#[test]
fn test_format_int() {
    // Formatting integers should select the right implementation based off
    // the type of the argument. Also, hex/octal/binary should be defined
    // for integers, but they shouldn't emit the negative sign.
    assert!(format!("{}", 1isize) == "1");
    assert!(format!("{}", 1i8) == "1");
    assert!(format!("{}", 1i16) == "1");
    assert!(format!("{}", 1i32) == "1");
    assert!(format!("{}", 1i64) == "1");
    assert!(format!("{}", -1isize) == "-1");
    assert!(format!("{}", -1i8) == "-1");
    assert!(format!("{}", -1i16) == "-1");
    assert!(format!("{}", -1i32) == "-1");
    assert!(format!("{}", -1i64) == "-1");
    assert!(format!("{:?}", 1isize) == "1");
    assert!(format!("{:?}", 1i8) == "1");
    assert!(format!("{:?}", 1i16) == "1");
    assert!(format!("{:?}", 1i32) == "1");
    assert!(format!("{:?}", 1i64) == "1");
    assert!(format!("{:b}", 1isize) == "1");
    assert!(format!("{:b}", 1i8) == "1");
    assert!(format!("{:b}", 1i16) == "1");
    assert!(format!("{:b}", 1i32) == "1");
    assert!(format!("{:b}", 1i64) == "1");
    assert!(format!("{:x}", 1isize) == "1");
    assert!(format!("{:x}", 1i8) == "1");
    assert!(format!("{:x}", 1i16) == "1");
    assert!(format!("{:x}", 1i32) == "1");
    assert!(format!("{:x}", 1i64) == "1");
    assert!(format!("{:X}", 1isize) == "1");
    assert!(format!("{:X}", 1i8) == "1");
    assert!(format!("{:X}", 1i16) == "1");
    assert!(format!("{:X}", 1i32) == "1");
    assert!(format!("{:X}", 1i64) == "1");
    assert!(format!("{:o}", 1isize) == "1");
    assert!(format!("{:o}", 1i8) == "1");
    assert!(format!("{:o}", 1i16) == "1");
    assert!(format!("{:o}", 1i32) == "1");
    assert!(format!("{:o}", 1i64) == "1");

    assert!(format!("{}", 1usize) == "1");
    assert!(format!("{}", 1u8) == "1");
    assert!(format!("{}", 1u16) == "1");
    assert!(format!("{}", 1u32) == "1");
    assert!(format!("{}", 1u64) == "1");
    assert!(format!("{:?}", 1usize) == "1");
    assert!(format!("{:?}", 1u8) == "1");
    assert!(format!("{:?}", 1u16) == "1");
    assert!(format!("{:?}", 1u32) == "1");
    assert!(format!("{:?}", 1u64) == "1");
    assert!(format!("{:b}", 1usize) == "1");
    assert!(format!("{:b}", 1u8) == "1");
    assert!(format!("{:b}", 1u16) == "1");
    assert!(format!("{:b}", 1u32) == "1");
    assert!(format!("{:b}", 1u64) == "1");
    assert!(format!("{:x}", 1usize) == "1");
    assert!(format!("{:x}", 1u8) == "1");
    assert!(format!("{:x}", 1u16) == "1");
    assert!(format!("{:x}", 1u32) == "1");
    assert!(format!("{:x}", 1u64) == "1");
    assert!(format!("{:X}", 1usize) == "1");
    assert!(format!("{:X}", 1u8) == "1");
    assert!(format!("{:X}", 1u16) == "1");
    assert!(format!("{:X}", 1u32) == "1");
    assert!(format!("{:X}", 1u64) == "1");
    assert!(format!("{:o}", 1usize) == "1");
    assert!(format!("{:o}", 1u8) == "1");
    assert!(format!("{:o}", 1u16) == "1");
    assert!(format!("{:o}", 1u32) == "1");
    assert!(format!("{:o}", 1u64) == "1");

    // Test a larger number
    assert!(format!("{:b}", 55) == "110111");
    assert!(format!("{:o}", 55) == "67");
    assert!(format!("{}", 55) == "55");
    assert!(format!("{:x}", 55) == "37");
    assert!(format!("{:X}", 55) == "37");
}

#[test]
fn test_format_int_zero() {
    assert!(format!("{}", 0) == "0");
    assert!(format!("{:?}", 0) == "0");
    assert!(format!("{:b}", 0) == "0");
    assert!(format!("{:o}", 0) == "0");
    assert!(format!("{:x}", 0) == "0");
    assert!(format!("{:X}", 0) == "0");

    assert!(format!("{}", 0u32) == "0");
    assert!(format!("{:?}", 0u32) == "0");
    assert!(format!("{:b}", 0u32) == "0");
    assert!(format!("{:o}", 0u32) == "0");
    assert!(format!("{:x}", 0u32) == "0");
    assert!(format!("{:X}", 0u32) == "0");
}

#[test]
fn test_format_int_flags() {
    assert!(format!("{:3}", 1) == "  1");
    assert!(format!("{:>3}", 1) == "  1");
    assert!(format!("{:>+3}", 1) == " +1");
    assert!(format!("{:<3}", 1) == "1  ");
    assert!(format!("{:#}", 1) == "1");
    assert!(format!("{:#x}", 10) == "0xa");
    assert!(format!("{:#X}", 10) == "0xA");
    assert!(format!("{:#5x}", 10) == "  0xa");
    assert!(format!("{:#o}", 10) == "0o12");
    assert!(format!("{:08x}", 10) == "0000000a");
    assert!(format!("{:8x}", 10) == "       a");
    assert!(format!("{:<8x}", 10) == "a       ");
    assert!(format!("{:>8x}", 10) == "       a");
    assert!(format!("{:#08x}", 10) == "0x00000a");
    assert!(format!("{:08}", -10) == "-0000010");
    assert!(format!("{:x}", !0u8) == "ff");
    assert!(format!("{:X}", !0u8) == "FF");
    assert!(format!("{:b}", !0u8) == "11111111");
    assert!(format!("{:o}", !0u8) == "377");
    assert!(format!("{:#x}", !0u8) == "0xff");
    assert!(format!("{:#X}", !0u8) == "0xFF");
    assert!(format!("{:#b}", !0u8) == "0b11111111");
    assert!(format!("{:#o}", !0u8) == "0o377");
}

#[test]
fn test_format_int_sign_padding() {
    assert!(format!("{:+5}", 1) == "   +1");
    assert!(format!("{:+5}", -1) == "   -1");
    assert!(format!("{:05}", 1) == "00001");
    assert!(format!("{:05}", -1) == "-0001");
    assert!(format!("{:+05}", 1) == "+0001");
    assert!(format!("{:+05}", -1) == "-0001");
}

#[test]
fn test_format_int_twos_complement() {
    use core::{i8, i16, i32, i64};
    assert!(format!("{}", i8::MIN) == "-128");
    assert!(format!("{}", i16::MIN) == "-32768");
    assert!(format!("{}", i32::MIN) == "-2147483648");
    assert!(format!("{}", i64::MIN) == "-9223372036854775808");
}

#[test]
fn test_format_debug_hex() {
    assert!(format!("{:02x?}", b"Foo\0") == "[46, 6f, 6f, 00]");
    assert!(format!("{:02X?}", b"Foo\0") == "[46, 6F, 6F, 00]");
}