1 files changed, 11 insertions, 0 deletions
diff --git a/spec/ruby/core/array/pack/a_spec.rb b/spec/ruby/core/array/pack/a_spec.rb
index 7af7a16c68..f4a40502c2 100644
--- a/spec/ruby/core/array/pack/a_spec.rb
+++ b/spec/ruby/core/array/pack/a_spec.rb
@@ -12,6 +12,17 @@ describe "Array#pack with format 'A'" do
   it_behaves_like :array_pack_string, 'A'
   it_behaves_like :array_pack_taint, 'A'
 
+  it "calls #to_str to convert an Object to a String" do
+    obj = mock("pack A string")
+    obj.should_receive(:to_str).and_return("``abcdef")
+    [obj].pack("A*").should == "``abcdef"
+  end
+
+  it "will not implicitly convert a number to a string" do
+    -> { [0].pack('A') }.should raise_error(TypeError)
+    -> { [0].pack('a') }.should raise_error(TypeError)
+  end
+
   it "adds all the bytes to the output when passed the '*' modifier" do
     ["abc"].pack("A*").should == "abc"
   end