require File.expand_path('../../../spec_helper', __FILE__) require File.expand_path('../fixtures/classes', __FILE__) describe "StringIO#putc when passed [String]" do before :each do @io = StringIO.new('example') end it "overwrites the character at the current position" do @io.putc("t") @io.string.should == "txample" @io.pos = 3 @io.putc("t") @io.string.should == "txatple" end it "only writes the first character from the passed String" do @io.putc("test") @io.string.should == "txample" end it "returns the passed String" do str = "test" @io.putc(str).should equal(str) end it "correctly updates the current position" do @io.putc("t") @io.pos.should == 1 @io.putc("test") @io.pos.should == 2 @io.putc("t") @io.pos.should == 3 end end describe "StringIO#putc when passed [Object]" do before :each do @io = StringIO.new('example') end it "it writes the passed Integer % 256 to self" do @io.putc(333) # 333 % 256 == ?M @io.string.should == "Mxample" @io.putc(-450) # -450 % 256 == ?> @io.string.should == "M>ample" end it "pads self with \\000 when the current position is after the end" do @io.pos = 10 @io.putc(?A) @io.string.should == "example\000\000\000A" end it "tries to convert the passed argument to an Integer using #to_int" do obj = mock('to_int') obj.should_receive(:to_int).and_return(116) @io.putc(obj) @io.string.should == "txample" end it "raises a TypeError when the passed argument can't be coerced to Integer" do lambda { @io.putc(Object.new) }.should raise_error(TypeError) end end describe "StringIO#putc when in append mode" do it "appends to the end of self" do io = StringIO.new("test", "a") io.putc(?t) io.string.should == "testt" end end describe "StringIO#putc when self is not writable" do it "raises an IOError" do io = StringIO.new("test", "r") lambda { io.putc(?a) }.should raise_error(IOError) io = StringIO.new("test") io.close_write lambda { io.putc("t") }.should raise_error(IOError) end end