1 files changed, 25 insertions, 0 deletions
diff --git a/spec/ruby/core/complex/comparison_spec.rb b/spec/ruby/core/complex/comparison_spec.rb
new file mode 100644
index 0000000000..3115f4e205
--- /dev/null
+++ b/spec/ruby/core/complex/comparison_spec.rb
@@ -0,0 +1,25 @@
+require_relative '../../spec_helper'
+
+describe "Complex#<=>" do
+  it "returns nil if either self or argument has imaginary part" do
+    (Complex(5, 1) <=> Complex(2)).should == nil
+    (Complex(1) <=> Complex(2, 1)).should == nil
+    (5 <=> Complex(2, 1)).should == nil
+  end
+
+  it "returns nil if argument is not numeric" do
+    (Complex(5, 1) <=> "cmp").should == nil
+    (Complex(1) <=> "cmp").should == nil
+    (Complex(1) <=> Object.new).should == nil
+  end
+
+  it "returns 0, 1, or -1 if self and argument do not have imaginary part" do
+    (Complex(5) <=> Complex(2)).should == 1
+    (Complex(2) <=> Complex(3)).should == -1
+    (Complex(2) <=> Complex(2)).should == 0
+
+    (Complex(5) <=> 2).should == 1
+    (Complex(2) <=> 3).should == -1
+    (Complex(2) <=> 2).should == 0
+  end
+end