1 files changed, 36 insertions, 0 deletions
diff --git a/spec/ruby/language/encoding_spec.rb b/spec/ruby/language/encoding_spec.rb
new file mode 100644
index 0000000000..e761a53cb6
--- /dev/null
+++ b/spec/ruby/language/encoding_spec.rb
@@ -0,0 +1,36 @@
+# -*- encoding: us-ascii -*-
+require_relative '../spec_helper'
+require_relative 'fixtures/coding_us_ascii'
+require_relative 'fixtures/coding_utf_8'
+
+describe "The __ENCODING__ pseudo-variable" do
+  it "is an instance of Encoding" do
+    __ENCODING__.should be_kind_of(Encoding)
+  end
+
+  it "is US-ASCII by default" do
+    __ENCODING__.should == Encoding::US_ASCII
+  end
+
+  it "is the evaluated strings's one inside an eval" do
+    eval("__ENCODING__".dup.force_encoding("US-ASCII")).should == Encoding::US_ASCII
+    eval("__ENCODING__".dup.force_encoding("BINARY")).should == Encoding::BINARY
+  end
+
+  it "is the encoding specified by a magic comment inside an eval" do
+    code = "# encoding: BINARY\n__ENCODING__".dup.force_encoding("US-ASCII")
+    eval(code).should == Encoding::BINARY
+
+    code = "# encoding: us-ascii\n__ENCODING__".dup.force_encoding("BINARY")
+    eval(code).should == Encoding::US_ASCII
+  end
+
+  it "is the encoding specified by a magic comment in the file" do
+    CodingUS_ASCII.encoding.should == Encoding::US_ASCII
+    CodingUTF_8.encoding.should == Encoding::UTF_8
+  end
+
+  it "raises a SyntaxError if assigned to" do
+    -> { eval("__ENCODING__ = 1") }.should raise_error(SyntaxError)
+  end
+end