1 files changed, 360 insertions, 0 deletions
diff --git a/library/core/tests/char.rs b/library/core/tests/char.rs
new file mode 100644
index 00000000000..c16f54081ce
--- /dev/null
+++ b/library/core/tests/char.rs
@@ -0,0 +1,360 @@
+use std::convert::TryFrom;
+use std::str::FromStr;
+use std::{char, str};
+
+#[test]
+fn test_convert() {
+    assert_eq!(u32::from('a'), 0x61);
+    assert_eq!(char::from(b'\0'), '\0');
+    assert_eq!(char::from(b'a'), 'a');
+    assert_eq!(char::from(b'\xFF'), '\u{FF}');
+    assert_eq!(char::try_from(0_u32), Ok('\0'));
+    assert_eq!(char::try_from(0x61_u32), Ok('a'));
+    assert_eq!(char::try_from(0xD7FF_u32), Ok('\u{D7FF}'));
+    assert!(char::try_from(0xD800_u32).is_err());
+    assert!(char::try_from(0xDFFF_u32).is_err());
+    assert_eq!(char::try_from(0xE000_u32), Ok('\u{E000}'));
+    assert_eq!(char::try_from(0x10FFFF_u32), Ok('\u{10FFFF}'));
+    assert!(char::try_from(0x110000_u32).is_err());
+    assert!(char::try_from(0xFFFF_FFFF_u32).is_err());
+}
+
+#[test]
+fn test_from_str() {
+    assert_eq!(char::from_str("a").unwrap(), 'a');
+    assert_eq!(char::from_str("\0").unwrap(), '\0');
+    assert_eq!(char::from_str("\u{D7FF}").unwrap(), '\u{d7FF}');
+    assert!(char::from_str("").is_err());
+    assert!(char::from_str("abc").is_err());
+}
+
+#[test]
+fn test_is_lowercase() {
+    assert!('a'.is_lowercase());
+    assert!('ö'.is_lowercase());
+    assert!('ß'.is_lowercase());
+    assert!(!'Ü'.is_lowercase());
+    assert!(!'P'.is_lowercase());
+}
+
+#[test]
+fn test_is_uppercase() {
+    assert!(!'h'.is_uppercase());
+    assert!(!'ä'.is_uppercase());
+    assert!(!'ß'.is_uppercase());
+    assert!('Ö'.is_uppercase());
+    assert!('T'.is_uppercase());
+}
+
+#[test]
+fn test_is_whitespace() {
+    assert!(' '.is_whitespace());
+    assert!('\u{2007}'.is_whitespace());
+    assert!('\t'.is_whitespace());
+    assert!('\n'.is_whitespace());
+    assert!(!'a'.is_whitespace());
+    assert!(!'_'.is_whitespace());
+    assert!(!'\u{0}'.is_whitespace());
+}
+
+#[test]
+fn test_to_digit() {
+    assert_eq!('0'.to_digit(10), Some(0));
+    assert_eq!('1'.to_digit(2), Some(1));
+    assert_eq!('2'.to_digit(3), Some(2));
+    assert_eq!('9'.to_digit(10), Some(9));
+    assert_eq!('a'.to_digit(16), Some(10));
+    assert_eq!('A'.to_digit(16), Some(10));
+    assert_eq!('b'.to_digit(16), Some(11));
+    assert_eq!('B'.to_digit(16), Some(11));
+    assert_eq!('z'.to_digit(36), Some(35));
+    assert_eq!('Z'.to_digit(36), Some(35));
+    assert_eq!(' '.to_digit(10), None);
+    assert_eq!('$'.to_digit(36), None);
+}
+
+#[test]
+fn test_to_lowercase() {
+    fn lower(c: char) -> String {
+        let to_lowercase = c.to_lowercase();
+        assert_eq!(to_lowercase.len(), to_lowercase.count());
+        let iter: String = c.to_lowercase().collect();
+        let disp: String = c.to_lowercase().to_string();
+        assert_eq!(iter, disp);
+        iter
+    }
+    assert_eq!(lower('A'), "a");
