* test/ruby/test_iseq.rb (TestISeq#test_disasm_encoding): set default

  encoding not to be affected by environment variables.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@36011 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 6 insertions, 4 deletions

diff --git a/test/ruby/test_iseq.rb b/test/ruby/test_iseq.rb
index c30a0f9f20..25a282ee2d 100644
--- a/test/ruby/test_iseq.rb
+++ b/test/ruby/test_iseq.rb
@@ -18,9 +18,11 @@ class TestISeq < Test::Unit::TestCase
 
   def test_disasm_encoding
     src = "\u{3042} = 1"
-    enc = Encoding.default_internal || Encoding.default_external
-    assert_equal(enc, RubyVM::InstructionSequence.compile(src.encode(enc)).disasm.encoding)
-    enc = enc == Encoding::UTF_8 ? Encoding::Shift_JIS : Encoding::UTF_8
-    assert_equal(true, RubyVM::InstructionSequence.compile(src.encode(enc)).disasm.ascii_only?)
+    enc, Encoding.default_internal = Encoding.default_internal, src.encoding
+    assert_equal(src.encoding, RubyVM::InstructionSequence.compile(src).disasm.encoding)
+    src.encode!(Encoding::Shift_JIS)
+    assert_equal(true, RubyVM::InstructionSequence.compile(src).disasm.ascii_only?)
+  ensure
+    Encoding.default_internal = enc
   end
 end