move format! interface tests

This commit is contained in:
Alexis Bourget 2020-09-08 23:29:36 +02:00
parent 85b2d9bf6f
commit 949c96660c
2 changed files with 322 additions and 320 deletions

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@ -1,7 +1,328 @@
use std::fmt;
#![deny(warnings)]
#![allow(unused_must_use)]
use std::cell::RefCell;
use std::fmt::{self, Write};
#[test]
fn test_format() {
let s = fmt::format(format_args!("Hello, {}!", "world"));
assert_eq!(s, "Hello, world!");
}
struct A;
struct B;
struct C;
struct D;
impl fmt::LowerHex for A {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.write_str("aloha")
}
}
impl fmt::UpperHex for B {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.write_str("adios")
}
}
impl fmt::Display for C {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.pad_integral(true, "", "123")
}
}
impl fmt::Binary for D {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.write_str("aa")?;
f.write_char('☃')?;
f.write_str("bb")
}
}
macro_rules! t {
($a:expr, $b:expr) => {
assert_eq!($a, $b)
};
}
#[test]
fn test_format_macro_interface() {
// Various edge cases without formats
t!(format!(""), "");
t!(format!("hello"), "hello");
t!(format!("hello {{"), "hello {");
// default formatters should work
t!(format!("{}", 1.0f32), "1");
t!(format!("{}", 1.0f64), "1");
t!(format!("{}", "a"), "a");
t!(format!("{}", "a".to_string()), "a");
t!(format!("{}", false), "false");
t!(format!("{}", 'a'), "a");
// At least exercise all the formats
t!(format!("{}", true), "true");
t!(format!("{}", '☃'), "");
t!(format!("{}", 10), "10");
t!(format!("{}", 10_usize), "10");
t!(format!("{:?}", '☃'), "'☃'");
t!(format!("{:?}", 10), "10");
t!(format!("{:?}", 10_usize), "10");
t!(format!("{:?}", "true"), "\"true\"");
t!(format!("{:?}", "foo\nbar"), "\"foo\\nbar\"");
t!(
format!("{:?}", "foo\n\"bar\"\r\n\'baz\'\t\\qux\\"),
r#""foo\n\"bar\"\r\n\'baz\'\t\\qux\\""#
);
t!(format!("{:?}", "foo\0bar\x01baz\u{7f}q\u{75}x"), r#""foo\u{0}bar\u{1}baz\u{7f}qux""#);
t!(format!("{:o}", 10_usize), "12");
t!(format!("{:x}", 10_usize), "a");
t!(format!("{:X}", 10_usize), "A");
t!(format!("{}", "foo"), "foo");
t!(format!("{}", "foo".to_string()), "foo");
if cfg!(target_pointer_width = "32") {
t!(format!("{:#p}", 0x1234 as *const isize), "0x00001234");
t!(format!("{:#p}", 0x1234 as *mut isize), "0x00001234");
} else {
t!(format!("{:#p}", 0x1234 as *const isize), "0x0000000000001234");
t!(format!("{:#p}", 0x1234 as *mut isize), "0x0000000000001234");
}
t!(format!("{:p}", 0x1234 as *const isize), "0x1234");
t!(format!("{:p}", 0x1234 as *mut isize), "0x1234");
t!(format!("{:x}", A), "aloha");
t!(format!("{:X}", B), "adios");
t!(format!("foo {} ☃☃☃☃☃☃", "bar"), "foo bar ☃☃☃☃☃☃");
t!(format!("{1} {0}", 0, 1), "1 0");
t!(format!("{foo} {bar}", foo = 0, bar = 1), "0 1");
t!(format!("{foo} {1} {bar} {0}", 0, 1, foo = 2, bar = 3), "2 1 3 0");
t!(format!("{} {0}", "a"), "a a");
t!(format!("{_foo}", _foo = 6usize), "6");
t!(format!("{foo_bar}", foo_bar = 1), "1");
t!(format!("{}", 5 + 5), "10");
t!(format!("{:#4}", C), "☃123");
t!(format!("{:b}", D), "aa☃bb");
let a: &dyn fmt::Debug = &1;
