1 files changed, 273 insertions, 0 deletions
diff --git a/spec/ruby/core/module/const_get_spec.rb b/spec/ruby/core/module/const_get_spec.rb
new file mode 100644
index 0000000000..4b53cbe7b3
--- /dev/null
+++ b/spec/ruby/core/module/const_get_spec.rb
@@ -0,0 +1,273 @@
+require_relative '../../spec_helper'
+require_relative '../../fixtures/constants'
+require_relative 'fixtures/constants_autoload'
+
+describe "Module#const_get" do
+  it "accepts a String or Symbol name" do
+    Object.const_get(:CS_CONST1).should == :const1
+    Object.const_get("CS_CONST1").should == :const1
+  end
+
+  it "raises a NameError if no constant is defined in the search path" do
+    -> { ConstantSpecs.const_get :CS_CONSTX }.should raise_error(NameError)
+  end
+
+  it "raises a NameError with the not found constant symbol" do
+    error_inspection = -> e { e.name.should == :CS_CONSTX }
+    -> { ConstantSpecs.const_get :CS_CONSTX }.should raise_error(NameError, &error_inspection)
+  end
+
+  it "raises a NameError if the name does not start with a capital letter" do
+    -> { ConstantSpecs.const_get "name" }.should raise_error(NameError)
+  end
+
+  it "raises a NameError if the name starts with a non-alphabetic character" do
+    -> { ConstantSpecs.const_get "__CONSTX__" }.should raise_error(NameError)
+    -> { ConstantSpecs.const_get "@CS_CONST1" }.should raise_error(NameError)
+    -> { ConstantSpecs.const_get "!CS_CONST1" }.should raise_error(NameError)
+  end
+
+  it "raises a NameError if the name contains non-alphabetic characters except '_'" do
+    Object.const_get("CS_CONST1").should == :const1
+    -> { ConstantSpecs.const_get "CS_CONST1=" }.should raise_error(NameError)
+    -> { ConstantSpecs.const_get "CS_CONST1?" }.should raise_error(NameError)
+  end
+
+  it "calls #to_str to convert the given name to a String" do
+    name = mock("ClassA")
+    name.should_receive(:to_str).and_return("ClassA")
+    ConstantSpecs.const_get(name).should == ConstantSpecs::ClassA
+  end
+
+  it "raises a TypeError if conversion to a String by calling #to_str fails" do
+    name = mock('123')
+    -> { ConstantSpecs.const_get(name) }.should raise_error(TypeError)
+
+    name.should_receive(:to_str).and_return(123)
+    -> { ConstantSpecs.const_get(name) }.should raise_error(TypeError)
+  end
+
+  it "calls #const_missing on the receiver if unable to locate the constant" do
+    ConstantSpecs::ContainerA.should_receive(:const_missing).with(:CS_CONSTX)
+    ConstantSpecs::ContainerA.const_get(:CS_CONSTX)
+  end
+
+  it "does not search the singleton class of a Class or Module" do
+    -> do
+      ConstantSpecs::ContainerA::ChildA.const_get(:CS_CONST14)
+    end.should raise_error(NameError)
+    -> { ConstantSpecs.const_get(:CS_CONST14) }.should raise_error(NameError)
+  end
+
+  it "does not search the containing scope" do
+    ConstantSpecs::ContainerA::ChildA.const_get(:CS_CONST20).should == :const20_2
+    -> do
+      ConstantSpecs::ContainerA::ChildA.const_get(:CS_CONST5)
+    end.should raise_error(NameError)
+  end
+
+  it "raises a NameError if the constant is defined in the receiver's superclass and the inherit flag is false" do
+    -> do
+      ConstantSpecs::ContainerA::ChildA.const_get(:CS_CONST4, false)
+    end.should raise_error(NameError)
+  end
+
+  it "searches into the receiver superclasses if the inherit flag is true" do
+    ConstantSpecs::ContainerA::ChildA.const_get(:CS_CONST4, true).should == :const4
+  end
+
+  it "raises a NameError when the receiver is a Module, the constant is defined at toplevel and the inherit flag is false" do
+    -> do
+      ConstantSpecs::ModuleA.const_get(:CS_CONST1, false)
+    end.should raise_error(NameError)
+  end
+
+  it "raises a NameError when the receiver is a Class, the constant is defined at toplevel and the inherit flag is false" do
+    -> do
