1 files changed, 47 insertions, 0 deletions
diff --git a/spec/ruby/core/env/shift_spec.rb b/spec/ruby/core/env/shift_spec.rb
new file mode 100644
index 0000000000..52bd0f9139
--- /dev/null
+++ b/spec/ruby/core/env/shift_spec.rb
@@ -0,0 +1,47 @@
+require_relative '../../spec_helper'
+require_relative 'fixtures/common'
+
+describe "ENV.shift" do
+  before :each do
+    @orig = ENV.to_hash
+    @external = Encoding.default_external
+    @internal = Encoding.default_internal
+
+    Encoding.default_external = Encoding::BINARY
+    ENV.replace({"FOO"=>"BAR"})
+  end
+
+  after :each do
+    Encoding.default_external = @external
+    Encoding.default_internal = @internal
+    ENV.replace @orig
+  end
+
+  it "returns a pair and deletes it" do
+    ENV.should.has_key?("FOO")
+    pair = ENV.shift
+    pair.should == ["FOO", "BAR"]
+    ENV.should_not.has_key?("FOO")
+  end
+
+  it "returns nil if ENV.empty?" do
+    ENV.clear
+    ENV.shift.should == nil
+  end
+
+  it "uses the locale encoding if Encoding.default_internal is nil" do
+    Encoding.default_internal = nil
+
+    pair = ENV.shift
+    pair.first.encoding.should.equal?(ENVSpecs.encoding)
+    pair.last.encoding.should.equal?(ENVSpecs.encoding)
+  end
+
+  it "transcodes from the locale encoding to Encoding.default_internal if set" do
+    Encoding.default_internal = Encoding::IBM437
+
+    pair = ENV.shift
+    pair.first.encoding.should.equal?(Encoding::IBM437)
+    pair.last.encoding.should.equal?(Encoding::IBM437)
+  end
+end