1 files changed, 93 insertions, 0 deletions
diff --git a/spec/ruby/core/encoding/default_internal_spec.rb b/spec/ruby/core/encoding/default_internal_spec.rb
new file mode 100644
index 0000000000..3234929eec
--- /dev/null
+++ b/spec/ruby/core/encoding/default_internal_spec.rb
@@ -0,0 +1,93 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+with_feature :encoding do
+  describe "Encoding.default_internal" do
+    before :each do
+      @original_encoding = Encoding.default_internal
+    end
+
+    after :each do
+      Encoding.default_internal = @original_encoding
+    end
+
+    it "is nil by default" do
+      Encoding.default_internal.should be_nil
+    end
+
+    it "returns an Encoding object if a default internal encoding is set" do
+      Encoding.default_internal = Encoding::ASCII
+      Encoding.default_internal.should be_an_instance_of(Encoding)
+    end
+
+    it "returns nil if no default internal encoding is set" do
+      Encoding.default_internal = nil
+      Encoding.default_internal.should be_nil
+    end
+
+    it "returns the default internal encoding" do
+      Encoding.default_internal = Encoding::ASCII_8BIT
+      Encoding.default_internal.should == Encoding::ASCII_8BIT
+    end
+
+    describe "with command line options" do
+      it "returns Encoding::UTF_8 if ruby was invoked with -U" do
+        ruby_exe("print Encoding.default_internal", options: '-U').
+          should == 'UTF-8'
+      end
+
+      it "uses the encoding specified when ruby is invoked with an '-E :internal' argument" do
+        ruby_exe("print Encoding.default_internal", options: '-E :SHIFT_JIS').
+          should == 'Shift_JIS'
+      end
+
+      it "uses the encoding specified when ruby is invoked with an '-E external:internal' argument" do
+        ruby_exe("print Encoding.default_internal", options: '-E UTF-8:SHIFT_JIS').
+          should == 'Shift_JIS'
+      end
+    end
+  end
+
+  describe "Encoding.default_internal=" do
+    before :each do
+      @original_encoding = Encoding.default_internal
+    end
+
+    after :each do
+      Encoding.default_internal = @original_encoding
+    end
+
+    it "sets the default internal encoding" do
+      Encoding.default_internal = Encoding::SHIFT_JIS
+      Encoding.default_internal.should == Encoding::SHIFT_JIS
+    end
+
+    it "can accept a name of an encoding as a String" do
+      Encoding.default_internal = 'Shift_JIS'
+      Encoding.default_internal.should == Encoding::SHIFT_JIS
+    end
+
+    it "calls #to_str to convert an object to a String" do
+      obj = mock('string')
+      obj.should_receive(:to_str).at_least(1).times.and_return('ascii')
+
+      Encoding.default_internal = obj
+      Encoding.default_internal.should == Encoding::ASCII
+    end
+
+    it "raises a TypeError if #to_str does not return a String" do
+      obj = mock('string')
+      obj.should_receive(:to_str).at_least(1).times.and_return(1)
+
+      lambda { Encoding.default_internal = obj }.should raise_error(TypeError)
+    end
+
+    it "raises a TypeError when passed an object not providing #to_str" do
+      lambda { Encoding.default_internal = mock("encoding") }.should raise_error(TypeError)
+    end
+
+    it "accepts an argument of nil to unset the default internal encoding" do
+      Encoding.default_internal = nil
+      Encoding.default_internal.should be_nil
+    end
+  end
+end