+    assert_eq!(lower('Ö'), "ö");
+    assert_eq!(lower('ß'), "ß");
+    assert_eq!(lower('Ü'), "ü");
+    assert_eq!(lower('💩'), "💩");
+    assert_eq!(lower('Σ'), "σ");
+    assert_eq!(lower('Τ'), "τ");
+    assert_eq!(lower('Ι'), "ι");
+    assert_eq!(lower('Γ'), "γ");
+    assert_eq!(lower('Μ'), "μ");
+    assert_eq!(lower('Α'), "α");
+    assert_eq!(lower('Σ'), "σ");
+    assert_eq!(lower('ǅ'), "ǆ");
+    assert_eq!(lower('ﬁ'), "ﬁ");
+    assert_eq!(lower('İ'), "i\u{307}");
+}
+
+#[test]
+fn test_to_uppercase() {
+    fn upper(c: char) -> String {
+        let to_uppercase = c.to_uppercase();
+        assert_eq!(to_uppercase.len(), to_uppercase.count());
+        let iter: String = c.to_uppercase().collect();
+        let disp: String = c.to_uppercase().to_string();
+        assert_eq!(iter, disp);
+        iter
+    }
+    assert_eq!(upper('a'), "A");
+    assert_eq!(upper('ö'), "Ö");
+    assert_eq!(upper('ß'), "SS"); // not ẞ: Latin capital letter sharp s
+    assert_eq!(upper('ü'), "Ü");
+    assert_eq!(upper('💩'), "💩");
+
+    assert_eq!(upper('σ'), "Σ");
+    assert_eq!(upper('τ'), "Τ");
+    assert_eq!(upper('ι'), "Ι");
+    assert_eq!(upper('γ'), "Γ");
+    assert_eq!(upper('μ'), "Μ");
+    assert_eq!(upper('α'), "Α");
+    assert_eq!(upper('ς'), "Σ");
+    assert_eq!(upper('ǅ'), "Ǆ");
+    assert_eq!(upper('ﬁ'), "FI");
+    assert_eq!(upper('ᾀ'), "ἈΙ");
+}
+
+#[test]
+fn test_is_control() {
+    assert!('\u{0}'.is_control());
+    assert!('\u{3}'.is_control());
+    assert!('\u{6}'.is_control());
+    assert!('\u{9}'.is_control());
+    assert!('\u{7f}'.is_control());
+    assert!('\u{92}'.is_control());
+    assert!(!'\u{20}'.is_control());
+    assert!(!'\u{55}'.is_control());
+    assert!(!'\u{68}'.is_control());
+}
+
+#[test]
+fn test_is_numeric() {
+    assert!('2'.is_numeric());
+    assert!('7'.is_numeric());
+    assert!('¾'.is_numeric());
+    assert!(!'c'.is_numeric());
+    assert!(!'i'.is_numeric());
+    assert!(!'z'.is_numeric());
+    assert!(!'Q'.is_numeric());
+}
+
+#[test]
+fn test_escape_debug() {
+    fn string(c: char) -> String {
+        let iter: String = c.escape_debug().collect();
+        let disp: String = c.escape_debug().to_string();
+        assert_eq!(iter, disp);
+        iter
+    }
+    assert_eq!(string('\n'), "\\n");
+    assert_eq!(string('\r'), "\\r");
+    assert_eq!(string('\''), "\\'");
+    assert_eq!(string('"'), "\\\"");
+    assert_eq!(string(' '), " ");
+    assert_eq!(string('a'), "a");
+    assert_eq!(string('~'), "~");
+    assert_eq!(string('é'), "é");
+    assert_eq!(string('文'), "文");
+    assert_eq!(string('\x00'), "\\u{0}");
+    assert_eq!(string('\x1f'), "\\u{1f}");
+    assert_eq!(string('\x7f'), "\\u{7f}");
+    assert_eq!(string('\u{80}'), "\\u{80}");
+    assert_eq!(string('\u{ff}'), "\u{ff}");
+    assert_eq!(string('\u{11b}'), "\u{11b}");
+    assert_eq!(string('\u{1d4b6}'), "\u{1d4b6}");
+    assert_eq!(string('\u{301}'), "\\u{301}"); // combining character
