1 files changed, 27 insertions, 0 deletions
diff --git a/spec/ruby/core/module/singleton_class_spec.rb b/spec/ruby/core/module/singleton_class_spec.rb
new file mode 100644
index 0000000000..177dfc224f
--- /dev/null
+++ b/spec/ruby/core/module/singleton_class_spec.rb
@@ -0,0 +1,27 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "Module#singleton_class?" do
+  it "returns true for singleton classes" do
+    xs = self.singleton_class
+    xs.singleton_class?.should == true
+  end
+
+  it "returns false for other classes" do
+    c = Class.new
+    c.singleton_class?.should == false
+  end
+
+  describe "with singleton values" do
+    it "returns false for nil's singleton class" do
+      NilClass.singleton_class?.should == false
+    end
+
+    it "returns false for true's singleton class" do
+      TrueClass.singleton_class?.should == false
+    end
+
+    it "returns false for false's singleton class" do
+      FalseClass.singleton_class?.should == false
+    end
+  end
+end