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require File.expand_path('../../../spec_helper', __FILE__)
require File.expand_path('../fixtures/classes', __FILE__)
describe "IO#lineno" do
before :each do
@io = IOSpecs.io_fixture "lines.txt"
end
after :each do
@io.close unless @io.closed?
end
it "raises an IOError on a closed stream" do
lambda { IOSpecs.closed_io.lineno }.should raise_error(IOError)
end
it "returns the current line number" do
@io.lineno.should == 0
count = 0
while @io.gets
@io.lineno.should == count += 1
end
@io.rewind
@io.lineno.should == 0
end
end
describe "IO#lineno=" do
before :each do
@io = IOSpecs.io_fixture "lines.txt"
end
after :each do
@io.close unless @io.closed?
end
it "raises an IOError on a closed stream" do
lambda { IOSpecs.closed_io.lineno = 5 }.should raise_error(IOError)
end
it "calls #to_int on a non-numeric argument" do
obj = mock('123')
obj.should_receive(:to_int).and_return(123)
@io.lineno = obj
@io.lineno.should == 123
end
it "truncates a Float argument" do
@io.lineno = 1.5
@io.lineno.should == 1
@io.lineno = 92233.72036854775808
@io.lineno.should == 92233
end
it "raises TypeError on nil argument" do
lambda { @io.lineno = nil }.should raise_error(TypeError)
end
it "sets the current line number to the given value" do
@io.lineno = count = 500
while @io.gets
@io.lineno.should == count += 1
end
@io.rewind
@io.lineno.should == 0
end
it "does not change $." do
original_line = $.
numbers = [-2**30, -2**16, -2**8, -100, -10, -1, 0, 1, 10, 2**8, 2**16, 2**30]
numbers.each do |num|
@io.lineno = num
@io.lineno.should == num
$..should == original_line
end
end
it "does not change $. until next read" do
$. = 0
$..should == 0
@io.lineno = count = 500
$..should == 0
while @io.gets
$..should == count += 1
end
end
end
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