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require_relative '../../spec_helper'
require_relative 'fixtures/classes'
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
-> { @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
-> { io.ungetc(?A) }.should raise_error(IOError)
io = StringIO.new("test")
io.pos = 1
io.close_read
-> { 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
|
