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, 37 insertions, 0 deletions

diff --git a/spec/mspec/spec/helpers/argf_spec.rb b/spec/mspec/spec/helpers/argf_spec.rb
new file mode 100644
index 0000000000..cf5eb0fe88
--- /dev/null
+++ b/spec/mspec/spec/helpers/argf_spec.rb
@@ -0,0 +1,37 @@
+require 'spec_helper'
+require 'mspec/guards'
+require 'mspec/helpers'
+
+describe Object, "#argf" do
+  before :each do
+    @saved_argv = ARGV.dup
+    @argv = [__FILE__]
+  end
+
+  it "sets @argf to an instance of ARGF.class with the given argv" do
+    argf @argv do
+      @argf.should be_an_instance_of ARGF.class
+      @argf.filename.should == @argv.first
+    end
+    @argf.should be_nil
+  end
+
+  it "does not alter ARGV nor ARGF" do
+    argf @argv do
+    end
+    ARGV.should == @saved_argv
+    ARGF.argv.should == @saved_argv
+  end
+
+  it "does not close STDIN" do
+    argf ['-'] do
+    end
+    STDIN.should_not be_closed
+  end
+
+  it "disallows nested calls" do
+    argf @argv do
+      lambda { argf @argv }.should raise_error
+    end
+  end
+end