t!(format!("{:?}", a), "1");
// Formatting strings and their arguments
t!(format!("{}", "a"), "a");
t!(format!("{:4}", "a"), "a ");
t!(format!("{:4}", ""), "");
t!(format!("{:>4}", "a"), " a");
t!(format!("{:<4}", "a"), "a ");
t!(format!("{:^5}", "a"), " a ");
t!(format!("{:^5}", "aa"), " aa ");
t!(format!("{:^4}", "a"), " a ");
t!(format!("{:^4}", "aa"), " aa ");
t!(format!("{:.4}", "a"), "a");
t!(format!("{:4.4}", "a"), "a ");
t!(format!("{:4.4}", "aaaaaaaaaaaaaaaaaa"), "aaaa");
t!(format!("{:<4.4}", "aaaaaaaaaaaaaaaaaa"), "aaaa");
t!(format!("{:>4.4}", "aaaaaaaaaaaaaaaaaa"), "aaaa");
t!(format!("{:^4.4}", "aaaaaaaaaaaaaaaaaa"), "aaaa");
t!(format!("{:>10.4}", "aaaaaaaaaaaaaaaaaa"), " aaaa");
t!(format!("{:2.4}", "aaaaa"), "aaaa");
t!(format!("{:2.4}", "aaaa"), "aaaa");
t!(format!("{:2.4}", "aaa"), "aaa");
t!(format!("{:2.4}", "aa"), "aa");
t!(format!("{:2.4}", "a"), "a ");
t!(format!("{:0>2}", "a"), "0a");
t!(format!("{:.*}", 4, "aaaaaaaaaaaaaaaaaa"), "aaaa");
t!(format!("{:.1$}", "aaaaaaaaaaaaaaaaaa", 4), "aaaa");
t!(format!("{:.a$}", "aaaaaaaaaaaaaaaaaa", a = 4), "aaaa");
t!(format!("{:._a$}", "aaaaaaaaaaaaaaaaaa", _a = 4), "aaaa");
t!(format!("{:1$}", "a", 4), "a ");
t!(format!("{1:0$}", 4, "a"), "a ");
t!(format!("{:a$}", "a", a = 4), "a ");
t!(format!("{:-#}", "a"), "a");
t!(format!("{:+#}", "a"), "a");
t!(format!("{:/^10.8}", "1234567890"), "/12345678/");
// Some float stuff
t!(format!("{:}", 1.0f32), "1");
t!(format!("{:}", 1.0f64), "1");
t!(format!("{:.3}", 1.0f64), "1.000");
t!(format!("{:10.3}", 1.0f64), " 1.000");
t!(format!("{:+10.3}", 1.0f64), " +1.000");
t!(format!("{:+10.3}", -1.0f64), " -1.000");
t!(format!("{:e}", 1.2345e6f32), "1.2345e6");
t!(format!("{:e}", 1.2345e6f64), "1.2345e6");
t!(format!("{:E}", 1.2345e6f64), "1.2345E6");
t!(format!("{:.3e}", 1.2345e6f64), "1.234e6");
t!(format!("{:10.3e}", 1.2345e6f64), " 1.234e6");
t!(format!("{:+10.3e}", 1.2345e6f64), " +1.234e6");
t!(format!("{:+10.3e}", -1.2345e6f64), " -1.234e6");
// Float edge cases
t!(format!("{}", -0.0), "0");
t!(format!("{:?}", -0.0), "-0.0");
t!(format!("{:?}", 0.0), "0.0");
// sign aware zero padding
t!(format!("{:<3}", 1), "1 ");
t!(format!("{:>3}", 1), " 1");
t!(format!("{:^3}", 1), " 1 ");
t!(format!("{:03}", 1), "001");
t!(format!("{:<03}", 1), "001");
t!(format!("{:>03}", 1), "001");
t!(format!("{:^03}", 1), "001");
t!(format!("{:+03}", 1), "+01");
t!(format!("{:<+03}", 1), "+01");
t!(format!("{:>+03}", 1), "+01");
t!(format!("{:^+03}", 1), "+01");
t!(format!("{:#05x}", 1), "0x001");
t!(format!("{:<#05x}", 1), "0x001");
t!(format!("{:>#05x}", 1), "0x001");
t!(format!("{:^#05x}", 1), "0x001");
t!(format!("{:05}", 1.2), "001.2");
t!(format!("{:<05}", 1.2), "001.2");
t!(format!("{:>05}", 1.2), "001.2");
t!(format!("{:^05}", 1.2), "001.2");
t!(format!("{:05}", -1.2), "-01.2");
t!(format!("{:<05}", -1.2), "-01.2");
t!(format!("{:>05}", -1.2), "-01.2");
t!(format!("{:^05}", -1.2), "-01.2");
t!(format!("{:+05}", 1.2), "+01.2");
t!(format!("{:<+05}", 1.2), "+01.2");
t!(format!("{:>+05}", 1.2), "+01.2");
t!(format!("{:^+05}", 1.2), "+01.2");
// Ergonomic format_args!
