1 files changed, 118 insertions, 0 deletions
diff --git a/library/core/tests/cmp.rs b/library/core/tests/cmp.rs
new file mode 100644
index 00000000000..4086917780f
--- /dev/null
+++ b/library/core/tests/cmp.rs
@@ -0,0 +1,118 @@
+use core::cmp::{self, Ordering::*};
+
+#[test]
+fn test_int_totalord() {
+    assert_eq!(5.cmp(&10), Less);
+    assert_eq!(10.cmp(&5), Greater);
+    assert_eq!(5.cmp(&5), Equal);
+    assert_eq!((-5).cmp(&12), Less);
+    assert_eq!(12.cmp(&-5), Greater);
+}
+
+#[test]
+fn test_bool_totalord() {
+    assert_eq!(true.cmp(&false), Greater);
+    assert_eq!(false.cmp(&true), Less);
+    assert_eq!(true.cmp(&true), Equal);
+    assert_eq!(false.cmp(&false), Equal);
+}
+
+#[test]
+fn test_mut_int_totalord() {
+    assert_eq!((&mut 5).cmp(&&mut 10), Less);
+    assert_eq!((&mut 10).cmp(&&mut 5), Greater);
+    assert_eq!((&mut 5).cmp(&&mut 5), Equal);
+    assert_eq!((&mut -5).cmp(&&mut 12), Less);
+    assert_eq!((&mut 12).cmp(&&mut -5), Greater);
+}
+
+#[test]
+fn test_ord_max_min() {
+    assert_eq!(1.max(2), 2);
+    assert_eq!(2.max(1), 2);
+    assert_eq!(1.min(2), 1);
+    assert_eq!(2.min(1), 1);
+    assert_eq!(1.max(1), 1);
+    assert_eq!(1.min(1), 1);
+}
+
+#[test]
+fn test_ord_min_max_by() {
+    let f = |x: &i32, y: &i32| x.abs().cmp(&y.abs());
+    assert_eq!(cmp::min_by(1, -1, f), 1);
+    assert_eq!(cmp::min_by(1, -2, f), 1);
+    assert_eq!(cmp::min_by(2, -1, f), -1);
+    assert_eq!(cmp::max_by(1, -1, f), -1);
+    assert_eq!(cmp::max_by(1, -2, f), -2);
+    assert_eq!(cmp::max_by(2, -1, f), 2);
+}
+
+#[test]
+fn test_ord_min_max_by_key() {
+    let f = |x: &i32| x.abs();
+    assert_eq!(cmp::min_by_key(1, -1, f), 1);
+    assert_eq!(cmp::min_by_key(1, -2, f), 1);
+    assert_eq!(cmp::min_by_key(2, -1, f), -1);
+    assert_eq!(cmp::max_by_key(1, -1, f), -1);
+    assert_eq!(cmp::max_by_key(1, -2, f), -2);
+    assert_eq!(cmp::max_by_key(2, -1, f), 2);
+}
+
+#[test]
+fn test_ordering_reverse() {
+    assert_eq!(Less.reverse(), Greater);
+    assert_eq!(Equal.reverse(), Equal);
+    assert_eq!(Greater.reverse(), Less);
+}
+
+#[test]
+fn test_ordering_order() {
+    assert!(Less < Equal);
+    assert_eq!(Greater.cmp(&Less), Greater);
+}
+
+#[test]
+fn test_ordering_then() {
+    assert_eq!(Equal.then(Less), Less);
+    assert_eq!(Equal.then(Equal), Equal);
+    assert_eq!(Equal.then(Greater), Greater);
+    assert_eq!(Less.then(Less), Less);
+    assert_eq!(Less.then(Equal), Less);
+    assert_eq!(Less.then(Greater), Less);
+    assert_eq!(Greater.then(Less), Greater);
+    assert_eq!(Greater.then(Equal), Greater);
+    assert_eq!(Greater.then(Greater), Greater);
+}
+
+#[test]
+fn test_ordering_then_with() {
+    assert_eq!(Equal.then_with(|| Less), Less);
+    assert_eq!(Equal.then_with(|| Equal), Equal);
+    assert_eq!(Equal.then_with(|| Greater), Greater);
+    assert_eq!(Less.then_with(|| Less), Less);
+    assert_eq!(Less.then_with(|| Equal), Less);
+    assert_eq!(Less.then_with(|| Greater), Less);
+    assert_eq!(Greater.then_with(|| Less), Greater);
+    assert_eq!(Greater.then_with(|| Equal), Greater);
+    assert_eq!(Greater.then_with(|| Greater), Greater);
+}
+
+#[test]
+fn test_user_defined_eq() {
+    // Our type.
+    struct SketchyNum {
+        num: isize,
+    }
+
+    // Our implementation of `PartialEq` to support `==` and `!=`.
+    impl PartialEq for SketchyNum {
+        // Our custom eq allows numbers which are near each other to be equal! :D
+        fn eq(&self, other: &SketchyNum) -> bool {
+            (self.num - other.num).abs() < 5
+        }
+    }
+
+    // Now these binary operators will work when applied!
+    assert!(SketchyNum { num: 37 } == SketchyNum { num: 34 });
+    assert!(SketchyNum { num: 25 } != SketchyNum { num: 57 });
+}