1 files changed, 17 insertions, 0 deletions
diff --git a/spec/ruby/core/kernel/shared/sprintf.rb b/spec/ruby/core/kernel/shared/sprintf.rb
index ca1e6bb2ed..6d62a65f7c 100644
--- a/spec/ruby/core/kernel/shared/sprintf.rb
+++ b/spec/ruby/core/kernel/shared/sprintf.rb
@@ -342,6 +342,23 @@ describe :kernel_sprintf, shared: true do
         sub_string = long_string[8, 5]
         sprintf("%.#{1 * 3}s", sub_string).should == "hel"
       end
+
+      it "formats string with precision" do
+        Kernel.format("%.3s", "hello").should == "hel"
+        Kernel.format("%-3.3s", "hello").should == "hel"
+      end
+
+      it "formats multibyte string with precision" do
+        Kernel.format("%.2s", "été").should == "ét"
+      end
+
+      it "preserves encoding of the format string" do
+        str = format('%s'.encode(Encoding::UTF_8), 'foobar')
+        str.encoding.should == Encoding::UTF_8
+
+        str = format('%s'.encode(Encoding::US_ASCII), 'foobar')
+        str.encoding.should == Encoding::US_ASCII
+      end
     end
 
     describe "%" do