t!(format!("{0:x} {0:X}", 15), "f F");
t!(format!("{0:x} {0:X} {}", 15), "f F 15");
t!(format!("{:x}{0:X}{a:x}{:X}{1:x}{a:X}", 13, 14, a = 15), "dDfEeF");
t!(format!("{a:x} {a:X}", a = 15), "f F");
// And its edge cases
t!(
format!(
"{a:.0$} {b:.0$} {0:.0$}\n{a:.c$} {b:.c$} {c:.c$}",
4,
a = "abcdefg",
b = "hijklmn",
c = 3
),
"abcd hijk 4\nabc hij 3"
);
t!(format!("{a:.*} {0} {:.*}", 4, 3, "efgh", a = "abcdef"), "abcd 4 efg");
t!(format!("{:.a$} {a} {a:#x}", "aaaaaa", a = 2), "aa 2 0x2");
// Test that pointers don't get truncated.
{
let val = usize::MAX;
let exp = format!("{:#x}", val);
t!(format!("{:p}", val as *const isize), exp);
}
// Escaping
t!(format!("{{"), "{");
t!(format!("}}"), "}");
// make sure that format! doesn't move out of local variables
let a = Box::new(3);
format!("{}", a);
format!("{}", a);
// make sure that format! doesn't cause spurious unused-unsafe warnings when
// it's inside of an outer unsafe block
unsafe {
let a: isize = ::std::mem::transmute(3_usize);
format!("{}", a);
}
// test that trailing commas are acceptable
format!("{}", "test",);
format!("{foo}", foo = "test",);
}
// Basic test to make sure that we can invoke the `write!` macro with an
// fmt::Write instance.
#[test]
fn test_write() {
let mut buf = String::new();
write!(&mut buf, "{}", 3);
{
let w = &mut buf;
write!(w, "{foo}", foo = 4);
write!(w, "{}", "hello");
writeln!(w, "{}", "line");
writeln!(w, "{foo}", foo = "bar");
w.write_char('☃');
w.write_str("str");
}
t!(buf, "34helloline\nbar\n☃str");
}
// Just make sure that the macros are defined, there's not really a lot that we
// can do with them just yet (to test the output)
#[test]
fn test_print() {
print!("hi");
print!("{:?}", vec![0u8]);
println!("hello");
println!("this is a {}", "test");
println!("{foo}", foo = "bar");
}
// Just make sure that the macros are defined, there's not really a lot that we
// can do with them just yet (to test the output)
#[test]
fn test_format_args() {
let mut buf = String::new();
{
let w = &mut buf;
write!(w, "{}", format_args!("{}", 1));
write!(w, "{}", format_args!("test"));
write!(w, "{}", format_args!("{test}", test = 3));
}
let s = buf;
t!(s, "1test3");
let s = fmt::format(format_args!("hello {}", "world"));
t!(s, "hello world");
let s = format!("{}: {}", "args were", format_args!("hello {}", "world"));
t!(s, "args were: hello world");
}
#[test]
fn test_order() {
// Make sure format!() arguments are always evaluated in a left-to-right
// ordering
fn foo() -> isize {
static mut FOO: isize = 0;
unsafe {
FOO += 1;
FOO
}
}
assert_eq!(
format!("{} {} {a} {b} {} {c}", foo(), foo(), foo(), a = foo(), b = foo(), c = foo()),
"1 2 4 5 3 6".to_string()
);
}
#[test]
fn test_once() {
// Make sure each argument are evaluated only once even though it may be
// formatted multiple times
fn foo() -> isize {
static mut FOO: isize = 0;
unsafe {
FOO += 1;
FOO
}
}
assert_eq!(format!("{0} {0} {0} {a} {a} {a}", foo(), a = foo()), "1 1 1 2 2 2".to_string());
}
#[test]
fn test_refcell() {
let refcell = RefCell::new(5);
assert_eq!(format!("{:?}", refcell), "RefCell { value: 5 }");
