diff --git a/.travis.yml b/.travis.yml
new file mode 100644
index 0000000..b177ce6
--- /dev/null
+++ b/.travis.yml
@@ -0,0 +1,6 @@
+language: rust
+sudo: false
+
+script:
+  - cargo build
+  - cargo test
diff --git a/src/length.rs b/src/length.rs
index 393df56..6eda0c0 100644
--- a/src/length.rs
+++ b/src/length.rs
@@ -122,7 +122,7 @@ impl<Unit, T: Zero> Zero for Length<Unit, T> {
 mod tests {
     use super::Length;
     use scale_factor::ScaleFactor;
-    use std::num::Zero;
+    use num::Zero;
 
     #[derive(Debug)]
     enum Inch {}
@@ -139,7 +139,7 @@ mod tests {
 
         assert_eq!(one_foot.get(), 12.0);
         assert_eq!(two_feet.get(), 24.0);
-        assert!(zero_feet.is_zero());
+        assert_eq!(zero_feet.get(), 0.0);
 
         assert!(one_foot == one_foot);
         assert!(two_feet != one_foot);
diff --git a/src/matrix.rs b/src/matrix.rs
index b09b44d..fa404c5 100644
--- a/src/matrix.rs
+++ b/src/matrix.rs
@@ -141,7 +141,7 @@ pub fn test_ortho() {
                            0.0,  2.22222222,  0.0,  0.0,
                            0.0,  0.0,         -1.0, 0.0,
                            -1.0, -1.22222222, -0.0, 1.0);
-    debug!("result={} expected={}", result, expected);
+    debug!("result={:?} expected={:?}", result, expected);
     assert!(result.approx_eq(&expected));
 }
 
diff --git a/src/side_offsets.rs b/src/side_offsets.rs
index c359356..66ce2de 100644
--- a/src/side_offsets.rs
+++ b/src/side_offsets.rs
@@ -159,7 +159,7 @@ impl SideOffsets2DSimdI32 {
 
 #[cfg(test)]
 mod tests {
-    use std::num::Zero;
+    use num::Zero;
     use super::SideOffsets2DSimdI32;
 
     #[test]