diff --git a/src/hyperfine/internal.rs b/src/hyperfine/internal.rs
index 7f1355d..ce47b48 100644
--- a/src/hyperfine/internal.rs
+++ b/src/hyperfine/internal.rs
@@ -96,3 +96,12 @@ pub fn min(vals: &[f64]) -> f64 {
         .unwrap()
         .clone()
 }
+
+#[test]
+fn test_max() {
+    assert_eq!(1.0, max(&[1.0]));
+    assert_eq!(-1.0, max(&[-1.0]));
+    assert_eq!(-1.0, max(&[-2.0, -1.0]));
+    assert_eq!(1.0, max(&[-1.0, 1.0]));
+    assert_eq!(1.0, max(&[-1.0, 1.0, 0.0]));
+}