Add tests for {f32,f64}::round_to_even() functions

rust-lang · Feb 18, 2021 · 68074e0 · 68074e0
1 parent 396a286
commit 68074e0
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diff --git a/library/std/src/f32/tests.rs b/library/std/src/f32/tests.rs
@@ -201,12 +201,30 @@ fn test_round() {
     assert_approx_eq!(1.3f32.round(), 1.0f32);
     assert_approx_eq!(1.5f32.round(), 2.0f32);
     assert_approx_eq!(1.7f32.round(), 2.0f32);
+    assert_approx_eq!(2.5f32.round(), 3.0f32);
     assert_approx_eq!(0.0f32.round(), 0.0f32);
     assert_approx_eq!((-0.0f32).round(), -0.0f32);
     assert_approx_eq!((-1.0f32).round(), -1.0f32);
     assert_approx_eq!((-1.3f32).round(), -1.0f32);
     assert_approx_eq!((-1.5f32).round(), -2.0f32);
     assert_approx_eq!((-1.7f32).round(), -2.0f32);
+    assert_approx_eq!((-2.5f32).round(), -3.0f32);
+}
+
+#[test]
+fn test_round_to_even() {
+    assert_approx_eq!(1.0f32.round_to_even(), 1.0f32);
+    assert_approx_eq!(1.3f32.round_to_even(), 1.0f32);
+    assert_approx_eq!(1.5f32.round_to_even(), 2.0f32);
+    assert_approx_eq!(1.7f32.round_to_even(), 2.0f32);
+    assert_approx_eq!(2.5f32.round_to_even(), 2.0f32);
+    assert_approx_eq!(0.0f32.round_to_even(), 0.0f32);
+    assert_approx_eq!((-0.0f32).round_to_even(), -0.0f32);
+    assert_approx_eq!((-1.0f32).round_to_even(), -1.0f32);
+    assert_approx_eq!((-1.3f32).round_to_even(), -1.0f32);
+    assert_approx_eq!((-1.5f32).round_to_even(), -2.0f32);
+    assert_approx_eq!((-1.7f32).round_to_even(), -2.0f32);
+    assert_approx_eq!((-2.5f32).round_to_even(), -2.0f32);
 }
 
 #[test]

diff --git a/library/std/src/f64/tests.rs b/library/std/src/f64/tests.rs
@@ -203,12 +203,30 @@ fn test_round() {
     assert_approx_eq!(1.3f64.round(), 1.0f64);
     assert_approx_eq!(1.5f64.round(), 2.0f64);
     assert_approx_eq!(1.7f64.round(), 2.0f64);
+    assert_approx_eq!(2.5f64.round(), 3.0f64);
     assert_approx_eq!(0.0f64.round(), 0.0f64);
     assert_approx_eq!((-0.0f64).round(), -0.0f64);
     assert_approx_eq!((-1.0f64).round(), -1.0f64);
     assert_approx_eq!((-1.3f64).round(), -1.0f64);
     assert_approx_eq!((-1.5f64).round(), -2.0f64);
     assert_approx_eq!((-1.7f64).round(), -2.0f64);
+    assert_approx_eq!((-2.5f64).round(), -3.0f64);
+}
+
+#[test]
+fn test_round_to_even() {
+    assert_approx_eq!(1.0f64.round_to_even(), 1.0f64);
+    assert_approx_eq!(1.3f64.round_to_even(), 1.0f64);
+    assert_approx_eq!(1.5f64.round_to_even(), 2.0f64);
+    assert_approx_eq!(1.7f64.round_to_even(), 2.0f64);
+    assert_approx_eq!(2.5f64.round_to_even(), 2.0f64);
+    assert_approx_eq!(0.0f64.round_to_even(), 0.0f64);
+    assert_approx_eq!((-0.0f64).round_to_even(), -0.0f64);
+    assert_approx_eq!((-1.0f64).round_to_even(), -1.0f64);
+    assert_approx_eq!((-1.3f64).round_to_even(), -1.0f64);
+    assert_approx_eq!((-1.5f64).round_to_even(), -2.0f64);
+    assert_approx_eq!((-1.7f64).round_to_even(), -2.0f64);
+    assert_approx_eq!((-2.5f64).round_to_even(), -2.0f64);
 }
 
 #[test]

diff --git a/library/std/src/lib.rs b/library/std/src/lib.rs
@@ -302,6 +302,7 @@
 #![feature(ptr_internals)]
 #![feature(raw)]
 #![feature(ready_macro)]
+#![cfg_attr(not(bootstrap), feature(round_to_even))]
 #![feature(rustc_attrs)]
 #![feature(rustc_private)]
 #![feature(shrink_to)]