Initial vendor packages

Signed-off-by: Valentin Popov <valentin@popov.link>

vendor/encode_unicode/tests/errs.rs

@@ -0,0 +1,197 @@
+/* Copyright 2016 The encode_unicode Developers
+ *
+ * Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or
+ * http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or
+ * http://opensource.org/licenses/MIT>, at your option. This file may not be
+ * copied, modified, or distributed except according to those terms.
+ */
+
+//! Test that methods gives the correct error.
+//! Some also test a bit more because it's easy.
+
+extern crate core;
+use core::char;
+extern crate encode_unicode;
+use encode_unicode::*;
+use encode_unicode::error::*;
+use encode_unicode::error::InvalidUtf8Array as a;
+use encode_unicode::error::InvalidUtf8Slice as s;
+use encode_unicode::error::InvalidCodepoint::*;
+use encode_unicode::error::InvalidUtf8::*;
+use encode_unicode::error::InvalidUtf8FirstByte::*;
+
+
+#[test]
+fn from_u32() {
+    for c in 0xd800..0xe000 {
+        assert_eq!(char::from_u32_detailed(c),  Err(Utf16Reserved));
+    }
+    let mut c = 0x11_00_00;
+    loop {
+        assert_eq!(char::from_u32_detailed(c),  Err(TooHigh));
+        // Don't test every value. (Range.step_by() is unstable)
+        match c.checked_add(0x10_11_11) {
+            Some(next) => c = next,
+            None => break,
+        }
+    }
+}
+
+#[test]
+fn utf8_extra_bytes() {
+    for c in 0..256 {
+        assert_eq!( (c as u8).extra_utf8_bytes(), match c {
+            0b_1000_0000...0b_1011_1111 => Err(ContinuationByte),
+            0b_1111_1000...0b_1111_1111 => Err(TooLongSeqence),
+            0b_0000_0000...0b_0111_1111 => Ok(0),
+            0b_1100_0000...0b_1101_1111 => Ok(1),
+            0b_1110_0000...0b_1110_1111 => Ok(2),
+            0b_1111_0000...0b_1111_0111 => Ok(3),
+                         _              => unreachable!(),
+        });
+    }
+}
+
+#[test]
+fn utf16_extra_unit() {
+    for c in 0..0x1_00_00 {
+        assert_eq!( (c as u16).utf16_needs_extra_unit(), match c {
+            0b_0000_0000_0000_0000...0b_1101_0111_1111_1111 => Ok(false),
+            0b_1101_1000_0000_0000...0b_1101_1011_1111_1111 => Ok(true),
+            0b_1101_1100_0000_0000...0b_1101_1111_1111_1111 => Err(InvalidUtf16FirstUnit),
+            0b_1110_0000_0000_0000...0b_1111_1111_1111_1111 => Ok(false),
+                                   _                        => unreachable!(),
+        });
+    }
+}
+
+
+#[test]
+fn from_utf16_tuple() {
+    use encode_unicode::error::InvalidUtf16Tuple::*;
+    for u in 0xdc00..0xe000 {
+        let close = if u%3==0 {u-100} else {u+100};
+        let doesnt_matter = if u%2==0 {Some(close)} else {None};
+        assert_eq!(char::from_utf16_tuple((u,doesnt_matter)), Err(FirstIsTrailingSurrogate));
+    }
+    for u in (0..0xd800).chain(0xe000..0x10000) {
+        assert_eq!(
+            char::from_utf16_tuple((u as u16, Some((0x100+u) as u16))),
+            Err(SuperfluousSecond)
+        );
+    }
+    for u in 0xd800..0xdc00 {
+        assert_eq!(char::from_utf16_tuple((u,None)), Err(MissingSecond));
+        assert_eq!(char::from_utf16_tuple((u,Some(u - 0x2ff))), Err(InvalidSecond));
+    }
+}
+
+#[test]
+fn from_utf16_slice_start() {
+    use encode_unicode::error::InvalidUtf16Slice::*;
+    assert_eq!(char::from_utf16_slice_start(&[]), Err(EmptySlice));
+    let mut buf = [0; 6];
