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require_relative '../../spec_helper'
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 "never raises RangeError" do
for i in [4095, 0x4f7574206f6620636861722072616e67ff] do
@io.ungetbyte(i).should be_nil
@io.getbyte.should == 255
end
end
it "raises IOError on stream not opened for reading" do
-> { STDOUT.ungetbyte(42) }.should raise_error(IOError, "not opened for reading")
end
it "raises an IOError if the IO is closed" do
@io.close
-> { @io.ungetbyte(42) }.should raise_error(IOError)
end
end
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