2 files changed, 35 insertions, 0 deletions
diff --git a/spec/ruby/core/enumerable/fixtures/classes.rb b/spec/ruby/core/enumerable/fixtures/classes.rb
index fb4951c6e6..2701c6999c 100644
--- a/spec/ruby/core/enumerable/fixtures/classes.rb
+++ b/spec/ruby/core/enumerable/fixtures/classes.rb
@@ -342,4 +342,10 @@ module EnumerableSpecs
       @block.call(*args)
     end
   end
+
+  # Set is a core class since Ruby 3.2
+  ruby_version_is '3.2' do
+    class SetSubclass < Set
+    end
+  end
 end # EnumerableSpecs utility classes
diff --git a/spec/ruby/core/enumerable/to_set_spec.rb b/spec/ruby/core/enumerable/to_set_spec.rb
new file mode 100644
index 0000000000..c21a2772c4
--- /dev/null
+++ b/spec/ruby/core/enumerable/to_set_spec.rb
@@ -0,0 +1,29 @@
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
+
+ruby_version_is "3.2" do
+  describe "Enumerable#to_set" do
+    it "returns a new Set created from self" do
+      [1, 2, 3].to_set.should == Set[1, 2, 3]
+      {a: 1, b: 2}.to_set.should == Set[[:b, 2], [:a, 1]]
+    end
+
+    it "passes down passed blocks" do
+      [1, 2, 3].to_set { |x| x * x }.should == Set[1, 4, 9]
+    end
+
+    it "instantiates an object of provided as the first argument set class" do
+      set = [1, 2, 3].to_set(EnumerableSpecs::SetSubclass)
+      set.should be_kind_of(EnumerableSpecs::SetSubclass)
+      set.to_a.sort.should == [1, 2, 3]
+    end
+
+    it "does not need explicit `require 'set'`" do
+      output = ruby_exe(<<~RUBY, options: '--disable-gems', args: '2>&1')
+        puts [1, 2, 3].to_set
+      RUBY
+
+      output.chomp.should == "#<Set: {1, 2, 3}>"
+    end
+  end
+end