1 files changed, 7 insertions, 2 deletions
diff --git a/spec/ruby/core/array/pack/b_spec.rb b/spec/ruby/core/array/pack/b_spec.rb
index 872c1b88d5..247a9ca023 100644
--- a/spec/ruby/core/array/pack/b_spec.rb
+++ b/spec/ruby/core/array/pack/b_spec.rb
@@ -1,4 +1,4 @@
-# -*- encoding: binary -*-
+# encoding: binary
 require_relative '../../../spec_helper'
 require_relative '../fixtures/classes'
 require_relative 'shared/basic'
@@ -13,11 +13,16 @@ describe "Array#pack with format 'B'" do
   it_behaves_like :array_pack_taint, 'B'
 
   it "calls #to_str to convert an Object to a String" do
-    obj = mock("pack H string")
+    obj = mock("pack B string")
     obj.should_receive(:to_str).and_return("``abcdef")
     [obj].pack("B*").should == "\x2a"
   end
 
+  it "will not implicitly convert a number to a string" do
+    -> { [0].pack('B') }.should raise_error(TypeError)
+    -> { [0].pack('b') }.should raise_error(TypeError)
+  end
+
   it "encodes one bit for each character starting with the most significant bit" do
     [ [["0"], "\x00"],
       [["1"], "\x80"]