1 files changed, 25 insertions, 3 deletions
diff --git a/spec/ruby/library/stringscanner/append_spec.rb b/spec/ruby/library/stringscanner/append_spec.rb
index fef5dcf2bd..68747d52d7 100644
--- a/spec/ruby/library/stringscanner/append_spec.rb
+++ b/spec/ruby/library/stringscanner/append_spec.rb
@@ -1,11 +1,33 @@
 require_relative '../../spec_helper'
-require_relative 'shared/concat'
 require 'strscan'
 
 describe "StringScanner#<<" do
-  it_behaves_like :strscan_concat, :<<
+  it "concatenates the given argument to self and returns self" do
+    s = StringScanner.new(+"hello ")
+    (s. << 'world').should == s
+    s.string.should == "hello world"
+    s.eos?.should == false
+  end
+
+  it "raises a TypeError if the given argument can't be converted to a String" do
+    -> { StringScanner.new('hello') << :world    }.should.raise(TypeError)
+    -> { StringScanner.new('hello') << mock('x') }.should.raise(TypeError)
+  end
 end
 
 describe "StringScanner#<< when passed an Integer" do
-  it_behaves_like :strscan_concat_fixnum, :<<
+  it "raises a TypeError" do
+    a = StringScanner.new("hello world")
+    -> { a << 333 }.should.raise(TypeError)
+    b = StringScanner.new("")
+    -> { b << (256 * 3 + 64) }.should.raise(TypeError)
+    -> { b << -200           }.should.raise(TypeError)
+  end
+
+  it "doesn't call to_int on the argument" do
+    x = mock('x')
+    x.should_not_receive(:to_int)
+
+    -> { StringScanner.new("") << x }.should.raise(TypeError)
+  end
 end