rust/library/core/tests/fmt/mod.rs

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2015-03-07 06:16:44 +01:00
mod builders;
2015-10-15 21:07:20 +02:00
mod float;
mod num;
#[test]
fn test_format_flags() {
// No residual flags left by pointer formatting
let p = "".as_ptr();
assert_eq!(format!("{:p} {:x}", p, 16), format!("{:p} 10", p));
assert_eq!(format!("{: >3}", 'a'), " a");
}
#[test]
fn test_pointer_formats_data_pointer() {
let b: &[u8] = b"";
let s: &str = "";
assert_eq!(format!("{:p}", s), format!("{:p}", s.as_ptr()));
assert_eq!(format!("{:p}", b), format!("{:p}", b.as_ptr()));
}
#[test]
fn test_estimated_capacity() {
assert_eq!(format_args!("").estimated_capacity(), 0);
assert_eq!(format_args!("{}", "").estimated_capacity(), 0);
assert_eq!(format_args!("Hello").estimated_capacity(), 5);
assert_eq!(format_args!("Hello, {}!", "").estimated_capacity(), 16);
assert_eq!(format_args!("{}, hello!", "World").estimated_capacity(), 0);
assert_eq!(format_args!("{}. 16-bytes piece", "World").estimated_capacity(), 32);
}
#[test]
fn pad_integral_resets() {
struct Bar;
impl core::fmt::Display for Bar {
fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
"1".fmt(f)?;
f.pad_integral(true, "", "5")?;
"1".fmt(f)
}
}
assert_eq!(format!("{:<03}", Bar), "1 0051 ");
}