A few lerp tests

1 files changed, 21 insertions, 0 deletions

diff --git a/library/std/src/f32/tests.rs b/library/std/src/f32/tests.rs
index 0d4b865f339..7b54bc23354 100644
--- a/library/std/src/f32/tests.rs
+++ b/library/std/src/f32/tests.rs
@@ -757,3 +757,24 @@ fn test_total_cmp() {
     assert_eq!(Ordering::Less, (-s_nan()).total_cmp(&f32::INFINITY));
     assert_eq!(Ordering::Less, (-s_nan()).total_cmp(&s_nan()));
 }
+
+#[test]
+fn test_lerp_exact() {
+    assert_eq!(f32::lerp(0.0, 2.0, 4.0), 2.0);
+    assert_eq!(f32::lerp(1.0, 2.0, 4.0), 4.0);
+    assert_eq!(f32::lerp(0.0, f32::MIN, f32::MAX), f32::MIN);
+    assert_eq!(f32::lerp(1.0, f32::MIN, f32::MAX), f32::MAX);
+}
+
+#[test]
+fn test_lerp_consistent() {
+    assert_eq!(f32::lerp(f32::MAX, f32::MIN, f32::MIN), f32::MIN);
+    assert_eq!(f32::lerp(f32::MIN, f32::MAX, f32::MAX), f32::MAX);
+}
+
+#[test]
+fn test_lerp_values() {
+    assert_eq!(f32::lerp(0.25, 1.0, 2.0), 1.25);
+    assert_eq!(f32::lerp(0.50, 1.0, 2.0), 1.50);
+    assert_eq!(f32::lerp(0.75, 1.0, 2.0), 1.75);
+}