let borrow = refcell.borrow_mut();
assert_eq!(format!("{:?}", refcell), "RefCell { value: <borrowed> }");
drop(borrow);
assert_eq!(format!("{:?}", refcell), "RefCell { value: 5 }");
}

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@ -1,319 +0,0 @@
// run-pass
#![deny(warnings)]
#![allow(unused_must_use)]
#![allow(unused_features)]
#![feature(box_syntax)]
use std::cell::RefCell;
use std::fmt::{self, Write};
use std::usize;
struct A;
struct B;
struct C;
struct D;
impl fmt::LowerHex for A {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
f.write_str("aloha")
}
}
impl fmt::UpperHex for B {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
f.write_str("adios")
}
}
impl fmt::Display for C {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
f.pad_integral(true, "", "123")
}
}
impl fmt::Binary for D {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
f.write_str("aa")?;
f.write_char('☃')?;
f.write_str("bb")
}
}
macro_rules! t {
($a:expr, $b:expr) => { assert_eq!($a, $b) }
}
pub fn main() {
// Various edge cases without formats
t!(format!(""), "");
t!(format!("hello"), "hello");
t!(format!("hello {{"), "hello {");
// default formatters should work
t!(format!("{}", 1.0f32), "1");
t!(format!("{}", 1.0f64), "1");
t!(format!("{}", "a"), "a");
t!(format!("{}", "a".to_string()), "a");
t!(format!("{}", false), "false");
t!(format!("{}", 'a'), "a");
// At least exercise all the formats
t!(format!("{}", true), "true");
t!(format!("{}", '☃'), "");
t!(format!("{}", 10), "10");
t!(format!("{}", 10_usize), "10");
t!(format!("{:?}", '☃'), "'☃'");
t!(format!("{:?}", 10), "10");
t!(format!("{:?}", 10_usize), "10");
t!(format!("{:?}", "true"), "\"true\"");
t!(format!("{:?}", "foo\nbar"), "\"foo\\nbar\"");
t!(format!("{:?}", "foo\n\"bar\"\r\n\'baz\'\t\\qux\\"),
r#""foo\n\"bar\"\r\n\'baz\'\t\\qux\\""#);
t!(format!("{:?}", "foo\0bar\x01baz\u{7f}q\u{75}x"),
r#""foo\u{0}bar\u{1}baz\u{7f}qux""#);
t!(format!("{:o}", 10_usize), "12");
t!(format!("{:x}", 10_usize), "a");
t!(format!("{:X}", 10_usize), "A");
t!(format!("{}", "foo"), "foo");
t!(format!("{}", "foo".to_string()), "foo");
if cfg!(target_pointer_width = "32") {
t!(format!("{:#p}", 0x1234 as *const isize), "0x00001234");
t!(format!("{:#p}", 0x1234 as *mut isize), "0x00001234");
} else {
t!(format!("{:#p}", 0x1234 as *const isize), "0x0000000000001234");
t!(format!("{:#p}", 0x1234 as *mut isize), "0x0000000000001234");
}
t!(format!("{:p}", 0x1234 as *const isize), "0x1234");
t!(format!("{:p}", 0x1234 as *mut isize), "0x1234");
t!(format!("{:x}", A), "aloha");
t!(format!("{:X}", B), "adios");
t!(format!("foo {} ☃☃☃☃☃☃", "bar"), "foo bar ☃☃☃☃☃☃");
t!(format!("{1} {0}", 0, 1), "1 0");
t!(format!("{foo} {bar}", foo=0, bar=1), "0 1");
t!(format!("{foo} {1} {bar} {0}", 0, 1, foo=2, bar=3), "2 1 3 0");
t!(format!("{} {0}", "a"), "a a");
t!(format!("{_foo}", _foo = 6usize), "6");
t!(format!("{foo_bar}", foo_bar=1), "1");
t!(format!("{}", 5 + 5), "10");
t!(format!("{:#4}", C), "☃123");
t!(format!("{:b}", D), "aa☃bb");
let a: &dyn fmt::Debug = &1;
t!(format!("{:?}", a), "1");
