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test(scan): document current exponent parsing behavior #4647

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test(scan): document current exponent parsing behavior #4647

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30 changes: 30 additions & 0 deletions test/scan-test.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -82,6 +82,36 @@ TEST(scan_test, read_string_view) {
EXPECT_EQ(fmt::scan<fmt::string_view>("foo", "{}")->value(), "foo");
}

TEST(scan_test, read_double_exponent_current_behavior) {
// Exponent (e/E) and leading '+' parsing are not supported yet.
{
fmt::string_view input = "1e3";
double value = 0.0;
auto it = fmt::scan_to(input, "{}", value);
EXPECT_DOUBLE_EQ(value, 1.0);
ASSERT_NE(it, input.end());
EXPECT_EQ(*it, 'e');
}

{
fmt::string_view input = "-2.5e-2";
double value = 0.0;
auto it = fmt::scan_to(input, "{}", value);
EXPECT_DOUBLE_EQ(value, -2.5);
ASSERT_NE(it, input.end());
EXPECT_EQ(*it, 'e');
}

{
fmt::string_view input = "+1E6";
double value = 0.0;
auto it = fmt::scan_to(input, "{}", value);
EXPECT_DOUBLE_EQ(value, 0.0);
ASSERT_NE(it, input.end());
EXPECT_EQ(*it, '+');
}
}

TEST(scan_test, separator) {
int n1 = 0, n2 = 0;
fmt::scan_to("10 20", "{} {}", n1, n2);
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