+    for u in 0xd800..0xdc00 {
+        buf[0] = u;
+        assert_eq!(char::from_utf16_slice_start(&buf[..1]), Err(MissingSecond));
+        buf[1] = u;
+        let pass = 2 + (u as usize % (buf.len()-2));
+        assert_eq!(char::from_utf16_slice_start(&buf[..pass]), Err(SecondNotLowSurrogate));
+    }
+    for u in 0xdc00..0xe000 {
+        buf[0] = u;
+        let close = if u%3==0 {u-100} else {u+100};
+        let pass = 1 + (u as usize % (buf.len()-1));
+        buf[pass] = close;
+        assert_eq!(char::from_utf16_slice_start(&buf[..pass]), Err(FirstLowSurrogate));
+    }
+}
+
+#[test]
+fn utf8_overlong() {
+    let overlongs = [
+        [0xf0,0x8f], [0xf0,0x87], [0xf0,0x80], // 4-byte
+        [0xe0,0x9f], [0xe0,0x8f], [0xe0,0x80], // 3-byte
+        [0xc1,0xbf], [0xc1,0x92], [0xc1,0x80], // 2-byte
+        [0xc0,0xbf], [0xc0,0x9f], [0xc0,0x80], // 2-byte
+    ];
+    for o in overlongs.iter() {
+        for &last in &[0x80, 0xbf] {
+            let arr = [o[0], o[1], last, last];
+            assert_eq!(char::from_utf8_slice_start(&arr), Err(InvalidUtf8Slice::Utf8(OverLong)));
+            assert_eq!(char::from_utf8_array(arr), Err(InvalidUtf8Array::Utf8(OverLong)));
+            assert_eq!(Utf8Char::from_slice_start(&arr), Err(InvalidUtf8Slice::Utf8(OverLong)));
+            assert_eq!(Utf8Char::from_array(arr), Err(InvalidUtf8Array::Utf8(OverLong)));
+        }
+    }
+}
+
+#[test]
+fn from_str_start() {
+    assert_eq!(Utf8Char::from_str_start(""), Err(EmptyStrError));
+    assert_eq!(Utf16Char::from_str_start(""), Err(EmptyStrError));
+}
+
+#[test] fn utf8_codepoint_is_too_high() {
+    assert_eq!(Utf8Char::from_array([0xf4, 0x90, 0x80, 0x80]), Err(a::Codepoint(TooHigh)));
+    assert_eq!(char::from_utf8_array([0xf4, 0x90, 0x80, 0x80]), Err(a::Codepoint(TooHigh)));
+    assert_eq!(Utf8Char::from_slice_start(&[0xf4, 0x90, 0x80, 0x80]), Err(s::Codepoint(TooHigh)));
+    assert_eq!(char::from_utf8_slice_start(&[0xf4, 0x90, 0x80, 0x80]), Err(s::Codepoint(TooHigh)));
+
+    assert_eq!(Utf8Char::from_array([0xf5, 0x88, 0x99, 0xaa]), Err(a::Codepoint(TooHigh)));
+    assert_eq!(char::from_utf8_array([0xf5, 0xaa, 0xbb, 0x88]), Err(a::Codepoint(TooHigh)));
+    assert_eq!(Utf8Char::from_slice_start(&[0xf5, 0x99, 0xaa, 0xbb]), Err(s::Codepoint(TooHigh)));
+    assert_eq!(char::from_utf8_slice_start(&[0xf5, 0xbb, 0x88, 0x99]), Err(s::Codepoint(TooHigh)));
+}
+
+#[test] fn utf8_codepoint_is_utf16_reserved() {
+    assert_eq!(Utf8Char::from_array([0xed, 0xa0, 0x80, 0xff]), Err(a::Codepoint(Utf16Reserved)));
+    assert_eq!(char::from_utf8_array([0xed, 0xa0, 0x8f, 0x00]), Err(a::Codepoint(Utf16Reserved)));
+    assert_eq!(Utf8Char::from_slice_start(&[0xed, 0xa0, 0xbe, 0xa5]), Err(s::Codepoint(Utf16Reserved)));
+    assert_eq!(char::from_utf8_slice_start(&[0xed, 0xa0, 0xbf]), Err(s::Codepoint(Utf16Reserved)));
+    assert_eq!(Utf8Char::from_array([0xed, 0xbf, 0x80, 0xff]), Err(a::Codepoint(Utf16Reserved)));
+    assert_eq!(char::from_utf8_array([0xed, 0xbf, 0x8f, 0x00]), Err(a::Codepoint(Utf16Reserved)));
+    assert_eq!(Utf8Char::from_slice_start(&[0xed, 0xbf, 0xbe, 0xa5]), Err(s::Codepoint(Utf16Reserved)));
+    assert_eq!(char::from_utf8_slice_start(&[0xed, 0xbf, 0xbf]), Err(s::Codepoint(Utf16Reserved)));
+}
+
+#[test] fn utf8_first_is_continuation_byte() {
+    for first in 0x80..0xc0 {
+        let arr = [first, first<<2, first<<4, first<<6];
