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-rw-r--r--tdb.gemspec1
1 files changed, 1 insertions, 0 deletions
diff --git a/tdb.gemspec b/tdb.gemspec
index aaed8a3..72d3e35 100644
--- a/tdb.gemspec
+++ b/tdb.gemspec
@@ -19,5 +19,6 @@ Gem::Specification.new do |s|
   s.test_files = Dir['test/test_*.rb']
   s.extensions = %w(ext/tdb/extconf.rb)
   s.add_development_dependency('wrongdoc', '~> 1.8', '>= 1.8.1')
+  s.add_development_dependency('test-unit', '>= 2.0', '< 4.0')
   s.licenses = %w(LGPLv2.1+)
 end