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-rw-r--r--test/ruby/test_extlibs.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/test/ruby/test_extlibs.rb b/test/ruby/test_extlibs.rb
index 275b37b567..71dcf2b133 100644
--- a/test/ruby/test_extlibs.rb
+++ b/test/ruby/test_extlibs.rb
@@ -59,6 +59,7 @@ class TestExtLibs < Test::Unit::TestCase
check_existence "io/console"
check_existence "io/nonblock"
check_existence "io/wait"
+ check_existence "json"
check_existence "mathn/complex"
check_existence "mathn/rational"
check_existence "nkf"