spec/frozen/1.8/core/io/syswrite_spec.rb

   1 require File.dirname(__FILE__) + '/../../spec_helper'
   2 require File.dirname(__FILE__) + '/fixtures/classes'
   3 require File.dirname(__FILE__) + '/shared/write'
   4
   5 describe "IO#syswrite on a file" do
   6   before :each do
   7     @filename = tmp("IO_syswrite_file") + $$.to_s
   8     File.open(@filename, "w") do |file|
   9       file.syswrite("012345678901234567890123456789")
  10     end
  11     @file = File.open(@filename, "r+")
  12     @readonly_file = File.open(@filename)
  13   end
  14
  15   after :each do
  16     @file.close
  17     @readonly_file.close
  18     File.delete(@filename)
  19   end
  20
  21   it "writes all of the string's bytes but does not buffer them" do
  22     written = @file.syswrite("abcde")
  23     written.should == 5
  24     File.open(@filename) do |file|
  25       file.sysread(10).should == "abcde56789"
  26       file.seek(0)
  27       @file.fsync
  28       file.sysread(10).should == "abcde56789"
  29     end
  30   end
  31
  32   not_compliant_on :rubinius do
  33     it "warns if called immediately after a buffered IO#write" do
  34       @file.write("abcde")
  35       lambda { @file.syswrite("fghij") }.should complain(/syswrite/)
  36     end
  37   end
  38
  39   it "does not warn if called after IO#write with intervening IO#sysread" do
  40     @file.syswrite("abcde")
  41     @file.sysread(5)
  42     lambda { @file.syswrite("fghij") }.should_not complain
  43   end
  44
  45   it "writes to the actual file position when called after buffered IO#read" do
  46     @file.read(5)
  47     @file.syswrite("abcde")
  48     File.open(@filename) do |file|
  49       file.sysread(10).should == "01234abcde"
  50     end
  51   end
  52
  53   it_behaves_like(:io_write, :syswrite)
  54 end