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, 43 insertions, 0 deletions

diff --git a/spec/rubyspec/language/unless_spec.rb b/spec/rubyspec/language/unless_spec.rb
new file mode 100644
index 0000000000..681f0adfdd
--- /dev/null
+++ b/spec/rubyspec/language/unless_spec.rb
@@ -0,0 +1,43 @@
+require File.expand_path('../../spec_helper', __FILE__)
+
+describe "The unless expression" do
+  it "evaluates the unless body when the expression is false" do
+    unless false
+      a = true
+    else
+      a = false
+    end
+
+    a.should == true
+  end
+
+  it "returns the last statement in the body" do
+    unless false
+      'foo'
+      'bar'
+      'baz'
+    end.should == 'baz'
+  end
+
+  it "evaluates the else body when the expression is true" do
+    unless true
+      'foo'
+    else
+      'bar'
+    end.should == 'bar'
+  end
+
+  it "takes an optional then after the expression" do
+    unless false then
+      'baz'
+    end.should == 'baz'
+  end
+
+  it "does not return a value when the expression is true" do
+    unless true; end.should == nil
+  end
+
+  it "allows expression and body to be on one line (using 'then')" do
+    unless false then 'foo'; else 'bar'; end.should == 'foo'
+  end
+end