+    assert_eq!(string('\u{200b}'), "\\u{200b}"); // zero width space
+    assert_eq!(string('\u{e000}'), "\\u{e000}"); // private use 1
+    assert_eq!(string('\u{100000}'), "\\u{100000}"); // private use 2
+}
+
+#[test]
+fn test_escape_default() {
+    fn string(c: char) -> String {
+        let iter: String = c.escape_default().collect();
+        let disp: String = c.escape_default().to_string();
+        assert_eq!(iter, disp);
+        iter
+    }
+    assert_eq!(string('\n'), "\\n");
+    assert_eq!(string('\r'), "\\r");
+    assert_eq!(string('\''), "\\'");
+    assert_eq!(string('"'), "\\\"");
+    assert_eq!(string(' '), " ");
+    assert_eq!(string('a'), "a");
+    assert_eq!(string('~'), "~");
+    assert_eq!(string('é'), "\\u{e9}");
+    assert_eq!(string('\x00'), "\\u{0}");
+    assert_eq!(string('\x1f'), "\\u{1f}");
+    assert_eq!(string('\x7f'), "\\u{7f}");
+    assert_eq!(string('\u{80}'), "\\u{80}");
+    assert_eq!(string('\u{ff}'), "\\u{ff}");
+    assert_eq!(string('\u{11b}'), "\\u{11b}");
+    assert_eq!(string('\u{1d4b6}'), "\\u{1d4b6}");
+    assert_eq!(string('\u{200b}'), "\\u{200b}"); // zero width space
+    assert_eq!(string('\u{e000}'), "\\u{e000}"); // private use 1
+    assert_eq!(string('\u{100000}'), "\\u{100000}"); // private use 2
+}
+
+#[test]
+fn test_escape_unicode() {
+    fn string(c: char) -> String {
+        let iter: String = c.escape_unicode().collect();
+        let disp: String = c.escape_unicode().to_string();
+        assert_eq!(iter, disp);
+        iter
+    }
+
+    assert_eq!(string('\x00'), "\\u{0}");
+    assert_eq!(string('\n'), "\\u{a}");
+    assert_eq!(string(' '), "\\u{20}");
+    assert_eq!(string('a'), "\\u{61}");
+    assert_eq!(string('\u{11b}'), "\\u{11b}");
+    assert_eq!(string('\u{1d4b6}'), "\\u{1d4b6}");
+}
+
+#[test]
+fn test_encode_utf8() {
+    fn check(input: char, expect: &[u8]) {
+        let mut buf = [0; 4];
+        let ptr = buf.as_ptr();
+        let s = input.encode_utf8(&mut buf);
+        assert_eq!(s.as_ptr() as usize, ptr as usize);
+        assert!(str::from_utf8(s.as_bytes()).is_ok());
+        assert_eq!(s.as_bytes(), expect);
+    }
+
+    check('x', &[0x78]);
+    check('\u{e9}', &[0xc3, 0xa9]);
+    check('\u{a66e}', &[0xea, 0x99, 0xae]);
+    check('\u{1f4a9}', &[0xf0, 0x9f, 0x92, 0xa9]);
+}
+
+#[test]
+fn test_encode_utf16() {
+    fn check(input: char, expect: &[u16]) {
+        let mut buf = [0; 2];
+        let ptr = buf.as_mut_ptr();
+        let b = input.encode_utf16(&mut buf);
+        assert_eq!(b.as_mut_ptr() as usize, ptr as usize);
+        assert_eq!(b, expect);
+    }
+
+    check('x', &[0x0078]);
+    check('\u{e9}', &[0x00e9]);
+    check('\u{a66e}', &[0xa66e]);
+    check('\u{1f4a9}', &[0xd83d, 0xdca9]);
+}
+
+#[test]
+fn test_len_utf16() {
+    assert!('x'.len_utf16() == 1);
+    assert!('\u{e9}'.len_utf16() == 1);
+    assert!('\u{a66e}'.len_utf16() == 1);
+    assert!('\u{1f4a9}'.len_utf16() == 2);
+}
+
+#[test]
+fn test_decode_utf16() {
