1 files changed, 19 insertions, 0 deletions
diff --git a/spec/ruby/library/set/merge_spec.rb b/spec/ruby/library/set/merge_spec.rb
new file mode 100644
index 0000000000..ecee51b951
--- /dev/null
+++ b/spec/ruby/library/set/merge_spec.rb
@@ -0,0 +1,19 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+require 'set'
+
+describe "Set#merge" do
+  it "adds the elements of the passed Enumerable to self" do
+    Set[:a, :b].merge(Set[:b, :c, :d]).should == Set[:a, :b, :c, :d]
+    Set[1, 2].merge([3, 4]).should == Set[1, 2, 3, 4]
+  end
+
+  it "returns self" do
+    set = Set[1, 2]
+    set.merge([3, 4]).should equal(set)
+  end
+
+  it "raises an ArgumentError when passed a non-Enumerable" do
+    lambda { Set[1, 2].merge(1) }.should raise_error(ArgumentError)
+    lambda { Set[1, 2].merge(Object.new) }.should raise_error(ArgumentError)
+  end
+end