1 files changed, 12 insertions, 2 deletions
diff --git a/spec/ruby/core/array/pack/z_spec.rb b/spec/ruby/core/array/pack/z_spec.rb
index 82ce7b4a1c..60f8f7bf10 100644
--- a/spec/ruby/core/array/pack/z_spec.rb
+++ b/spec/ruby/core/array/pack/z_spec.rb
@@ -1,4 +1,4 @@
-# -*- encoding: binary -*-
+# encoding: binary
 require_relative '../../../spec_helper'
 require_relative '../fixtures/classes'
 require_relative 'shared/basic'
@@ -12,11 +12,21 @@ describe "Array#pack with format 'Z'" do
   it_behaves_like :array_pack_string, 'Z'
   it_behaves_like :array_pack_taint, 'Z'
 
+  it "calls #to_str to convert an Object to a String" do
+    obj = mock("pack Z string")
+    obj.should_receive(:to_str).and_return("``abcdef")
+    [obj].pack("Z*").should == "``abcdef\x00"
+  end
+
+  it "will not implicitly convert a number to a string" do
+    -> { [0].pack('Z') }.should raise_error(TypeError)
+  end
+
   it "adds all the bytes and appends a NULL byte when passed the '*' modifier" do
     ["abc"].pack("Z*").should == "abc\x00"
   end
 
-  it "padds the output with NULL bytes when the count exceeds the size of the String" do
+  it "pads the output with NULL bytes when the count exceeds the size of the String" do
     ["abc"].pack("Z6").should == "abc\x00\x00\x00"
   end