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require File.expand_path('../../../spec_helper', __FILE__)
require File.expand_path('../fixtures/classes', __FILE__)
require File.expand_path('../shared/write', __FILE__)
describe "IO#syswrite on a file" do
before :each do
@filename = tmp("IO_syswrite_file") + $$.to_s
File.open(@filename, "w") do |file|
file.syswrite("012345678901234567890123456789")
end
@file = File.open(@filename, "r+")
@readonly_file = File.open(@filename)
end
after :each do
@file.close
@readonly_file.close
rm_r @filename
end
it "writes all of the string's bytes but does not buffer them" do
written = @file.syswrite("abcde")
written.should == 5
File.open(@filename) do |file|
file.sysread(10).should == "abcde56789"
file.seek(0)
@file.fsync
file.sysread(10).should == "abcde56789"
end
end
it "warns if called immediately after a buffered IO#write" do
@file.write("abcde")
lambda { @file.syswrite("fghij") }.should complain(/syswrite/)
end
it "does not warn if called after IO#write with intervening IO#sysread" do
@file.syswrite("abcde")
@file.sysread(5)
lambda { @file.syswrite("fghij") }.should_not complain
end
it "writes to the actual file position when called after buffered IO#read" do
@file.read(5)
@file.syswrite("abcde")
File.open(@filename) do |file|
file.sysread(10).should == "01234abcde"
end
end
end
describe "IO#syswrite" do
it_behaves_like :io_write, :syswrite
end
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