1 files changed, 15 insertions, 0 deletions

diff --git a/spec/ruby/command_line/dash_internal_encoding_spec.rb b/spec/ruby/command_line/dash_internal_encoding_spec.rb
new file mode 100644
index 0000000000..3049040bb4
--- /dev/null
+++ b/spec/ruby/command_line/dash_internal_encoding_spec.rb
@@ -0,0 +1,15 @@
+require_relative '../spec_helper'
+
+describe 'The --internal-encoding command line option sets Encoding.default_internal' do
+  before :each do
+    @test_string = "print Encoding.default_internal.name"
+  end
+
+  it "if given an encoding with an =" do
+    ruby_exe(@test_string, options: '--internal-encoding=big5').should == Encoding::Big5.name
+  end
+
+  it "if given an encoding as a separate argument" do
+    ruby_exe(@test_string, options: '--internal-encoding big5').should == Encoding::Big5.name
+  end
+end