1 files changed, 32 insertions, 0 deletions
diff --git a/spec/ruby/core/module/private_constant_spec.rb b/spec/ruby/core/module/private_constant_spec.rb
new file mode 100644
index 0000000000..ca0df48c0b
--- /dev/null
+++ b/spec/ruby/core/module/private_constant_spec.rb
@@ -0,0 +1,32 @@
+require_relative '../../spec_helper'
+
+describe "Module#private_constant" do
+  it "can only be passed constant names defined in the target (self) module" do
+    cls1 = Class.new
+    cls1.const_set :Foo, true
+    cls2 = Class.new(cls1)
+
+    -> do
+      cls2.send :private_constant, :Foo
+    end.should.raise(NameError)
+  end
+
+  it "accepts strings as constant names" do
+    cls = Class.new
+    cls.const_set :Foo, true
+    cls.send :private_constant, "Foo"
+
+    -> { cls::Foo }.should.raise(NameError)
+  end
+
+  it "accepts multiple names" do
+    mod = Module.new
+    mod.const_set :Foo, true
+    mod.const_set :Bar, true
+
+    mod.send :private_constant, :Foo, :Bar
+
+    -> {mod::Foo}.should.raise(NameError)
+    -> {mod::Bar}.should.raise(NameError)
+  end
+end