1 files changed, 4 insertions, 0 deletions
diff --git a/test/test_cmath.rb b/test/test_cmath.rb
index 46a357fab2..4f85ec3d04 100644
--- a/test/test_cmath.rb
+++ b/test/test_cmath.rb
@@ -5,4 +5,8 @@ class TestCMath < Test::Unit::TestCase
   def test_sqrt
     assert_equal CMath.sqrt(1.0.i), CMath.sqrt(1.i), '[ruby-core:31672]'
   end
+
+  def test_cbrt_returns_principal_value_of_cube_root
+    assert_equal CMath.cbrt(-8), (-8)**(1.0/3), '#3676'
+  end
 end