+        assert_eq!(Utf8Char::from_array(arr), Err(a::Utf8(FirstByte(ContinuationByte))));
+        assert_eq!(char::from_utf8_array(arr), Err(a::Utf8(FirstByte(ContinuationByte))));
+        let len = (1 + first%3) as usize;
+        assert_eq!(Utf8Char::from_slice_start(&arr[..len]), Err(s::Utf8(FirstByte(ContinuationByte))));
+        assert_eq!(char::from_utf8_slice_start(&arr[..len]), Err(s::Utf8(FirstByte(ContinuationByte))));
+    }
+}
+
+#[test] fn utf8_too_long() {
+    for first in 0xf8..0x100 {
+        let arr = [first as u8, 0x88, 0x80, 0x80];
+        assert_eq!(Utf8Char::from_array(arr), Err(a::Utf8(FirstByte(TooLongSeqence))));
+        assert_eq!(char::from_utf8_array(arr), Err(a::Utf8(FirstByte(TooLongSeqence))));
+        let arr = [first as u8, 0x88, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80];
+        let slice = &arr[..if first&1 == 0 {1} else {8}];
+        assert_eq!(Utf8Char::from_slice_start(slice), Err(s::Utf8(FirstByte(TooLongSeqence))));
+        assert_eq!(char::from_utf8_slice_start(slice), Err(s::Utf8(FirstByte(TooLongSeqence))));
+    }
+}
+
+#[test] fn utf8_not_continuation_byte() {
+    for first in 0xc2..0xf4 {
+        let mut arr = [first, 0x90, 0xa0, 0xb0];
+        let extra = first.extra_utf8_bytes().unwrap();
+        for corrupt in (1..extra).rev() {
+            let expected = NotAContinuationByte(corrupt);
+            for &bad in &[0x00, 0x3f,  0x40, 0x7f,  0xc0, 0xff] {
+                arr[corrupt] = bad;
+                assert_eq!(Utf8Char::from_array(arr), Err(a::Utf8(expected)), "{:?}", arr);
+                assert_eq!(char::from_utf8_array(arr), Err(a::Utf8(expected)));
+                let slice = if first&1 == 0 {&arr[..1+extra]} else {&arr};
+                assert_eq!(Utf8Char::from_slice_start(slice), Err(s::Utf8(expected)), "{:?}", slice);
+                assert_eq!(char::from_utf8_slice_start(slice), Err(s::Utf8(expected)));
+            }
+        }
+    }
+}

vendor/encode_unicode/tests/exhaustive.rs

@@ -0,0 +1,34 @@
+/* Copyright 2018 The encode_unicode Developers
+ *
+ * Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or
+ * http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or
+ * http://opensource.org/licenses/MIT>, at your option. This file may not be
+ * copied, modified, or distributed except according to those terms.
+ */
+
+//! Tests that try all possible values for at least one parameter / byte / unit
+//! of the tested function.
+
+use std::char;
+extern crate encode_unicode;
+use encode_unicode::*;
+
+#[test]
+fn from_ascii() {
+    for cp in 0u32..256 {
+        assert_eq!(Utf8Char::from_ascii(cp as u8).is_ok(), cp & 0x80 == 0);
+        if let Ok(u8c) = Utf8Char::from_ascii(cp as u8) {
+            assert_eq!(u8c, Utf8Char::from(cp as u8 as char));
+        }
+    }
+}
+
+#[test]
+fn from_bmp() {
+    for cp in 0u32..0x1_00_00 {
+        assert_eq!(
+            Utf16Char::from_bmp(cp as u16).ok(),
+            char::from_u32(cp).map(|u32c| Utf16Char::from(u32c) )
+        );
+    }
+}

vendor/encode_unicode/tests/iterators.rs

@@ -0,0 +1,182 @@
+/* Copyright 2018 The encode_unicode Developers
+ *
+ * Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or
+ * http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or
+ * http://opensource.org/licenses/MIT>, at your option. This file may not be
+ * copied, modified, or distributed except according to those terms.
