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-rw-r--r--library/alloc/tests/fmt.rs323
1 files changed, 323 insertions, 0 deletions
diff --git a/library/alloc/tests/fmt.rs b/library/alloc/tests/fmt.rs
new file mode 100644
index 000000000..5ee6db43f
--- /dev/null
+++ b/library/alloc/tests/fmt.rs
@@ -0,0 +1,323 @@
+#![deny(warnings)]
+
+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\0bar\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!("{A:x}"), "aloha");
+ t!(format!("{B:X}"), "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!("{C:#4}"), "☃123");
+ t!(format!("{D:b}"), "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");
+
+ // 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!("{val:#x}");
+ t!(format!("{:p}", std::ptr::invalid::<isize>(val)), 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();
+ let _ = write!(&mut buf, "{}", 3);
+ {
+ let w = &mut buf;
+ let _ = write!(w, "{foo}", foo = 4);
+ let _ = write!(w, "{}", "hello");
+ let _ = writeln!(w, "{}", "line");
+ let _ = writeln!(w, "{foo}", foo = "bar");
+ let _ = w.write_char('☃');
+ let _ = 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;
+ let _ = write!(w, "{}", format_args!("{}", 1));
+ let _ = write!(w, "{}", format_args!("test"));
+ let _ = 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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