1 files changed, 21 insertions, 0 deletions
diff --git a/spec/ruby/core/numeric/modulo_spec.rb b/spec/ruby/core/numeric/modulo_spec.rb
new file mode 100644
index 0000000000..0baf96dc18
--- /dev/null
+++ b/spec/ruby/core/numeric/modulo_spec.rb
@@ -0,0 +1,21 @@
+require_relative '../../spec_helper'
+
+describe "Numeric#modulo" do
+  it "is an alias of Numeric#%" do
+    Numeric.instance_method(:modulo).should == Numeric.instance_method(:%)
+  end
+end
+
+describe "Numeric#%" do
+  it "returns self - other * self.div(other)" do
+    s = mock_numeric('self')
+    o = mock_numeric('other')
+    n3 = mock_numeric('n3')
+    n4 = mock_numeric('n4')
+    n5 = mock_numeric('n5')
+    s.should_receive(:div).with(o).and_return(n3)
+    o.should_receive(:*).with(n3).and_return(n4)
+    s.should_receive(:-).with(n4).and_return(n5)
+    (s % o).should == n5
+  end
+end