EQ(fmt::internal::unknown,
get_round_direction(max, max / 2 + 1, max / 2));
// Check that remainder - error doesn't overflow.
EXPECT_EQ(fmt::internal::unknown, get_round_direction(100, 40, 41));
// Check that 2 * (remainder - error) doesn't overflow.
EXPECT_EQ(fmt::internal::up, get_round_direction(max, max - 1, 1));
}
TEST(FPTest, Grisu2FormatCompilesWithNonIEEEDouble) {
fmt::memory_buffer buf;
int exp = 0;