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require_relative '../../spec_helper'
require_relative 'fixtures/classes'
describe "StringIO#<< when passed [Object]" do
before :each do
@io = StringIO.new(+"example")
end
it "returns self" do
(@io << "just testing").should equal(@io)
end
it "writes the passed argument onto self" do
(@io << "just testing")
@io.string.should == "just testing"
(@io << " and more testing")
@io.string.should == "just testing and more testing"
end
it "writes the passed argument at the current position" do
@io.pos = 5
@io << "<test>"
@io.string.should == "examp<test>"
end
it "pads self with \\000 when the current position is after the end" do
@io.pos = 15
@io << "just testing"
@io.string.should == "example\000\000\000\000\000\000\000\000just testing"
end
it "updates self's position" do
@io << "test"
@io.pos.should eql(4)
end
it "tries to convert the passed argument to a String using #to_s" do
obj = mock("to_s")
obj.should_receive(:to_s).and_return("Test")
(@io << obj).string.should == "Testple"
end
end
describe "StringIO#<< when self is not writable" do
it "raises an IOError" do
io = StringIO.new(+"test", "r")
-> { io << "test" }.should raise_error(IOError)
io = StringIO.new(+"test")
io.close_write
-> { io << "test" }.should raise_error(IOError)
end
end
describe "StringIO#<< when in append mode" do
before :each do
@io = StringIO.new(+"example", "a")
end
it "appends the passed argument to the end of self, ignoring current position" do
(@io << ", just testing")
@io.string.should == "example, just testing"
@io.pos = 3
(@io << " and more testing")
@io.string.should == "example, just testing and more testing"
end
it "correctly updates self's position" do
@io << ", testing"
@io.pos.should eql(16)
end
end
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