+      ConstantSpecs::ContainerA::ChildA.const_get(:CS_CONST1, false)
+    end.should raise_error(NameError)
+  end
+
+  it "coerces the inherit flag to a boolean" do
+    ConstantSpecs::ContainerA::ChildA.const_get(:CS_CONST4, :true).should == :const4
+
+    -> do
+      ConstantSpecs::ContainerA::ChildA.const_get(:CS_CONST1, nil)
+    end.should raise_error(NameError)
+  end
+
+  it "accepts a toplevel scope qualifier" do
+    ConstantSpecs.const_get("::CS_CONST1").should == :const1
+  end
+
+  it "accepts a toplevel scope qualifier when inherit is false" do
+    ConstantSpecs.const_get("::CS_CONST1", false).should == :const1
+    -> { ConstantSpecs.const_get("CS_CONST1", false) }.should raise_error(NameError)
+  end
+
+  it "returns a constant whose module is defined the toplevel" do
+    ConstantSpecs.const_get("ConstantSpecsTwo::Foo").should == :cs_two_foo
+    ConstantSpecsThree.const_get("ConstantSpecsTwo::Foo").should == :cs_three_foo
+  end
+
+  it "accepts a scoped constant name" do
+    ConstantSpecs.const_get("ClassA::CS_CONST10").should == :const10_10
+  end
+
+  it "raises a NameError if the name includes two successive scope separators" do
+    -> { ConstantSpecs.const_get("ClassA::::CS_CONST10") }.should raise_error(NameError)
+  end
+
+  it "raises a NameError if only '::' is passed" do
+    -> { ConstantSpecs.const_get("::") }.should raise_error(NameError)
+  end
+
+  it "raises a NameError if a Symbol has a toplevel scope qualifier" do
+    -> { ConstantSpecs.const_get(:'::CS_CONST1') }.should raise_error(NameError)
+  end
+
+  it "raises a NameError if a Symbol is a scoped constant name" do
+    -> { ConstantSpecs.const_get(:'ClassA::CS_CONST10') }.should raise_error(NameError)
+  end
+
+  it "does read private constants" do
+    ConstantSpecs.const_get(:CS_PRIVATE).should == :cs_private
+  end
+
+  it 'does autoload a constant' do
+    Object.const_get('CSAutoloadA').name.should == 'CSAutoloadA'
+  end
+
+  it 'does autoload a constant with a toplevel scope qualifier' do
+    Object.const_get('::CSAutoloadB').name.should == 'CSAutoloadB'
+  end
+
+  it 'does autoload a module and resolve a constant within' do
+    Object.const_get('CSAutoloadC::CONST').should == 7
+  end
+
+  it 'does autoload a non-toplevel module' do
+    Object.const_get('CSAutoloadD::InnerModule').name.should == 'CSAutoloadD::InnerModule'
+  end
+
+  it "raises a NameError when the nested constant does not exist on the module but exists in Object" do
+    -> { Object.const_get('ConstantSpecs::CS_CONST1') }.should raise_error(NameError)
+  end
+
+  describe "with statically assigned constants" do
+    it "searches the immediate class or module first" do
+      ConstantSpecs::ClassA.const_get(:CS_CONST10).should == :const10_10
+      ConstantSpecs::ModuleA.const_get(:CS_CONST10).should == :const10_1
+      ConstantSpecs::ParentA.const_get(:CS_CONST10).should == :const10_5
+      ConstantSpecs::ContainerA.const_get(:CS_CONST10).should == :const10_2
+      ConstantSpecs::ContainerA::ChildA.const_get(:CS_CONST10).should == :const10_3
+    end
+
+    it "searches a module included in the immediate class before the superclass" do
+      ConstantSpecs::ContainerA::ChildA.const_get(:CS_CONST15).should == :const15_1
+    end
+
+    it "searches the superclass before a module included in the superclass" do
+      ConstantSpecs::ContainerA::ChildA.const_get(:CS_CONST11).should == :const11_1
+    end
+
+    it "searches a module included in the superclass" do
+      ConstantSpecs::ContainerA::ChildA.const_get(:CS_CONST12).should == :const12_1
+    end
+
+    it "searches the superclass chain" do
+      ConstantSpecs::ContainerA::ChildA.const_get(:CS_CONST13).should == :const13
+    end
+
+    it "returns a toplevel constant when the receiver is a Class" do
