diff --git a/src/link/mod.rs b/src/link/mod.rs
index b761827..87d8533 100644
--- a/src/link/mod.rs
+++ b/src/link/mod.rs
@@ -172,27 +172,27 @@ fn message_push_byte() {
     reader.push_byte(0).unwrap();
     reader.push_byte(0).unwrap();
     reader.push_byte(13).unwrap();
-    reader.push_byte(0x48).unwrap(); // H
-    reader.push_byte(0x65).unwrap(); // e
-    reader.push_byte(0x6c).unwrap(); // l
-    reader.push_byte(0x6c).unwrap(); // l
-    reader.push_byte(0x6f).unwrap(); // o
-    reader.push_byte(0x2c).unwrap(); // ,
-    reader.push_byte(0x20).unwrap(); // <space>
-    reader.push_byte(0x77).unwrap(); // w
-    reader.push_byte(0x6f).unwrap(); // o
-    reader.push_byte(0x72).unwrap(); // r
-    reader.push_byte(0x6c).unwrap(); // l
-    reader.push_byte(0x64).unwrap(); // d
-    reader.push_byte(0x21).unwrap(); // <exclamation mark>
+    reader.push_byte(b'H').unwrap();
+    reader.push_byte(b'e').unwrap();
+    reader.push_byte(b'l').unwrap();
+    reader.push_byte(b'l').unwrap();
+    reader.push_byte(b'o').unwrap();
+    reader.push_byte(b',').unwrap();
+    reader.push_byte(b' ').unwrap();
+    reader.push_byte(b'w').unwrap();
+    reader.push_byte(b'o').unwrap();
+    reader.push_byte(b'r').unwrap();
+    reader.push_byte(b'l').unwrap();
+    reader.push_byte(b'd').unwrap();
+    reader.push_byte(b'!').unwrap();
     reader.push_byte(HEAD_UE_MESSAGE).unwrap();
     reader.push_byte(0).unwrap();
     reader.push_byte(0).unwrap();
     reader.push_byte(0).unwrap();
     reader.push_byte(3).unwrap();
-    reader.push_byte(0x59).unwrap(); // Y
-    reader.push_byte(0x6f).unwrap(); // o
-    reader.push_byte(0x21).unwrap(); // <exclamation mark>
+    reader.push_byte(b'Y').unwrap();
+    reader.push_byte(b'o').unwrap();
+    reader.push_byte(b'!').unwrap();
     assert_eq!(reader.pop().unwrap(), "Hello, world!");
     assert_eq!(reader.pop().unwrap(), "Yo!");
     assert_eq!(reader.pop(), None);
@@ -233,9 +233,9 @@ fn mixed_push_byte() {
     reader.push_byte(0).unwrap();
     reader.push_byte(0).unwrap();
     reader.push_byte(3).unwrap();
-    reader.push_byte(0x59).unwrap(); // Y
-    reader.push_byte(0x6f).unwrap(); // o
-    reader.push_byte(0x21).unwrap(); // <exclamation mark>
+    reader.push_byte(b'Y').unwrap();
+    reader.push_byte(b'o').unwrap();
+    reader.push_byte(b'!').unwrap();
     reader.push_byte(HEAD_UE_RECEIVED).unwrap();
     reader.push_byte(65).unwrap();
     reader.push_byte(25).unwrap();
@@ -261,9 +261,9 @@ fn pushing_many_bytes_at_once() {
             0,
             0,
             3,
-            0x59, // Y
-            0x6f, // o
-            0x21, // <exclamation mark>
+            b'Y',
+            b'o',
+            b'!',
             HEAD_UE_RECEIVED,
             65,
             25,