1 files changed, 38 insertions, 0 deletions
diff --git a/spec/ruby/core/hash/shared/key.rb b/spec/ruby/core/hash/shared/key.rb
new file mode 100644
index 0000000000..17f9f81457
--- /dev/null
+++ b/spec/ruby/core/hash/shared/key.rb
@@ -0,0 +1,38 @@
+describe :hash_key_p, shared: true do
+  it "returns true if argument is a key" do
+    h = { a: 1, b: 2, c: 3, 4 => 0 }
+    h.send(@method, :a).should == true
+    h.send(@method, :b).should == true
+    h.send(@method, 2).should == false
+    h.send(@method, 4).should == true
+
+    not_supported_on :opal do
+      h.send(@method, 'b').should == false
+      h.send(@method, 4.0).should == false
+    end
+  end
+
+  it "returns true if the key's matching value was nil" do
+    { xyz: nil }.send(@method, :xyz).should == true
+  end
+
+  it "returns true if the key's matching value was false" do
+    { xyz: false }.send(@method, :xyz).should == true
+  end
+
+  it "returns true if the key is nil" do
+    { nil => 'b' }.send(@method, nil).should == true
+    { nil => nil }.send(@method, nil).should == true
+  end
+
+  it "compares keys with the same #hash value via #eql?" do
+    x = mock('x')
+    x.stub!(:hash).and_return(42)
+
+    y = mock('y')
+    y.stub!(:hash).and_return(42)
+    y.should_receive(:eql?).and_return(false)
+
+    { x => nil }.send(@method, y).should == false
+  end
+end