diff --git a/tests/test.rs b/tests/test.rs
index 51227c5..c4a1728 100644
--- a/tests/test.rs
+++ b/tests/test.rs
@@ -906,34 +906,32 @@ fn test_parse_f64() {
     ]);
 }
 
-// test roundtrip with some values that failed with the old version of the f64 deserializer
+// Test roundtrip with some values that were not perfectly roundtripped by the
+// old f64 deserializer.
 #[test]
 fn test_roundtrip_f64() {
-    let roundtrip = |input: &f64| {
-        let json = serde_json::to_string(input).unwrap();
-        let output: f64 = serde_json::from_str(&json).unwrap();
-        assert_eq!(input, &output);
-    };
-
-    [
-        // samples from quickcheck-ing `roundtrip` with `input: f64`
-        // comments on the right showed the value returned by the old deserializer
+    for &float in &[
+        // Samples from quickcheck-ing roundtrip with `input: f64`. Comments
+        // indicate the value returned by the old deserializer.
         51.24817837550540_4,  // 51.2481783755054_1
         -93.3113703768803_3,  // -93.3113703768803_2
         -36.5739948427534_36, // -36.5739948427534_4
         52.31400820410624_4,  // 52.31400820410624_
         97.45365320034685,    // 97.4536532003468_4
-        // samples from `rng.next_u64` + `f64::from_bits` + `is_finite` filter
+        // Samples from `rng.next_u64` + `f64::from_bits` + `is_finite` filter.
         2.0030397744267762e-253,
         7.101215824554616e260,
         1.769268377902049e74,
         -1.6727517818542075e58,
         3.9287532173373315e299,
-        // edge case from https://github.com/serde-rs/json/issues/536#issuecomment-583714900
+        // Edge case from:
+        // https://github.com/serde-rs/json/issues/536#issuecomment-583714900
         2.638344616030823e-256,
-    ]
-    .iter()
-    .for_each(roundtrip);
+    ] {
+        let json = serde_json::to_string(&float).unwrap();
+        let output: f64 = serde_json::from_str(&json).unwrap();
+        assert_eq!(float, output);
+    }
 }
 
 #[test]