+ */
+
+//! Iterator tests
+
+#![cfg(feature="std")]
+
+extern crate encode_unicode;
+
+use encode_unicode::{IterExt, SliceExt, CharExt};
+use encode_unicode::iterator::Utf8CharSplitter;
+use encode_unicode::error::InvalidUtf8Slice::*;
+use encode_unicode::error::InvalidUtf8::*;
+use encode_unicode::error::InvalidUtf8FirstByte::*;
+use encode_unicode::error::InvalidCodepoint::*;
+use encode_unicode::error::Utf16PairError::*;
+use std::io::Read;
+use std::cmp::min;
+
+#[test] fn utf8charmerger() {
+    let slice = b"\xf0\xa1\x92X\xcc\xbb";
+    let mut iter = slice.iter().to_utf8chars();
+    assert_eq!(iter.size_hint(), (1, Some(6)));
+    assert_eq!(format!("{:?}", &iter),
+               format!("Utf8CharMerger {{ buffered: [], inner: {:?} }}", slice.iter()));
+
+    assert_eq!(iter.next(), Some(Err(Utf8(NotAContinuationByte(3)))));
+    assert_eq!(iter.size_hint(), (0, Some(5)));
+    assert_eq!(
+        format!("{:?}", &iter),
+        format!("Utf8CharMerger {{ buffered: [161, 146, 88], inner: {:?} }}", slice[4..].iter())
+    );
+
+    assert_eq!(iter.next(), Some(Err(Utf8(FirstByte(ContinuationByte)))));
+    assert_eq!(iter.into_inner().next(), Some(&b'\xcc'));
+}
+
+#[test] fn utf8chardecoder() {
+    let slice = b"\xf4\xbf\x80\x80XY\xcc\xbbZ_";
+    let mut iter = slice.utf8char_indices();
+    assert_eq!(iter.size_hint(), (2, Some(10)));
+    assert_eq!(
+        format!("{:?}", &iter),
+        format!("Utf8CharDecoder {{ bytes[0..]: {:?} }}", &slice)
+    );
+
+    assert_eq!(iter.next(), Some((0, Err(Codepoint(TooHigh)), 1)));
+    assert_eq!(
+        format!("{:?}", &iter),
+        format!("Utf8CharDecoder {{ bytes[1..]: {:?} }}", &slice[1..])
+    );
+    assert_eq!(iter.size_hint(), (2, Some(9)));
+    assert_eq!(iter.count(), 8);
+}
+
+#[test] fn utf16charmerger() {
+    let slice = [0xd800, 'x' as u16, 0xd900, 0xdfff, 'λ' as u16];
+    let mut iter = slice.iter().to_utf16chars();
+    assert_eq!(iter.size_hint(), (2, Some(5)));
+    assert_eq!(format!("{:?}", &iter),
+               format!("Utf16CharMerger {{ buffered: None, inner: {:?} }}", slice.iter()));
+
+    assert_eq!(iter.next(), Some(Err(UnmatchedLeadingSurrogate)));
+    assert_eq!(iter.size_hint(), (1, Some(4)));
+    assert_eq!(
+        format!("{:?}", &iter),
+        format!("Utf16CharMerger {{ buffered: Some(120), inner: {:?} }}", slice[2..].iter())
+    );
+
+    assert_eq!(iter.into_inner().next(), Some(&0xd900));
+}
+
+#[test] fn utf16chardecoder() {
+    let slice = [0xd800, 'x' as u16, 0xd900, 0xdfff, 'λ' as u16];
+    let mut iter = slice.utf16char_indices();
+    assert_eq!(iter.size_hint(), (2, Some(5)));
+    assert_eq!(
+        format!("{:?}", &iter),
+        format!("Utf16CharDecoder {{ units[0..]: {:?} }}", &slice)
+    );
+
+    assert_eq!(iter.next(), Some((0, Err(UnmatchedLeadingSurrogate), 1)));
+    assert_eq!(
+        format!("{:?}", &iter),
+        format!("Utf16CharDecoder {{ units[1..]: {:?} }}", &slice[1..])
+    );
+    assert_eq!(iter.size_hint(), (2, Some(4)));
+    assert_eq!(iter.count(), 3);
+}
+
+
+
+/// Tests for ensuring that iterators which also implement Read support
+/// interleaving calls of `read()` and `next()`, and that they implement Read
+/// correctly (support any buffer size at any time).
