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, 90 insertions, 0 deletions

diff --git a/spec/rubyspec/language/or_spec.rb b/spec/rubyspec/language/or_spec.rb
new file mode 100644
index 0000000000..150d693996
--- /dev/null
+++ b/spec/rubyspec/language/or_spec.rb
@@ -0,0 +1,90 @@
+require File.expand_path('../../spec_helper', __FILE__)
+
+describe "The || operator" do
+  it "evaluates to true if any of its operands are true" do
+    if false || true || nil
+      x = true
+    end
+    x.should == true
+  end
+
+  it "evaluated to false if all of its operands are false" do
+    if false || nil
+      x = true
+    end
+    x.should == nil
+  end
+
+  it "is evaluated before assignment operators" do
+    x = nil || true
+    x.should == true
+  end
+
+  it "has a lower precedence than the && operator" do
+    x = 1 || false && x = 2
+    x.should == 1
+  end
+
+  it "treats empty expressions as nil" do
+    (() || true).should be_true
+    (() || false).should be_false
+    (true || ()).should be_true
+    (false || ()).should be_nil
+    (() || ()).should be_nil
+  end
+
+  it "has a higher precedence than 'break' in 'break true || false'" do
+    # see also 'break true or false' below
+    lambda { break false || true }.call.should be_true
+  end
+
+  it "has a higher precedence than 'next' in 'next true || false'" do
+    lambda { next false || true }.call.should be_true
+  end
+
+  it "has a higher precedence than 'return' in 'return true || false'" do
+    lambda { return false || true }.call.should be_true
+  end
+end
+
+describe "The or operator" do
+  it "evaluates to true if any of its operands are true" do
+    x = nil
+    if false or true
+      x = true
+    end
+    x.should == true
+  end
+
+  it "is evaluated after variables are assigned" do
+    x = nil or true
+    x.should == nil
+  end
+
+  it "has a lower precedence than the || operator" do
+    x,y = nil
+    x = true || false or y = 1
+    y.should == nil
+  end
+
+  it "treats empty expressions as nil" do
+    (() or true).should be_true
+    (() or false).should be_false
+    (true or ()).should be_true
+    (false or ()).should be_nil
+    (() or ()).should be_nil
+  end
+
+  it "has a lower precedence than 'break' in 'break true or false'" do
+    # see also 'break true || false' above
+    lambda { eval "break true or false" }.should raise_error(SyntaxError, /void value expression/)
+  end
+
+  it "has a lower precedence than 'next' in 'next true or false'" do
+    lambda { eval "next true or false" }.should raise_error(SyntaxError, /void value expression/)
+  end
+
+  it "has a lower precedence than 'return' in 'return true or false'" do
+    lambda { eval "return true or false" }.should raise_error(SyntaxError, /void value expression/)
+  end
+end