1 files changed, 33 insertions, 0 deletions
diff --git a/spec/ruby/core/objectspace/weakkeymap/key_spec.rb b/spec/ruby/core/objectspace/weakkeymap/key_spec.rb
new file mode 100644
index 0000000000..2af9c2b8e7
--- /dev/null
+++ b/spec/ruby/core/objectspace/weakkeymap/key_spec.rb
@@ -0,0 +1,33 @@
+require_relative '../../../spec_helper'
+
+ruby_version_is "3.3" do
+  describe "ObjectSpace::WeakKeyMap#key?" do
+    it "recognizes keys in use" do
+      map = ObjectSpace::WeakKeyMap.new
+      key1, key2 = %w[a b].map(&:upcase)
+      ref1, ref2 = %w[x y]
+
+      map[key1] = ref1
+      map.key?(key1).should == true
+      map[key1] = ref1
+      map.key?(key1).should == true
+      map[key2] = ref2
+      map.key?(key2).should == true
+    end
+
+    it "matches using equality semantics" do
+      map = ObjectSpace::WeakKeyMap.new
+      key1, key2 = %w[a a].map(&:upcase)
+      ref = "x"
+      map[key1] = ref
+      map.key?(key2).should == true
+    end
+
+    it "reports true if the pair exists and the value is nil" do
+      map = ObjectSpace::WeakKeyMap.new
+      key = Object.new
+      map[key] = nil
+      map.key?(key).should == true
+    end
+  end
+end