require File.expand_path('../../../spec_helper', __FILE__) require File.expand_path('../fixtures/classes', __FILE__) describe "StringIO#ungetc when passed [char]" do before :each do @io = StringIO.new('1234') end it "writes the passed char before the current position" do @io.pos = 1 @io.ungetc(?A) @io.string.should == 'A234' end it "returns nil" do @io.pos = 1 @io.ungetc(?A).should be_nil end it "decreases the current position by one" do @io.pos = 2 @io.ungetc(?A) @io.pos.should eql(1) end it "pads with \\000 when the current position is after the end" do @io.pos = 15 @io.ungetc(?A) @io.string.should == "1234\000\000\000\000\000\000\000\000\000\000A" end it "tries to convert the passed argument to an String using #to_str" do obj = mock("to_str") obj.should_receive(:to_str).and_return(?A) @io.pos = 1 @io.ungetc(obj) @io.string.should == "A234" end it "raises a TypeError when the passed length can't be converted to an Integer or String" do lambda { @io.ungetc(Object.new) }.should raise_error(TypeError) end end describe "StringIO#ungetc when self is not readable" do it "raises an IOError" do io = StringIO.new("test", "w") io.pos = 1 lambda { io.ungetc(?A) }.should raise_error(IOError) io = StringIO.new("test") io.pos = 1 io.close_read lambda { io.ungetc(?A) }.should raise_error(IOError) end end # Note: This is incorrect. # # describe "StringIO#ungetc when self is not writable" do # it "raises an IOError" do # io = StringIO.new("test", "r") # io.pos = 1 # lambda { io.ungetc(?A) }.should raise_error(IOError) # # io = StringIO.new("test") # io.pos = 1 # io.close_write # lambda { io.ungetc(?A) }.should raise_error(IOError) # end # end