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-rw-r--r--spec/ruby/core/array/shared/join.rb14
1 files changed, 14 insertions, 0 deletions
diff --git a/spec/ruby/core/array/shared/join.rb b/spec/ruby/core/array/shared/join.rb
index 5e7193de8a..c443d9a628 100644
--- a/spec/ruby/core/array/shared/join.rb
+++ b/spec/ruby/core/array/shared/join.rb
@@ -113,6 +113,20 @@ describe :array_join_with_default_separator, shared: true do
-> { ary_utf8_bad_binary.send(@method) }.should raise_error(EncodingError)
end
+
+ ruby_version_is "2.7" do
+ context "when $, is not nil" do
+ before do
+ suppress_warning do
+ $, = '*'
+ end
+ end
+
+ it "warns" do
+ -> { [].join }.should complain(/warning: \$, is set to non-nil value/)
+ end
+ end
+ end
end
describe :array_join_with_string_separator, shared: true do