1 files changed, 19 insertions, 0 deletions
diff --git a/spec/ruby/library/set/sortedset/merge_spec.rb b/spec/ruby/library/set/sortedset/merge_spec.rb
new file mode 100644
index 0000000000..31570ad4db
--- /dev/null
+++ b/spec/ruby/library/set/sortedset/merge_spec.rb
@@ -0,0 +1,19 @@
+require_relative '../../../spec_helper'
+require 'set'
+
+describe "SortedSet#merge" do
+  it "adds the elements of the passed Enumerable to self" do
+    SortedSet["a", "b"].merge(SortedSet["b", "c", "d"]).should == SortedSet["a", "b", "c", "d"]
+    SortedSet[1, 2].merge([3, 4]).should == SortedSet[1, 2, 3, 4]
+  end
+
+  it "returns self" do
+    set = SortedSet[1, 2]
+    set.merge([3, 4]).should equal(set)
+  end
+
+  it "raises an ArgumentError when passed a non-Enumerable" do
+    -> { SortedSet[1, 2].merge(1) }.should raise_error(ArgumentError)
+    -> { SortedSet[1, 2].merge(Object.new) }.should raise_error(ArgumentError)
+  end
+end