1 files changed, 74 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..855f4e9f32
--- /dev/null
+++ b/spec/ruby/core/encoding/default_internal_spec.rb
@@ -0,0 +1,74 @@
+require_relative '../../spec_helper'
+
+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::BINARY
+    Encoding.default_internal.should == Encoding::BINARY
+  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)
+
+    -> { Encoding.default_internal = obj }.should raise_error(TypeError)
+  end
+
+  it "raises a TypeError when passed an object not providing #to_str" do
+    -> { 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