diff options
Diffstat (limited to 'spec/ruby/core/io/ungetbyte_spec.rb')
-rw-r--r-- | spec/ruby/core/io/ungetbyte_spec.rb | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/spec/ruby/core/io/ungetbyte_spec.rb b/spec/ruby/core/io/ungetbyte_spec.rb new file mode 100644 index 0000000000..ee334b469b --- /dev/null +++ b/spec/ruby/core/io/ungetbyte_spec.rb @@ -0,0 +1,48 @@ +require File.expand_path('../../../spec_helper', __FILE__) + +describe "IO#ungetbyte" do + before :each do + @name = tmp("io_ungetbyte") + touch(@name) { |f| f.write "a" } + @io = new_io @name, "r" + end + + after :each do + @io.close unless @io.closed? + rm_r @name + end + + it "does nothing when passed nil" do + @io.ungetbyte(nil).should be_nil + @io.getbyte.should == 97 + end + + it "puts back each byte in a String argument" do + @io.ungetbyte("cat").should be_nil + @io.getbyte.should == 99 + @io.getbyte.should == 97 + @io.getbyte.should == 116 + @io.getbyte.should == 97 + end + + it "calls #to_str to convert the argument" do + str = mock("io ungetbyte") + str.should_receive(:to_str).and_return("dog") + + @io.ungetbyte(str).should be_nil + @io.getbyte.should == 100 + @io.getbyte.should == 111 + @io.getbyte.should == 103 + @io.getbyte.should == 97 + end + + it "puts back one byte for an Integer argument" do + @io.ungetbyte(4095).should be_nil + @io.getbyte.should == 255 + end + + it "raises an IOError if the IO is closed" do + @io.close + lambda { @io.ungetbyte(42) }.should raise_error(IOError) + end +end |