diff --git a/test/matrix/test_matrix.rb b/test/matrix/test_matrix.rb
index d73cbb5..9fa04c7 100644
--- a/test/matrix/test_matrix.rb
+++ b/test/matrix/test_matrix.rb
@@ -398,6 +398,10 @@ class TestMatrix < Test::Unit::TestCase
     assert_equal(Matrix[[1, 0, 0], [1, 2, 3]], @c1.real)
   end
 
+  def test_imaginary
+    assert_equal(Matrix[[2, 1, 0], [0, 0, 0]], @c1.imaginary)
+  end
+
   def test_row_vectors
     assert_equal([Vector[1,2,3], Vector[4,5,6]], @m1.row_vectors)
   end