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require File.expand_path('../../../spec_helper', __FILE__)
require File.expand_path('../fixtures/classes', __FILE__)
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
lambda { @io.seek(-5, IO::SEEK_SET) }.should raise_error(Errno::EINVAL)
end
it "raises an Errno::EINVAL error on incorrect whence argument" do
lambda { @io.seek(0, 3) }.should raise_error(Errno::EINVAL)
lambda { @io.seek(0, -1) }.should raise_error(Errno::EINVAL)
lambda { @io.seek(0, 2**16) }.should raise_error(Errno::EINVAL)
lambda { @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
lambda { @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
lambda { @io.seek(5) }.should raise_error(IOError)
end
end
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