1 files changed, 28 insertions, 2 deletions
diff --git a/spec/ruby/core/objectspace/weakmap/include_spec.rb b/spec/ruby/core/objectspace/weakmap/include_spec.rb
index 54ca6b3030..1affaef907 100644
--- a/spec/ruby/core/objectspace/weakmap/include_spec.rb
+++ b/spec/ruby/core/objectspace/weakmap/include_spec.rb
@@ -1,6 +1,32 @@
 require_relative '../../../spec_helper'
-require_relative 'shared/include'
 
 describe "ObjectSpace::WeakMap#include?" do
-  it_behaves_like :weakmap_include?, :include?
+  it "recognizes keys in use" do
+    map = ObjectSpace::WeakMap.new
+    key1, key2 = %w[a b].map(&:upcase)
+    ref1, ref2 = %w[x y]
+
+    map[key1] = ref1
+    map.include?(key1).should == true
+    map[key1] = ref1
+    map.include?(key1).should == true
+    map[key2] = ref2
+    map.include?(key2).should == true
+  end
+
+  it "matches using identity semantics" do
+    map = ObjectSpace::WeakMap.new
+    key1, key2 = %w[a a].map(&:upcase)
+    ref = "x"
+    map[key1] = ref
+    map.include?(key2).should == false
+  end
+
+  it "reports true if the pair exists and the value is nil" do
+    map = ObjectSpace::WeakMap.new
+    key = Object.new
+    map[key] = nil
+    map.size.should == 1
+    map.include?(key).should == true
+  end
 end