1 files changed, 12 insertions, 6 deletions
diff --git a/spec/ruby/core/kernel/shared/sprintf.rb b/spec/ruby/core/kernel/shared/sprintf.rb
index e595a06640..9935d27db9 100644
--- a/spec/ruby/core/kernel/shared/sprintf.rb
+++ b/spec/ruby/core/kernel/shared/sprintf.rb
@@ -1,3 +1,5 @@
+require File.expand_path('../../../../shared/hash/key_error', __FILE__)
+
 describe :kernel_sprintf, shared: true do
   def format(*args)
     @method.call(*args)
@@ -823,12 +825,6 @@ describe :kernel_sprintf, shared: true do
           format("%d %<foo>d", 1, foo: "123")
         }.should raise_error(ArgumentError)
       end
-
-      it "raises KeyError when there is no matching key" do
-        -> () {
-          format("%<foo>s", {})
-        }.should raise_error(KeyError)
-      end
     end
 
     describe "%{name} style" do
@@ -868,4 +864,14 @@ describe :kernel_sprintf, shared: true do
       end
     end
   end
+
+  describe "faulty key" do
+    before :all do
+      @base_method = @method
+    end
+
+    it_behaves_like :key_error, -> (obj, key) {
+      @base_method.call("%<#{key}>s", obj)
+    }, { foooo: 1 }
+  end
 end