1 files changed, 29 insertions, 0 deletions
diff --git a/spec/ruby/library/set/join_spec.rb b/spec/ruby/library/set/join_spec.rb
new file mode 100644
index 0000000000..3f511a84e4
--- /dev/null
+++ b/spec/ruby/library/set/join_spec.rb
@@ -0,0 +1,29 @@
+require_relative '../../spec_helper'
+require 'set'
+
+describe "Set#join" do
+  it "returns an empty string if the Set is empty" do
+    Set[].join.should == ''
+  end
+
+  it "returns a new string formed by joining elements after conversion" do
+    set = Set[:a, :b, :c]
+    set.join.should == "abc"
+  end
+
+  it "does not separate elements when the passed separator is nil" do
+    set = Set[:a, :b, :c]
+    set.join(nil).should == "abc"
+  end
+
+  it "returns a string formed by concatenating each element separated by the separator" do
+    set = Set[:a, :b, :c]
+    set.join(' | ').should == "a | b | c"
+  end
+
+  it "calls #to_a to convert the Set in to an Array" do
+    set = Set[:a, :b, :c]
+    set.should_receive(:to_a).and_return([:a, :b, :c])
+    set.join.should == "abc"
+  end
+end