1 files changed, 57 insertions, 0 deletions
diff --git a/test/psych/test_psych_set.rb b/test/psych/test_psych_set.rb
new file mode 100644
index 0000000000..c72cd73f18
--- /dev/null
+++ b/test/psych/test_psych_set.rb
@@ -0,0 +1,57 @@
+# frozen_string_literal: true
+require_relative 'helper'
+
+module Psych
+  class TestPsychSet < TestCase
+    def setup
+      super
+      @set = Psych::Set.new
+      @set['foo'] = 'bar'
+      @set['bar'] = 'baz'
+    end
+
+    def test_dump
+      assert_match(/!set/, Psych.dump(@set))
+    end
+
+    def test_roundtrip
+      assert_cycle(@set)
+    end
+
+    ###
+    # FIXME: Syck should also support !!set as shorthand
+    def test_load_from_yaml
+      loaded = Psych.unsafe_load(<<-eoyml)
+--- !set
+foo: bar
+bar: baz
+      eoyml
+      assert_equal(@set, loaded)
+    end
+
+    def test_loaded_class
+      assert_instance_of(Psych::Set, Psych.unsafe_load(Psych.dump(@set)))
+    end
+
+    def test_set_shorthand
+      loaded = Psych.unsafe_load(<<-eoyml)
+--- !!set
+foo: bar
+bar: baz
+      eoyml
+      assert_instance_of(Psych::Set, loaded)
+    end
+
+    def test_set_self_reference
+      @set['self'] = @set
+      assert_cycle(@set)
+    end
+
+    def test_stringify_names
+      @set[:symbol] = :value
+
+      assert_match(/^:symbol: :value/, Psych.dump(@set))
+      assert_match(/^symbol: :value/, Psych.dump(@set, stringify_names: true))
+    end
+  end
+end