require_relative '../../spec_helper' require_relative 'fixtures/classes' describe "StringIO#seek" do before :each do @io = StringIO.new("12345678") end it "seeks from the current position when whence is IO::SEEK_CUR" do @io.pos = 1 @io.seek(1, IO::SEEK_CUR) @io.pos.should eql(2) @io.seek(-1, IO::SEEK_CUR) @io.pos.should eql(1) end it "seeks from the end of self when whence is IO::SEEK_END" do @io.seek(3, IO::SEEK_END) @io.pos.should eql(11) # Outside of the StringIO's content @io.seek(-2, IO::SEEK_END) @io.pos.should eql(6) end it "seeks to an absolute position when whence is IO::SEEK_SET" do @io.seek(5, IO::SEEK_SET) @io.pos.should == 5 @io.pos = 3 @io.seek(5, IO::SEEK_SET) @io.pos.should == 5 end it "raises an Errno::EINVAL error on negative amounts when whence is IO::SEEK_SET" do -> { @io.seek(-5, IO::SEEK_SET) }.should raise_error(Errno::EINVAL) end it "raises an Errno::EINVAL error on incorrect whence argument" do -> { @io.seek(0, 3) }.should raise_error(Errno::EINVAL) -> { @io.seek(0, -1) }.should raise_error(Errno::EINVAL) -> { @io.seek(0, 2**16) }.should raise_error(Errno::EINVAL) -> { @io.seek(0, -2**16) }.should raise_error(Errno::EINVAL) end it "tries to convert the passed Object to a String using #to_int" do obj = mock("to_int") obj.should_receive(:to_int).and_return(2) @io.seek(obj) @io.pos.should eql(2) end it "raises a TypeError when the passed Object can't be converted to an Integer" do -> { @io.seek(Object.new) }.should raise_error(TypeError) end end describe "StringIO#seek when self is closed" do before :each do @io = StringIO.new("example") @io.close end it "raises an IOError" do -> { @io.seek(5) }.should raise_error(IOError) end end