+
+#[test] fn read_single_ascii() {
+    let uc = 'a'.to_utf8();
+    assert_eq!(uc.len(), 1);
+    for chunk in 1..5 {
+        let mut buf = [b'E'; 6];
+        let mut iter = uc.into_iter();
+        let mut written = 0;
+        for _ in 0..4 {
+            assert_eq!(iter.read(&mut buf[..0]).unwrap(), 0);
+            let wrote = iter.read(&mut buf[written..written+chunk]).unwrap();
+            assert_eq!(wrote, min(1-written, chunk));
+            written += wrote;
+            for &b in &buf[written..] {assert_eq!(b, b'E');}
+            assert_eq!(buf[..written], AsRef::<[u8]>::as_ref(&uc)[..written]);
+        }
+        assert_eq!(written, 1);
+    }
+}
+
+#[test] fn read_single_nonascii() {
+    let uc = 'ä'.to_utf8();
+    assert_eq!(uc.len(), 2);
+    for chunk in 1..5 {
+        let mut buf = [b'E'; 6];
+        let mut iter = uc.into_iter();
+        let mut written = 0;
+        for _ in 0..4 {
+            assert_eq!(iter.read(&mut buf[..0]).unwrap(), 0);
+            let wrote = iter.read(&mut buf[written..written+chunk]).unwrap();
+            assert_eq!(wrote, min(2-written, chunk));
+            written += wrote;
+            for &b in &buf[written..] {assert_eq!(b, b'E');}
+            assert_eq!(buf[..written], AsRef::<[u8]>::as_ref(&uc)[..written]);
+        }
+        assert_eq!(written, 2);
+    }
+}
+
+
+#[test] fn utf8charsplitter_read_all_sizes() {
+    let s = "1111\u{104444}\u{222}1\u{833}1111\u{100004}";
+    assert!(s.len()%3 == 1);
+    let mut buf = vec![b'E'; s.len()+6];
+    for size in 2..6 {//s.len()+4 {
+        let mut reader = Utf8CharSplitter::from(s.chars().map(|c| c.to_utf8() ));
+        for (offset, part) in s.as_bytes().chunks(size).enumerate() {
+            let read_to = if part.len() == size {(offset+1)*size} else {buf.len()};
+            assert_eq!(reader.read(&mut buf[offset*size..read_to]).unwrap(), part.len());
+            assert_eq!(&buf[..offset*size+part.len()], &s.as_bytes()[..offset*size+part.len()]);
+        }
+        assert_eq!(reader.read(&mut buf[..]).unwrap(), 0);
+        assert!(buf[s.len()..].iter().all(|&b| b==b'E' ));
+    }
+}
+
+#[test] fn utf8charsplitter_alternate_iter_read() {
+    let s = "1111\u{104444}\u{222}1\u{833}1111\u{100004}";
+    let mut buf = [b'0'; 10];
+    for n in 0..2 {
+        // need to collect to test size_hint()
+        // because chars().size_hint() returns ((bytes+3)/4, Some(bytes))
+        let u8chars = s.chars().map(|c| c.to_utf8() ).collect::<Vec<_>>();
+        let mut iter: Utf8CharSplitter<_,_> = u8chars.into_iter().into();
+        for (i, byte) in s.bytes().enumerate() {
+            let until_next = s.as_bytes()[i..].iter().take_while(|&b| (b>>6)==0b10u8 ).count();
+            let remaining_chars = s[i+until_next..].chars().count();
+            println!("{}. run: byte {:02} of {}, remaining: {:02}+{}: 0b{:08b} = {:?}",
+                     n, i, s.len(), remaining_chars, until_next, byte, byte as char);
+            assert_eq!(iter.read(&mut[][..]).unwrap(), 0);
+            if i % 2 == n {
+                assert_eq!(iter.next(), Some(byte));
+            } else {
+                assert_eq!(iter.read(&mut buf[..1]).unwrap(), 1);
+                assert_eq!(buf[0], byte);
+            }
+        }
+        assert_eq!(iter.size_hint(), (0, Some(0)));
+        assert_eq!(iter.next(), None);
+        assert_eq!(iter.read(&mut buf[..]).unwrap(), 0);
+    }
+}

vendor/encode_unicode/tests/oks.rs

@@ -0,0 +1,284 @@
+/* Copyright 2016 The encode_unicode Developers
+ *
+ * Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or
+ * http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or
+ * http://opensource.org/licenses/MIT>, at your option. This file may not be
+ * copied, modified, or distributed except according to those terms.
+ */
+
+//! Test that every method gives the correct result for valid values.
+//! Except iterators, which are stateful.