+      ConstantSpecs::ContainerA::ChildA.const_get(:CS_CONST1).should == :const1
+    end
+
+    it "returns a toplevel constant when the receiver is a Module" do
+      ConstantSpecs.const_get(:CS_CONST1).should == :const1
+      ConstantSpecs::ModuleA.const_get(:CS_CONST1).should == :const1
+    end
+  end
+
+  describe "with dynamically assigned constants" do
+    it "searches the immediate class or module first" do
+      ConstantSpecs::ClassA::CS_CONST301 = :const301_1
+      ConstantSpecs::ClassA.const_get(:CS_CONST301).should == :const301_1
+
+      ConstantSpecs::ModuleA::CS_CONST301 = :const301_2
+      ConstantSpecs::ModuleA.const_get(:CS_CONST301).should == :const301_2
+
+      ConstantSpecs::ParentA::CS_CONST301 = :const301_3
+      ConstantSpecs::ParentA.const_get(:CS_CONST301).should == :const301_3
+
+      ConstantSpecs::ContainerA::ChildA::CS_CONST301 = :const301_5
+      ConstantSpecs::ContainerA::ChildA.const_get(:CS_CONST301).should == :const301_5
+    ensure
+      ConstantSpecs::ClassA.send(:remove_const, :CS_CONST301)
+      ConstantSpecs::ModuleA.send(:remove_const, :CS_CONST301)
+      ConstantSpecs::ParentA.send(:remove_const, :CS_CONST301)
+      ConstantSpecs::ContainerA::ChildA.send(:remove_const, :CS_CONST301)
+    end
+
+    it "searches a module included in the immediate class before the superclass" do
+      ConstantSpecs::ParentB::CS_CONST302 = :const302_1
+      ConstantSpecs::ModuleF::CS_CONST302 = :const302_2
+      ConstantSpecs::ContainerB::ChildB.const_get(:CS_CONST302).should == :const302_2
+    ensure
+      ConstantSpecs::ParentB.send(:remove_const, :CS_CONST302)
+      ConstantSpecs::ModuleF.send(:remove_const, :CS_CONST302)
+    end
+
+    it "searches the superclass before a module included in the superclass" do
+      ConstantSpecs::ModuleE::CS_CONST303 = :const303_1
+      ConstantSpecs::ParentB::CS_CONST303 = :const303_2
+      ConstantSpecs::ContainerB::ChildB.const_get(:CS_CONST303).should == :const303_2
+    ensure
+      ConstantSpecs::ModuleE.send(:remove_const, :CS_CONST303)
+      ConstantSpecs::ParentB.send(:remove_const, :CS_CONST303)
+    end
+
+    it "searches a module included in the superclass" do
+      ConstantSpecs::ModuleA::CS_CONST304 = :const304_1
+      ConstantSpecs::ModuleE::CS_CONST304 = :const304_2
+      ConstantSpecs::ContainerB::ChildB.const_get(:CS_CONST304).should == :const304_2
+    ensure
+      ConstantSpecs::ModuleA.send(:remove_const, :CS_CONST304)
+      ConstantSpecs::ModuleE.send(:remove_const, :CS_CONST304)
+    end
+
+    it "searches the superclass chain" do
+      ConstantSpecs::ModuleA::CS_CONST305 = :const305
+      ConstantSpecs::ContainerB::ChildB.const_get(:CS_CONST305).should == :const305
+    ensure
+      ConstantSpecs::ModuleA.send(:remove_const, :CS_CONST305)
+    end
+
+    it "returns a toplevel constant when the receiver is a Class" do
+      Object::CS_CONST306 = :const306
+      ConstantSpecs::ContainerB::ChildB.const_get(:CS_CONST306).should == :const306
+    ensure
+      Object.send(:remove_const, :CS_CONST306)
+    end
+
+    it "returns a toplevel constant when the receiver is a Module" do
+      Object::CS_CONST308 = :const308
+      ConstantSpecs.const_get(:CS_CONST308).should == :const308
+      ConstantSpecs::ModuleA.const_get(:CS_CONST308).should == :const308
+    ensure
+      Object.send(:remove_const, :CS_CONST308)
+    end
+
+    it "returns the updated value of a constant" do
+      ConstantSpecs::ClassB::CS_CONST309 = :const309_1
+      ConstantSpecs::ClassB.const_get(:CS_CONST309).should == :const309_1
+
+      -> {
+        ConstantSpecs::ClassB::CS_CONST309 = :const309_2
+      }.should complain(/already initialized constant/)
+      ConstantSpecs::ClassB.const_get(:CS_CONST309).should == :const309_2
+    ensure
+      ConstantSpecs::ClassB.send(:remove_const, :CS_CONST309)
+    end
+  end
+end