1 files changed, 37 insertions, 0 deletions
diff --git a/spec/ruby/command_line/dash_upper_e_spec.rb b/spec/ruby/command_line/dash_upper_e_spec.rb
new file mode 100644
index 0000000000..5a83962583
--- /dev/null
+++ b/spec/ruby/command_line/dash_upper_e_spec.rb
@@ -0,0 +1,37 @@
+require_relative '../spec_helper'
+
+describe "ruby -E" do
+  it "sets the external encoding with '-E external'" do
+    result = ruby_exe("print Encoding.default_external", options: '-E euc-jp')
+    result.should == "EUC-JP"
+  end
+
+  platform_is_not :windows do
+    it "also sets the filesystem encoding with '-E external'" do
+      result = ruby_exe("print Encoding.find('filesystem')", options: '-E euc-jp')
+      result.should == "EUC-JP"
+    end
+  end
+
+  it "sets the external encoding with '-E external:'" do
+    result = ruby_exe("print Encoding.default_external", options: '-E Shift_JIS:')
+    result.should == "Shift_JIS"
+  end
+
+  it "sets the internal encoding with '-E :internal'" do
+    ruby_exe("print Encoding.default_internal", options: '-E :SHIFT_JIS').
+      should == 'Shift_JIS'
+  end
+
+  it "sets the external and internal encodings with '-E external:internal'" do
+    ruby_exe("puts Encoding.default_external, Encoding.default_internal", options: '-E euc-jp:SHIFT_JIS').
+      should == "EUC-JP\nShift_JIS\n"
+  end
+
+  it "raises a RuntimeError if used with -U" do
+    ruby_exe("p 1",
+             options: '-Eascii:ascii -U',
+             args: '2>&1',
+             exit_status: 1).should =~ /RuntimeError/
+  end
+end