1 files changed, 7 insertions, 0 deletions
diff --git a/spec/ruby/core/string/new_spec.rb b/spec/ruby/core/string/new_spec.rb
index 0a246f6f53..b429ac48d2 100644
--- a/spec/ruby/core/string/new_spec.rb
+++ b/spec/ruby/core/string/new_spec.rb
@@ -15,6 +15,13 @@ describe "String.new" do
     end
   end
 
+  ruby_version_is "2.4" do
+    it "accepts a capacity argument" do
+      String.new("", capacity: 100_000).should == ""
+      String.new("abc", capacity: 100_000).should == "abc"
+    end
+  end
+
   it "returns a fully-formed String" do
     str = String.new
     str.size.should == 0