+
+use std::char;
+use std::str::{self,FromStr};
+use std::cmp::Ordering;
+use std::hash::{Hash,Hasher};
+use std::collections::hash_map::DefaultHasher;
+#[allow(deprecated,unused)]
+use std::ascii::AsciiExt;
+use std::iter::FromIterator;
+extern crate encode_unicode;
+use encode_unicode::*;
+
+
+#[test]
+fn equal_defaults() {
+    assert_eq!(Utf8Char::default().to_char(), char::default());
+    assert_eq!(Utf16Char::default().to_char(), char::default());
+}
+
+#[test]
+fn same_size_as_char() {
+    use std::mem::size_of;
+    assert_eq!(size_of::<Utf8Char>(), size_of::<char>());
+    assert_eq!(size_of::<Utf16Char>(), size_of::<char>());
+}
+
+#[test]
+fn utf16chars_to_string() {
+    let s = "aå\u{10ffff}‽\u{100000}\u{fee1}";
+    let u16cs = s.chars().map(|c| Utf16Char::from(c) ).collect::<Vec<Utf16Char>>();
+
+    let mut from_refs: String = u16cs.iter().collect();
+    assert_eq!(&from_refs, s);
+    from_refs.extend(&u16cs);
+    assert_eq!(&from_refs[s.len()..], s);
+
+    let mut from_vals: String = u16cs.iter().cloned().collect();
+    assert_eq!(&from_vals, s);
+    from_vals.extend(u16cs);
+    assert_eq!(&from_vals[s.len()..], s);
+}
+
+
+const EDGES_AND_BETWEEN: [char;19] = [
+    '\u{0}',// min
+    '\u{3b}',// middle ASCII
+    'A',// min ASCII uppercase
+    'N',// middle ASCII uppercase
+    'Z',// max ASCII uppercase
+    'a',// min ASCII lowercase
+    'm',// middle ASCII lowercase
+    'z',// max ASCII lowercase
+    '\u{7f}',// max ASCII and 1-byte UTF-8
+    '\u{80}',// min 2-byte UTF-8
+    '\u{111}',// middle
+    '\u{7ff}',// max 2-byte UTF-8
+    '\u{800}',// min 3-byte UTF-8
+    '\u{d7ff}',// before reserved
+    '\u{e000}',// after reserved
+    '\u{ffff}',// max UTF-16 single and 3-byte UTF-8
+    '\u{10000}',// min UTF-16 surrogate and 4-byte UTF-8
+    '\u{abcde}',// middle
+    '\u{10ffff}',// max
+];
+
+fn eq_cmp_hash(c: char) -> (Utf8Char, Utf16Char) {
+    fn hash<T:Hash>(v: T) -> u64 {
+        #[allow(deprecated)]
+        let mut hasher = DefaultHasher::new();
+        v.hash(&mut hasher);
+        hasher.finish()
+    }
+    let u8c = c.to_utf8();
+    assert_eq!(u8c.to_char(), c);
+    assert_eq!(u8c, u8c);
+    assert_eq!(hash(u8c), hash(u8c));
+    assert_eq!(u8c.cmp(&u8c), Ordering::Equal);
+    assert!(u8c.eq_ignore_ascii_case(&u8c));
+    let u16c = c.to_utf16();
+    assert_eq!(u16c.to_char(), c);
+    assert_eq!(u16c, u16c);
+    assert_eq!(hash(u16c), hash(c));
+    assert_eq!(u16c.cmp(&u16c), Ordering::Equal);
+    assert!(u16c.eq_ignore_ascii_case(&u16c));
+
+    assert_eq!(u8c, c);
+    assert_eq!(c, u8c);
+    assert_eq!(u16c, c);
+    assert_eq!(c, u16c);
+    assert_eq!(u8c, u16c);
+    assert_eq!(u16c, u8c);
+    assert_eq!(u8c == c as u8,  c <= '\u{7F}');
+    assert_eq!(u16c == c as u8,  c <= '\u{FF}');
+    assert_eq!(u16c == c as u16,  c <= '\u{FFFF}');
+
+    assert_eq!(u8c.partial_cmp(&c), Some(Ordering::Equal));
+    assert_eq!(c.partial_cmp(&u8c), Some(Ordering::Equal));
+    assert_eq!(u16c.partial_cmp(&c), Some(Ordering::Equal));
+    assert_eq!(c.partial_cmp(&u16c), Some(Ordering::Equal));
+    assert_eq!(u8c.partial_cmp(&u16c), Some(Ordering::Equal));
+    assert_eq!(u16c.partial_cmp(&u8c), Some(Ordering::Equal));
+
+
+    for &other in &EDGES_AND_BETWEEN {
+        let u8other = other.to_utf8();
+        assert_eq!(u8c == u8other,  c == other);
+        assert_eq!(hash(u8c)==hash(u8other),  hash(c)==hash(other));
+        assert_eq!(u8c.cmp(&u8other), c.cmp(&other));
+        assert_eq!(u8c.eq_ignore_ascii_case(&u8other), c.eq_ignore_ascii_case(&other));
+        assert_eq!(u8c.partial_cmp(&other), c.partial_cmp(&other));
+        assert_eq!(c.partial_cmp(&u8other), c.partial_cmp(&other));
+        assert_eq!(u8other.partial_cmp(&c), other.partial_cmp(&c));
+        assert_eq!(other.partial_cmp(&u8c), other.partial_cmp(&c));
+        assert_eq!(u8c == other as u8,  other as u8 <= 127 && c == other as u8 as char);
+
+        let u16other = other.to_utf16();
