diff --git a/src/liballoc/tests/btree/set.rs b/src/liballoc/tests/btree/set.rs
index 989beb3b1bfd90afbfd55626953080d31016bb39..8c3dacd914f39947e549c6a7095ffe5a0ccfaebe 100644
--- a/src/liballoc/tests/btree/set.rs
+++ b/src/liballoc/tests/btree/set.rs
@@ -10,7 +10,7 @@ fn test_clone_eq() {
     m.insert(1);
     m.insert(2);
 
-    assert!(m.clone() == m);
+    assert_eq!(m.clone(), m);
 }
 
 #[test]
@@ -28,7 +28,7 @@ fn test_hash() {
     y.insert(2);
     y.insert(1);
 
-    assert!(hash(&x) == hash(&y));
+    assert_eq!(hash(&x), hash(&y));
 }
 
 fn check<F>(a: &[i32], b: &[i32], expected: &[i32], f: F)
diff --git a/src/libcore/tests/slice.rs b/src/libcore/tests/slice.rs
index 1ef77f87ab7e2cc712e928ed33ef04092043daad..64366aa7401eefeb49eb6e8564fc674de6182849 100644
--- a/src/libcore/tests/slice.rs
+++ b/src/libcore/tests/slice.rs
@@ -3,19 +3,19 @@
 #[test]
 fn test_position() {
     let b = [1, 2, 3, 5, 5];
-    assert!(b.iter().position(|&v| v == 9) == None);
-    assert!(b.iter().position(|&v| v == 5) == Some(3));
-    assert!(b.iter().position(|&v| v == 3) == Some(2));
-    assert!(b.iter().position(|&v| v == 0) == None);
+    assert_eq!(b.iter().position(|&v| v == 9), None);
+    assert_eq!(b.iter().position(|&v| v == 5), Some(3));
+    assert_eq!(b.iter().position(|&v| v == 3), Some(2));
+    assert_eq!(b.iter().position(|&v| v == 0), None);
 }
 
 #[test]
 fn test_rposition() {
     let b = [1, 2, 3, 5, 5];
-    assert!(b.iter().rposition(|&v| v == 9) == None);
-    assert!(b.iter().rposition(|&v| v == 5) == Some(4));
-    assert!(b.iter().rposition(|&v| v == 3) == Some(2));
-    assert!(b.iter().rposition(|&v| v == 0) == None);
+    assert_eq!(b.iter().rposition(|&v| v == 9), None);
+    assert_eq!(b.iter().rposition(|&v| v == 5), Some(4));
+    assert_eq!(b.iter().rposition(|&v| v == 3), Some(2));
+    assert_eq!(b.iter().rposition(|&v| v == 0), None);
 }
 
 #[test]
diff --git a/src/libcore/tests/time.rs b/src/libcore/tests/time.rs
index 6efd22572dc185d57fe9b06062cfccd93754e48a..fac70c468c89d77cf6db8e778e76662e5cfb2d04 100644
--- a/src/libcore/tests/time.rs
+++ b/src/libcore/tests/time.rs
@@ -2,7 +2,7 @@
 
 #[test]
 fn creation() {
-    assert!(Duration::from_secs(1) != Duration::from_secs(0));
+    assert_ne!(Duration::from_secs(1), Duration::from_secs(0));
     assert_eq!(Duration::from_secs(1) + Duration::from_secs(2),
                Duration::from_secs(3));
     assert_eq!(Duration::from_millis(10) + Duration::from_secs(4),