1 files changed, 17 insertions, 0 deletions
diff --git a/spec/ruby/library/set/subtract_spec.rb b/spec/ruby/library/set/subtract_spec.rb
new file mode 100644
index 0000000000..b0889bb675
--- /dev/null
+++ b/spec/ruby/library/set/subtract_spec.rb
@@ -0,0 +1,17 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+require 'set'
+
+describe "Set#subtract" do
+  before :each do
+    @set = Set[:a, :b, :c]
+  end
+
+  it "deletes any elements contained in other and returns self" do
+    @set.subtract(Set[:b, :c]).should == @set
+    @set.should == Set[:a]
+  end
+
+  it "accepts any enumerable as other" do
+    @set.subtract([:c]).should == Set[:a, :b]
+  end
+end