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-rw-r--r--test/test_tmpdir.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/test/test_tmpdir.rb b/test/test_tmpdir.rb
index 50583b5ce1..5cd0b5ef92 100644
--- a/test/test_tmpdir.rb
+++ b/test/test_tmpdir.rb
@@ -5,7 +5,7 @@ require 'tmpdir'
class TestTmpdir < Test::Unit::TestCase
def test_tmpdir_modifiable
tmpdir = Dir.tmpdir
- assert_equal(false, tmpdir.frozen?)
+ assert_not_predicate(tmpdir, :frozen?)
tmpdir_org = tmpdir.dup
tmpdir << "foo"
assert_equal(tmpdir_org, Dir.tmpdir)