// Formatting strings and their arguments
t!(format!("{}", "a"), "a");
t!(format!("{:4}", "a"), "a ");
t!(format!("{:4}", ""), "");
t!(format!("{:>4}", "a"), " a");
t!(format!("{:<4}", "a"), "a ");
t!(format!("{:^5}", "a"), " a ");
t!(format!("{:^5}", "aa"), " aa ");
t!(format!("{:^4}", "a"), " a ");
t!(format!("{:^4}", "aa"), " aa ");
t!(format!("{:.4}", "a"), "a");
t!(format!("{:4.4}", "a"), "a ");
t!(format!("{:4.4}", "aaaaaaaaaaaaaaaaaa"), "aaaa");
t!(format!("{:<4.4}", "aaaaaaaaaaaaaaaaaa"), "aaaa");
t!(format!("{:>4.4}", "aaaaaaaaaaaaaaaaaa"), "aaaa");
t!(format!("{:^4.4}", "aaaaaaaaaaaaaaaaaa"), "aaaa");
t!(format!("{:>10.4}", "aaaaaaaaaaaaaaaaaa"), " aaaa");
t!(format!("{:2.4}", "aaaaa"), "aaaa");
t!(format!("{:2.4}", "aaaa"), "aaaa");
t!(format!("{:2.4}", "aaa"), "aaa");
t!(format!("{:2.4}", "aa"), "aa");
t!(format!("{:2.4}", "a"), "a ");
t!(format!("{:0>2}", "a"), "0a");
t!(format!("{:.*}", 4, "aaaaaaaaaaaaaaaaaa"), "aaaa");
t!(format!("{:.1$}", "aaaaaaaaaaaaaaaaaa", 4), "aaaa");
t!(format!("{:.a$}", "aaaaaaaaaaaaaaaaaa", a=4), "aaaa");
t!(format!("{:._a$}", "aaaaaaaaaaaaaaaaaa", _a=4), "aaaa");
t!(format!("{:1$}", "a", 4), "a ");
t!(format!("{1:0$}", 4, "a"), "a ");
t!(format!("{:a$}", "a", a=4), "a ");
t!(format!("{:-#}", "a"), "a");
t!(format!("{:+#}", "a"), "a");
t!(format!("{:/^10.8}", "1234567890"), "/12345678/");
// Some float stuff
t!(format!("{:}", 1.0f32), "1");
t!(format!("{:}", 1.0f64), "1");
t!(format!("{:.3}", 1.0f64), "1.000");
t!(format!("{:10.3}", 1.0f64), " 1.000");
t!(format!("{:+10.3}", 1.0f64), " +1.000");
t!(format!("{:+10.3}", -1.0f64), " -1.000");
t!(format!("{:e}", 1.2345e6f32), "1.2345e6");
t!(format!("{:e}", 1.2345e6f64), "1.2345e6");
t!(format!("{:E}", 1.2345e6f64), "1.2345E6");
t!(format!("{:.3e}", 1.2345e6f64), "1.234e6");
t!(format!("{:10.3e}", 1.2345e6f64), " 1.234e6");
t!(format!("{:+10.3e}", 1.2345e6f64), " +1.234e6");
t!(format!("{:+10.3e}", -1.2345e6f64), " -1.234e6");
// Float edge cases
t!(format!("{}", -0.0), "0");
t!(format!("{:?}", -0.0), "-0.0");
t!(format!("{:?}", 0.0), "0.0");
// sign aware zero padding
t!(format!("{:<3}", 1), "1 ");
t!(format!("{:>3}", 1), " 1");
t!(format!("{:^3}", 1), " 1 ");
t!(format!("{:03}", 1), "001");
t!(format!("{:<03}", 1), "001");
t!(format!("{:>03}", 1), "001");
t!(format!("{:^03}", 1), "001");
t!(format!("{:+03}", 1), "+01");
t!(format!("{:<+03}", 1), "+01");
t!(format!("{:>+03}", 1), "+01");
t!(format!("{:^+03}", 1), "+01");
t!(format!("{:#05x}", 1), "0x001");
t!(format!("{:<#05x}", 1), "0x001");
t!(format!("{:>#05x}", 1), "0x001");
t!(format!("{:^#05x}", 1), "0x001");
t!(format!("{:05}", 1.2), "001.2");
t!(format!("{:<05}", 1.2), "001.2");
t!(format!("{:>05}", 1.2), "001.2");
t!(format!("{:^05}", 1.2), "001.2");
t!(format!("{:05}", -1.2), "-01.2");
t!(format!("{:<05}", -1.2), "-01.2");
t!(format!("{:>05}", -1.2), "-01.2");
t!(format!("{:^05}", -1.2), "-01.2");
t!(format!("{:+05}", 1.2), "+01.2");
t!(format!("{:<+05}", 1.2), "+01.2");
t!(format!("{:>+05}", 1.2), "+01.2");
t!(format!("{:^+05}", 1.2), "+01.2");
// Ergonomic format_args!
