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..052755b73b
--- /dev/null
+++ b/spec/ruby/core/module/singleton_class_spec.rb
@@ -0,0 +1,27 @@
+require_relative '../../spec_helper'
+
+describe "Module#singleton_class?" do
+  it "returns true for singleton classes" do
+    xs = self.singleton_class
+    xs.should.singleton_class?
+  end
+
+  it "returns false for other classes" do
+    c = Class.new
+    c.should_not.singleton_class?
+  end
+
+  describe "with singleton values" do
+    it "returns false for nil's singleton class" do
+      NilClass.should_not.singleton_class?
+    end
+
+    it "returns false for true's singleton class" do
+      TrueClass.should_not.singleton_class?
+    end
+
+    it "returns false for false's singleton class" do
+      FalseClass.should_not.singleton_class?
+    end
+  end
+end