1 files changed, 80 insertions, 0 deletions
diff --git a/spec/ruby/shared/kernel/object_id.rb b/spec/ruby/shared/kernel/object_id.rb
new file mode 100644
index 0000000000..7acdb27554
--- /dev/null
+++ b/spec/ruby/shared/kernel/object_id.rb
@@ -0,0 +1,80 @@
+# These examples hold for both BasicObject#__id__ and Kernel#object_id.
+describe :object_id, shared: true do
+  it "returns an integer" do
+    o1 = @object.new
+    o1.__send__(@method).should be_kind_of(Integer)
+  end
+
+  it "returns the same value on all calls to id for a given object" do
+    o1 = @object.new
+    o1.__send__(@method).should == o1.__send__(@method)
+  end
+
+  it "returns different values for different objects" do
+    o1 = @object.new
+    o2 = @object.new
+    o1.__send__(@method).should_not == o2.__send__(@method)
+  end
+
+  it "returns the same value for two Fixnums with the same value" do
+    o1 = 1
+    o2 = 1
+    o1.send(@method).should == o2.send(@method)
+  end
+
+  it "returns the same value for two Symbol literals" do
+    o1 = :hello
+    o2 = :hello
+    o1.send(@method).should == o2.send(@method)
+  end
+
+  it "returns the same value for two true literals" do
+    o1 = true
+    o2 = true
+    o1.send(@method).should == o2.send(@method)
+  end
+
+  it "returns the same value for two false literals" do
+    o1 = false
+    o2 = false
+    o1.send(@method).should == o2.send(@method)
+  end
+
+  it "returns the same value for two nil literals" do
+    o1 = nil
+    o2 = nil
+    o1.send(@method).should == o2.send(@method)
+  end
+
+  it "returns a different value for two Bignum literals" do
+    o1 = 2e100.to_i
+    o2 = 2e100.to_i
+    o1.send(@method).should_not == o2.send(@method)
+  end
+
+  it "returns a different value for two String literals" do
+    o1 = "hello"
+    o2 = "hello"
+    o1.send(@method).should_not == o2.send(@method)
+  end
+
+  it "returns a different value for an object and its dup" do
+    o1 = mock("object")
+    o2 = o1.dup
+    o1.send(@method).should_not == o2.send(@method)
+  end
+
+  it "returns a different value for two numbers near the 32 bit Fixnum limit" do
+    o1 = -1
+    o2 = 2 ** 30 - 1
+
+    o1.send(@method).should_not == o2.send(@method)
+  end
+
+  it "returns a different value for two numbers near the 64 bit Fixnum limit" do
+    o1 = -1
+    o2 = 2 ** 62 - 1
+
+    o1.send(@method).should_not == o2.send(@method)
+  end
+end