+    fn check(s: &[u16], expected: &[Result<char, u16>]) {
+        let v = char::decode_utf16(s.iter().cloned())
+            .map(|r| r.map_err(|e| e.unpaired_surrogate()))
+            .collect::<Vec<_>>();
+        assert_eq!(v, expected);
+    }
+    check(&[0xD800, 0x41, 0x42], &[Err(0xD800), Ok('A'), Ok('B')]);
+    check(&[0xD800, 0], &[Err(0xD800), Ok('\0')]);
+}
+
+#[test]
+fn ed_iterator_specializations() {
+    // Check counting
+    assert_eq!('\n'.escape_default().count(), 2);
+    assert_eq!('c'.escape_default().count(), 1);
+    assert_eq!(' '.escape_default().count(), 1);
+    assert_eq!('\\'.escape_default().count(), 2);
+    assert_eq!('\''.escape_default().count(), 2);
+
+    // Check nth
+
+    // Check that OoB is handled correctly
+    assert_eq!('\n'.escape_default().nth(2), None);
+    assert_eq!('c'.escape_default().nth(1), None);
+    assert_eq!(' '.escape_default().nth(1), None);
+    assert_eq!('\\'.escape_default().nth(2), None);
+    assert_eq!('\''.escape_default().nth(2), None);
+
+    // Check the first char
+    assert_eq!('\n'.escape_default().nth(0), Some('\\'));
+    assert_eq!('c'.escape_default().nth(0), Some('c'));
+    assert_eq!(' '.escape_default().nth(0), Some(' '));
+    assert_eq!('\\'.escape_default().nth(0), Some('\\'));
+    assert_eq!('\''.escape_default().nth(0), Some('\\'));
+
+    // Check the second char
+    assert_eq!('\n'.escape_default().nth(1), Some('n'));
+    assert_eq!('\\'.escape_default().nth(1), Some('\\'));
+    assert_eq!('\''.escape_default().nth(1), Some('\''));
+
+    // Check the last char
+    assert_eq!('\n'.escape_default().last(), Some('n'));
+    assert_eq!('c'.escape_default().last(), Some('c'));
+    assert_eq!(' '.escape_default().last(), Some(' '));
+    assert_eq!('\\'.escape_default().last(), Some('\\'));
+    assert_eq!('\''.escape_default().last(), Some('\''));
+}
+
+#[test]
+fn eu_iterator_specializations() {
+    fn check(c: char) {
+        let len = c.escape_unicode().count();
+
+        // Check OoB
+        assert_eq!(c.escape_unicode().nth(len), None);
+
+        // For all possible in-bound offsets
+        let mut iter = c.escape_unicode();
+        for offset in 0..len {
+            // Check last
+            assert_eq!(iter.clone().last(), Some('}'));
+
+            // Check len
+            assert_eq!(iter.len(), len - offset);
+
+            // Check size_hint (= len in ExactSizeIterator)
+            assert_eq!(iter.size_hint(), (iter.len(), Some(iter.len())));
+
+            // Check counting
+            assert_eq!(iter.clone().count(), len - offset);
+
+            // Check nth
+            assert_eq!(c.escape_unicode().nth(offset), iter.next());
+        }
+
+        // Check post-last
+        assert_eq!(iter.clone().last(), None);
+        assert_eq!(iter.clone().count(), 0);
+    }
+
+    check('\u{0}');
+    check('\u{1}');
+    check('\u{12}');
+    check('\u{123}');
+    check('\u{1234}');
+    check('\u{12340}');
+    check('\u{10FFFF}');
+}