1 files changed, 47 insertions, 0 deletions
diff --git a/spec/ruby/core/set/to_s_spec.rb b/spec/ruby/core/set/to_s_spec.rb
new file mode 100644
index 0000000000..7f768bdcbf
--- /dev/null
+++ b/spec/ruby/core/set/to_s_spec.rb
@@ -0,0 +1,47 @@
+require_relative "../../spec_helper"
+
+describe "Set#to_s" do
+  it "returns a String representation of self" do
+    Set[].to_s.should.is_a?(String)
+    Set[nil, false, true].to_s.should.is_a?(String)
+    Set[1, 2, 3].to_s.should.is_a?(String)
+    Set["1", "2", "3"].to_s.should.is_a?(String)
+    Set[:a, "b", Set[?c]].to_s.should.is_a?(String)
+  end
+
+  ruby_version_is "4.0" do
+    it "does include the elements of the set" do
+      Set["1"].to_s.should == 'Set["1"]'
+    end
+  end
+
+  ruby_version_is ""..."4.0" do
+    it "does include the elements of the set" do
+      Set["1"].to_s.should == '#<Set: {"1"}>'
+    end
+  end
+
+  it "puts spaces between the elements" do
+    Set["1", "2"].to_s.should.include?('", "')
+  end
+
+  ruby_version_is "4.0" do
+    it "correctly handles cyclic-references" do
+      set1 = Set[]
+      set2 = Set[set1]
+      set1 << set2
+      set1.to_s.should.is_a?(String)
+      set1.to_s.should.include?("Set[...]")
+    end
+  end
+
+  ruby_version_is ""..."4.0" do
+    it "correctly handles cyclic-references" do
+      set1 = Set[]
+      set2 = Set[set1]
+      set1 << set2
+      set1.to_s.should.is_a?(String)
+      set1.to_s.should.include?("#<Set: {...}>")
+    end
+  end
+end