+        assert_eq!(u16c == u16other,  c == other);
+        assert_eq!(hash(u16c)==hash(u16other),  hash(c)==hash(other));
+        assert_eq!(u16c.cmp(&u16other), c.cmp(&other));
+        assert_eq!(u16c.eq_ignore_ascii_case(&u16other), c.eq_ignore_ascii_case(&other));
+        assert_eq!(u16c.partial_cmp(&other), c.partial_cmp(&other));
+        assert_eq!(c.partial_cmp(&u16other), c.partial_cmp(&other));
+        assert_eq!(u16other.partial_cmp(&c), other.partial_cmp(&c));
+        assert_eq!(other.partial_cmp(&u16c), other.partial_cmp(&c));
+        assert_eq!(u16c == other as u8,  c == other as u8 as char);
+        assert_eq!(u16c == other as u16,  c as u32 == other as u16 as u32);
+
+        assert_eq!(u8c == u16other,  c == other);
+        assert_eq!(u16c == u8other,  c == other);
+        assert_eq!(u8c.partial_cmp(&u16other),  c.partial_cmp(&other));
+        assert_eq!(u16c.partial_cmp(&u8other),  c.partial_cmp(&other));
+        assert_eq!(u8other.partial_cmp(&u16c),  other.partial_cmp(&c));
+        assert_eq!(u16other.partial_cmp(&u8c),  other.partial_cmp(&c));
+    }
+    (u8c, u16c)
+}
+
+fn iterators(c: char) {
+    let mut iter = c.iter_utf8_bytes();
+    let mut buf = [0; 4];
+    let mut iter_ref = c.encode_utf8(&mut buf[..]).as_bytes().iter();
+    for _ in 0..6 {
+        assert_eq!(iter.size_hint(), iter_ref.size_hint());
+        assert_eq!(format!("{:?}", iter), format!("{:?}", iter_ref.as_slice()));
+        assert_eq!(iter.next(), iter_ref.next().cloned());
+    }
+
+    let mut iter = c.iter_utf16_units();
+    let mut buf = [0; 2];
+    let mut iter_ref = c.encode_utf16(&mut buf[..]).iter();
+    for _ in 0..4 {
+        assert_eq!(iter.size_hint(), iter_ref.size_hint());
+        assert_eq!(format!("{:?}", iter), format!("{:?}", iter_ref.as_slice()));
+        assert_eq!(iter.next(), iter_ref.next().cloned());
+    }
+}
+
+fn test(c: char) {
+    assert_eq!(char::from_u32(c as u32), Some(c));
+    assert_eq!(char::from_u32_detailed(c as u32), Ok(c));
+    assert_eq!(unsafe{ char::from_u32_unchecked(c as u32) }, c);
+    let (u8c, u16c) = eq_cmp_hash(c);
+    iterators(c);
+    assert_eq!(Utf16Char::from(u8c), u16c);
+    assert_eq!(Utf8Char::from(u16c), u8c);
+    let utf8_len = c.len_utf8();
+    let utf16_len = c.len_utf16();
+    let mut as_str = c.to_string();
+
+    // UTF-8
+    let mut buf = [0; 4];
+    let reference = c.encode_utf8(&mut buf[..]).as_bytes();
+    let len = reference.len(); // short name because it is used in many places.
+    assert_eq!(len, utf8_len);
+    assert_eq!(reference[0].extra_utf8_bytes(), Ok(len-1));
+    assert_eq!(reference[0].extra_utf8_bytes_unchecked(), len-1);
+    assert_eq!(AsRef::<[u8]>::as_ref(&u8c), reference);
+
+    let (arr,arrlen) = u8c.to_array();
+    assert_eq!(arrlen, len);
+    assert_eq!(Utf8Char::from_array(arr), Ok(u8c));
+    assert_eq!(c.to_utf8_array(),  (arr, len));
+
+    let str_ = str::from_utf8(reference).unwrap();
+    let ustr = Utf8Char::from_str(str_).unwrap();
+    assert_eq!(ustr.to_array().0, arr);// bitwise equality
+    assert_eq!(char::from_utf8_array(arr), Ok(c));
+    let mut longer = [0xff; 5]; // 0xff is never valid
+    longer[..len].copy_from_slice(reference);
+    assert_eq!(char::from_utf8_slice_start(reference), Ok((c,len)));
+    assert_eq!(char::from_utf8_slice_start(&longer), Ok((c,len)));
+    assert_eq!(Utf8Char::from_slice_start(reference), Ok((u8c,len)));
+    assert_eq!(Utf8Char::from_slice_start(&longer), Ok((u8c,len)));
+    for other in &mut longer[len..] {*other = b'?'}
+    assert_eq!(Utf8Char::from_str(str_), Ok(u8c));
+    assert_eq!(Utf8Char::from_str_start(str_), Ok((u8c,len)));
+    assert_eq!(Utf8Char::from_str_start(str::from_utf8(&longer).unwrap()), Ok((u8c,len)));
+    unsafe {
+        // Hopefully make bugs easier to catch by making reads into unallocated memory by filling
+        // a jemalloc bin. See table on http://jemalloc.net/jemalloc.3.html for bin sizes.
