1 files changed, 62 insertions, 0 deletions
diff --git a/spec/ruby/language/magic_comment_spec.rb b/spec/ruby/language/magic_comment_spec.rb
new file mode 100644
index 0000000000..2f6e3b5c3a
--- /dev/null
+++ b/spec/ruby/language/magic_comment_spec.rb
@@ -0,0 +1,62 @@
+require File.expand_path('../../spec_helper', __FILE__)
+
+describe "Magic comment" do
+  it "is optional" do
+    eval("__ENCODING__").should be_an_instance_of(Encoding)
+  end
+
+  it "determines __ENCODING__" do
+    eval(<<EOS.force_encoding("US-ASCII")).should == Encoding::ASCII_8BIT
+# encoding: ASCII-8BIT
+__ENCODING__
+EOS
+  end
+
+  it "is case-insensitive" do
+    eval(<<EOS.force_encoding("US-ASCII")).should == Encoding::ASCII_8BIT
+# CoDiNg:   aScIi-8bIt
+__ENCODING__
+EOS
+  end
+
+  it "must be at the first line" do
+    eval(<<EOS.force_encoding("US-ASCII")).should == Encoding::US_ASCII
+
+# encoding: ASCII-8BIT
+__ENCODING__
+EOS
+  end
+
+  it "must be the first token of the line" do
+    eval(<<EOS.force_encoding("US-ASCII")).should == Encoding::US_ASCII
+1+1 # encoding: ASCII-8BIT
+__ENCODING__
+EOS
+    eval(<<EOS.force_encoding("US-ASCII")).should == Encoding::ASCII_8BIT
+  # encoding: ASCII-8BIT
+__ENCODING__
+EOS
+  end
+
+  it "can be after the shebang" do
+    eval(<<EOS.force_encoding("US-ASCII")).should == Encoding::ASCII_8BIT
+#!/usr/bin/ruby -Ku
+# encoding: ASCII-8BIT
+__ENCODING__
+EOS
+  end
+
+  it "can take Emacs style" do
+    eval(<<EOS.force_encoding("US-ASCII")).should == Encoding::ASCII_8BIT
+# -*- encoding: ascii-8bit -*-
+__ENCODING__
+EOS
+  end
+
+  it "can take vim style" do
+    eval(<<EOS.force_encoding("US-ASCII")).should == Encoding::ASCII_8BIT
+# vim: filetype=ruby, fileencoding=ascii-8bit, tabsize=3, shiftwidth=3
+__ENCODING__
+EOS
+  end
+end