8 files changed, 58 insertions, 0 deletions
diff --git a/spec/ruby/language/predefined/data_spec.rb b/spec/ruby/language/predefined/data_spec.rb
new file mode 100644
index 0000000000..f616879527
--- /dev/null
+++ b/spec/ruby/language/predefined/data_spec.rb
@@ -0,0 +1,29 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "The DATA constant" do
+  it "exists when the main script contains __END__" do
+    ruby_exe(fixture(__FILE__, "data1.rb")).chomp.should == "true"
+  end
+
+  it "does not exist when the main script contains no __END__" do
+    ruby_exe("puts Object.const_defined?(:DATA)").chomp.should == 'false'
+  end
+
+  it "does not exist when an included file has a __END__" do
+    ruby_exe(fixture(__FILE__, "data2.rb")).chomp.should == "false"
+  end
+
+  it "does not change when an included files also has a __END__" do
+    ruby_exe(fixture(__FILE__, "data3.rb")).chomp.should == "data 3"
+  end
+
+  it "is included in an otherwise empty file" do
+    ap = fixture(__FILE__, "print_data.rb")
+    str = ruby_exe(fixture(__FILE__, "data_only.rb"), options: "-r#{ap}")
+    str.chomp.should == "data only"
+  end
+
+  it "rewinds to the head of the main script" do
+    ruby_exe(fixture(__FILE__, "data5.rb")).chomp.should == "DATA.rewind"
+  end
+end
diff --git a/spec/ruby/language/predefined/fixtures/data1.rb b/spec/ruby/language/predefined/fixtures/data1.rb
new file mode 100644
index 0000000000..cb9572255b
--- /dev/null
+++ b/spec/ruby/language/predefined/fixtures/data1.rb
@@ -0,0 +1,4 @@
+puts Object.const_defined?(:DATA)
+
+__END__
+data1
diff --git a/spec/ruby/language/predefined/fixtures/data2.rb b/spec/ruby/language/predefined/fixtures/data2.rb
new file mode 100644
index 0000000000..0f714b06d4
--- /dev/null
+++ b/spec/ruby/language/predefined/fixtures/data2.rb
@@ -0,0 +1,4 @@
+
+require File.expand_path("../data4.rb", __FILE__)
+
+p Object.const_defined?(:DATA)
diff --git a/spec/ruby/language/predefined/fixtures/data3.rb b/spec/ruby/language/predefined/fixtures/data3.rb
new file mode 100644
index 0000000000..6cbf63dae6
--- /dev/null
+++ b/spec/ruby/language/predefined/fixtures/data3.rb
@@ -0,0 +1,7 @@
+
+require File.expand_path("../data4.rb", __FILE__)
+
+puts DATA.read
+
+__END__
+data 3
diff --git a/spec/ruby/language/predefined/fixtures/data4.rb b/spec/ruby/language/predefined/fixtures/data4.rb
new file mode 100644
index 0000000000..139ef80d7b
--- /dev/null
+++ b/spec/ruby/language/predefined/fixtures/data4.rb
@@ -0,0 +1,4 @@
+# nothing
+
+__END__
+data 4
diff --git a/spec/ruby/language/predefined/fixtures/data5.rb b/spec/ruby/language/predefined/fixtures/data5.rb
new file mode 100644
index 0000000000..48f060e1a9
--- /dev/null
+++ b/spec/ruby/language/predefined/fixtures/data5.rb
@@ -0,0 +1,5 @@
+DATA.rewind
+puts DATA.gets
+
+__END__
+data 5
diff --git a/spec/ruby/language/predefined/fixtures/data_only.rb b/spec/ruby/language/predefined/fixtures/data_only.rb
new file mode 100644
index 0000000000..004ac62737
--- /dev/null
+++ b/spec/ruby/language/predefined/fixtures/data_only.rb
@@ -0,0 +1,2 @@
+__END__
+data only
diff --git a/spec/ruby/language/predefined/fixtures/print_data.rb b/spec/ruby/language/predefined/fixtures/print_data.rb
new file mode 100644
index 0000000000..4a5692e6a7
--- /dev/null
+++ b/spec/ruby/language/predefined/fixtures/print_data.rb
@@ -0,0 +1,3 @@
+at_exit {
+  puts DATA.read
+}