1 files changed, 6 insertions, 0 deletions
diff --git a/spec/ruby/core/kernel/shared/sprintf.rb b/spec/ruby/core/kernel/shared/sprintf.rb
index 8defbfd665..1ad6f8a3cf 100644
--- a/spec/ruby/core/kernel/shared/sprintf.rb
+++ b/spec/ruby/core/kernel/shared/sprintf.rb
@@ -336,6 +336,12 @@ describe :kernel_sprintf, shared: true do
           @method.call("%s", obj)
         }.should raise_error(NoMethodError)
       end
+
+      it "formats a partial substring without including omitted characters" do
+        long_string = "aabbccddhelloddccbbaa"
+        sub_string = long_string[8, 5]
+        sprintf("%.#{1 * 3}s", sub_string).should == "hel"
+      end
     end
 
     describe "%" do