Add in-tree mspec and ruby/spec

* For easier modifications of ruby/spec by MRI developers.
* .gitignore: track changes under spec.
* spec/mspec, spec/rubyspec: add in-tree mspec and ruby/spec.
  These files can therefore be updated like any other file in MRI.
  Instructions are provided in spec/README.
  [Feature #13156] [ruby-core:79246]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58595 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 59 insertions, 0 deletions

diff --git a/spec/rubyspec/core/kernel/remove_instance_variable_spec.rb b/spec/rubyspec/core/kernel/remove_instance_variable_spec.rb
new file mode 100644
index 0000000000..6a9f78b9bc
--- /dev/null
+++ b/spec/rubyspec/core/kernel/remove_instance_variable_spec.rb
@@ -0,0 +1,59 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+require File.expand_path('../fixtures/classes', __FILE__)
+
+describe :kernel_remove_instance_variable, shared: true do
+  it "returns the instance variable's value" do
+    value = @instance.send :remove_instance_variable, @object
+    value.should == "hello"
+  end
+
+  it "removes the instance variable" do
+    @instance.send :remove_instance_variable, @object
+    @instance.instance_variable_defined?(@object).should be_false
+  end
+end
+
+describe "Kernel#remove_instance_variable" do
+  before do
+    @instance = KernelSpecs::InstanceVariable.new
+  end
+
+  it "is a public method" do
+    Kernel.should have_public_instance_method(:remove_instance_variable, false)
+  end
+
+  it "raises a NameError if the instance variable is not defined" do
+    lambda do
+      @instance.send :remove_instance_variable, :@unknown
+    end.should raise_error(NameError)
+  end
+
+  it "raises a NameError if the argument is not a valid instance variable name" do
+    lambda do
+      @instance.send :remove_instance_variable, :"@0"
+    end.should raise_error(NameError)
+  end
+
+  it "raises a TypeError if passed an Object not defining #to_str" do
+    lambda do
+      obj = mock("kernel remove_instance_variable")
+      @instance.send :remove_instance_variable, obj
+    end.should raise_error(TypeError)
+  end
+
+  describe "when passed a String" do
+    it_behaves_like :kernel_remove_instance_variable, nil, "@greeting"
+  end
+
+  describe "when passed a Symbol" do
+    it_behaves_like :kernel_remove_instance_variable, nil, :@greeting
+  end
+
+  describe "when passed an Object" do
+    it "calls #to_str to convert the argument" do
+      name = mock("kernel remove_instance_variable")
+      name.should_receive(:to_str).and_return("@greeting")
+      @instance.send :remove_instance_variable, name
+    end
+  end
+end