spec/string_spec.rb in utf8-0.1.0 vs spec/string_spec.rb in utf8-0.1.1

@@ -7,9 +7,26 @@
     @str = @char_array.join
     @utf8 = @str.as_utf8
     @utf8_len = @char_array.size
   end
 
+  it "should blow up on invalid utf8 chars" do
+    # lets cut right into the middle of a sequence so we know it's bad
+    utf8 = @str[0..1].as_utf8
+
+    lambda {
+      utf8.length
+    }.should raise_error(ArgumentError)
+
+    lambda {
+      utf8[0, 10]
+    }.should raise_error(ArgumentError)
+
+    lambda {
+      utf8.chars.to_a
+    }.should raise_error(ArgumentError)
+  end
+
   it "should extend String, adding an as_utf8 method that returns a String::UTF8 instance" do
     "".should respond_to(:as_utf8)
     "".as_utf8.class.should eql(String::UTF8)
   end
 
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