+        // I have no idea whether this works.
+        let mut boxed = Box::new([0xffu8; 16]);
+        let start = boxed.len()-len; // reach the end
+        boxed[start..].copy_from_slice(reference);
+        let slice = &boxed[start..start]; // length of slice should be ignored.
+        assert_eq!(Utf8Char::from_slice_start_unchecked(slice), (u8c,len));
+    }
+    assert_eq!(&Vec::<u8>::from_iter(Some(u8c))[..], reference);
+    assert_eq!(&String::from_iter(Some(u8c))[..], str_);
+    assert_eq!(format!("{:?}", u8c), format!("{:?}", c));
+    assert_eq!(format!("{}", u8c), format!("{}", c));
+    assert_eq!(u8c.is_ascii(), c.is_ascii());
+    assert_eq!(u8c.to_ascii_lowercase().to_char(), c.to_ascii_lowercase());
+    assert_eq!(u8c.to_ascii_uppercase().to_char(), c.to_ascii_uppercase());
+
+    // UTF-16
+    let mut buf = [0; 2];
+    let reference = c.encode_utf16(&mut buf[..]);
+    let len = reference.len();
+    assert_eq!(len, utf16_len);
+    assert_eq!(reference[0].utf16_needs_extra_unit(), Ok(len==2));
+    assert_eq!(reference[0].is_utf16_leading_surrogate(), len==2);
+    assert_eq!(u16c.as_ref(), reference);
+    let mut longer = [0; 3];
+    longer[..len].copy_from_slice(reference);
+    assert_eq!(char::from_utf16_slice_start(reference), Ok((c,len)));
+    assert_eq!(char::from_utf16_slice_start(&longer), Ok((c,len)));
+    assert_eq!(Utf16Char::from_slice_start(reference), Ok((u16c,len)));
+    assert_eq!(Utf16Char::from_slice_start(&longer), Ok((u16c,len)));
+    assert_eq!(Utf16Char::from_str(&as_str), Ok(u16c));
+    as_str.push(c);
+    assert_eq!(Utf16Char::from_str_start(&as_str), Ok((u16c,utf8_len)));
+    unsafe {
+        // Hopefully make bugs easier to catch by making reads into unallocated memory by filling
+        // a jemalloc bin. See table on http://jemalloc.net/jemalloc.3.html for bin sizes.
+        // I have no idea whether this works.
+        let mut boxed = Box::new([0u16; 8]);
+        let start = boxed.len()-len; // reach the end
+        boxed[start..].copy_from_slice(reference);
+        let slice = &boxed[start..start]; // length of slice should be ignored.
+        assert_eq!(Utf16Char::from_slice_start_unchecked(slice), (u16c,len));
+    }
+    let array = c.to_utf16_array();
+    let tuple = c.to_utf16_tuple();
+    assert_eq!(&array[..reference.len()], reference);
+    assert_eq!(tuple, (reference[0],reference.get(1).cloned()));
+    assert_eq!(char::from_utf16_array(array), Ok(c));
+    assert_eq!(char::from_utf16_tuple(tuple), Ok(c));
+    assert_eq!(c.to_utf16().to_char(), c);
+    assert_eq!(&Vec::<u16>::from_iter(Some(u16c))[..], reference);
+    assert_eq!(format!("{:?}", u16c), format!("{:?}", c));
+    assert_eq!(format!("{}", u16c), format!("{}", c));
+    assert_eq!(u16c.is_ascii(), c.is_ascii());
+    assert_eq!(u16c.to_ascii_lowercase().to_char(), c.to_ascii_lowercase());
+    assert_eq!(u16c.to_ascii_uppercase().to_char(), c.to_ascii_uppercase());
+}
+
+
+#[test]
+fn edges_middle() {
+    for &c in &EDGES_AND_BETWEEN {
+        test(c);
+    }
+}
+
+
+#[test]
+#[ignore]
+fn all() {
+    for cp in std::iter::Iterator::chain(0..0xd800, 0xe000..0x110000) {
+        let c = char::from_u32(cp).expect("not a valid char");
+        test(c);
+    }
+}