diff --git a/src/tests/mat.rs b/src/tests/mat.rs
index 45124236..fca18dd0 100644
--- a/src/tests/mat.rs
+++ b/src/tests/mat.rs
@@ -1,5 +1,5 @@
 #[test]
-use core::num::{One};
+use core::num::{One, abs};
 #[test]
 use core::rand::{random};
 #[test]
@@ -9,11 +9,17 @@ use std::cmp::FuzzyEq;
 #[test]
 use traits::inv::Inv;
 #[test]
+use traits::rotation::Rotation;
+#[test]
+use dim1::vec1::vec1;
+#[test]
 use dim1::mat1::Mat1;
 #[test]
 use dim2::mat2::Mat2;
 #[test]
 use dim3::mat3::Mat3;
+#[test]
+use adaptors::rotmat::Rotmat;
 // #[test]
 // use traits::dim::d7;
 
@@ -60,6 +66,13 @@ fn test_inv_mat3()
 }
 
 #[test]
-fn test_rot2()
+fn test_rotation2()
 {
+  for uint::range(0u, 10000u) |_|
+  {
+    let randmat = One::one::<Rotmat<Mat2<f64>>>();
+    let ang     = &vec1(abs::<f64>(random()) % f64::consts::pi);
+
+    assert!(randmat.rotated(ang).rotation().fuzzy_eq(ang));
+  }
 }