t!(format!("{0:x} {0:X}", 15), "f F");
t!(format!("{0:x} {0:X} {}", 15), "f F 15");
t!(format!("{:x}{0:X}{a:x}{:X}{1:x}{a:X}", 13, 14, a=15), "dDfEeF");
t!(format!("{a:x} {a:X}", a=15), "f F");
// And its edge cases
t!(format!("{a:.0$} {b:.0$} {0:.0$}\n{a:.c$} {b:.c$} {c:.c$}",
4, a="abcdefg", b="hijklmn", c=3),
"abcd hijk 4\nabc hij 3");
t!(format!("{a:.*} {0} {:.*}", 4, 3, "efgh", a="abcdef"), "abcd 4 efg");
t!(format!("{:.a$} {a} {a:#x}", "aaaaaa", a=2), "aa 2 0x2");
// Test that pointers don't get truncated.
{
let val = usize::MAX;
let exp = format!("{:#x}", val);
t!(format!("{:p}", val as *const isize), exp);
}
// Escaping
t!(format!("{{"), "{");
t!(format!("}}"), "}");
test_write();
test_print();
test_order();
test_once();
// make sure that format! doesn't move out of local variables
let a: Box<_> = box 3;
format!("{}", a);
format!("{}", a);
// make sure that format! doesn't cause spurious unused-unsafe warnings when
// it's inside of an outer unsafe block
unsafe {
let a: isize = ::std::mem::transmute(3_usize);
format!("{}", a);
}
test_format_args();
// test that trailing commas are acceptable
format!("{}", "test",);
format!("{foo}", foo="test",);
test_refcell();
}
// Basic test to make sure that we can invoke the `write!` macro with an
// fmt::Write instance.
fn test_write() {
let mut buf = String::new();
write!(&mut buf, "{}", 3);
{
let w = &mut buf;
write!(w, "{foo}", foo=4);
write!(w, "{}", "hello");
writeln!(w, "{}", "line");
writeln!(w, "{foo}", foo="bar");
w.write_char('☃');
w.write_str("str");
}
t!(buf, "34helloline\nbar\n☃str");
}
// Just make sure that the macros are defined, there's not really a lot that we
// can do with them just yet (to test the output)
fn test_print() {
print!("hi");
print!("{:?}", vec![0u8]);
println!("hello");
println!("this is a {}", "test");
println!("{foo}", foo="bar");
}
// Just make sure that the macros are defined, there's not really a lot that we
// can do with them just yet (to test the output)
fn test_format_args() {
let mut buf = String::new();
{
let w = &mut buf;
write!(w, "{}", format_args!("{}", 1));
write!(w, "{}", format_args!("test"));
write!(w, "{}", format_args!("{test}", test=3));
}
let s = buf;
t!(s, "1test3");
let s = fmt::format(format_args!("hello {}", "world"));
t!(s, "hello world");
let s = format!("{}: {}", "args were", format_args!("hello {}", "world"));
t!(s, "args were: hello world");
}
fn test_order() {
// Make sure format!() arguments are always evaluated in a left-to-right
// ordering
fn foo() -> isize {
static mut FOO: isize = 0;
unsafe {
FOO += 1;
FOO
}
}
assert_eq!(format!("{} {} {a} {b} {} {c}",
foo(), foo(), foo(), a=foo(), b=foo(), c=foo()),
"1 2 4 5 3 6".to_string());
}
fn test_once() {
// Make sure each argument are evaluated only once even though it may be
// formatted multiple times
fn foo() -> isize {
static mut FOO: isize = 0;
unsafe {
FOO += 1;
FOO
}
}
assert_eq!(format!("{0} {0} {0} {a} {a} {a}", foo(), a=foo()),
"1 1 1 2 2 2".to_string());
}
fn test_refcell() {
let refcell = RefCell::new(5);
assert_eq!(format!("{:?}", refcell), "RefCell { value: 5 }");
let borrow = refcell.borrow_mut();
assert_eq!(format!("{:?}", refcell), "RefCell { value: <borrowed> }");
drop(borrow);
assert_eq!(format!("{:?}", refcell), "RefCell { value: 5 }");
}