1 files changed, 13 insertions, 0 deletions
diff --git a/spec/ruby/core/complex/negative_spec.rb b/spec/ruby/core/complex/negative_spec.rb
new file mode 100644
index 0000000000..62ab89c04a
--- /dev/null
+++ b/spec/ruby/core/complex/negative_spec.rb
@@ -0,0 +1,13 @@
+require_relative '../../spec_helper'
+
+describe "Complex#negative?" do
+  it "is undefined" do
+    c = Complex(1)
+
+    c.methods.should_not include(:negative?)
+
+    -> {
+      c.negative?
+    }.should raise_error(NoMethodError)
+  end
+end