Move libXtest into libX/tests

This change moves:

1. `libcoretest` into `libcore/tests`
2. `libcollectionstest` into `libcollections/tests`

This is a follow-up to #39561.

1 files changed, 68 insertions, 0 deletions

diff --git a/src/libcore/tests/tuple.rs b/src/libcore/tests/tuple.rs
new file mode 100644
index 00000000000..4fe5e0a740b
--- /dev/null
+++ b/src/libcore/tests/tuple.rs
@@ -0,0 +1,68 @@
+// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.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.
+
+use std::cmp::Ordering::{Equal, Less, Greater};
+
+#[test]
+fn test_clone() {
+    let a = (1, "2");
+    let b = a.clone();
+    assert_eq!(a, b);
+}
+
+#[test]
+fn test_tuple_cmp() {
+    let (small, big) = ((1, 2, 3), (3, 2, 1));
+
+    let nan = 0.0f64/0.0;
+
+    // PartialEq
+    assert_eq!(small, small);
+    assert_eq!(big, big);
+    assert!(small != big);
+    assert!(big != small);
+
+    // PartialOrd
+    assert!(small < big);
+    assert!(!(small < small));
+    assert!(!(big < small));
+    assert!(!(big < big));
+
+    assert!(small <= small);
+    assert!(big <= big);
+
+    assert!(big > small);
+    assert!(small >= small);
+    assert!(big >= small);
+    assert!(big >= big);
+
+    assert!(!((1.0f64, 2.0f64) < (nan, 3.0)));
+    assert!(!((1.0f64, 2.0f64) <= (nan, 3.0)));
+    assert!(!((1.0f64, 2.0f64) > (nan, 3.0)));
+    assert!(!((1.0f64, 2.0f64) >= (nan, 3.0)));
+    assert!(((1.0f64, 2.0f64) < (2.0, nan)));
+    assert!(!((2.0f64, 2.0f64) < (2.0, nan)));
+
+    // Ord
+    assert!(small.cmp(&small) == Equal);
+    assert!(big.cmp(&big) == Equal);
+    assert!(small.cmp(&big) == Less);
+    assert!(big.cmp(&small) == Greater);
+}
+
+#[test]
+fn test_show() {
+    let s = format!("{:?}", (1,));
+    assert_eq!(s, "(1,)");
+    let s = format!("{:?}", (1, true));
+    assert_eq!(s, "(1, true)");
+    let s = format!("{:?}", (1, "hi", true));
+    assert_eq!(s, "(1, \"hi\", true)");
+}