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require File.expand_path('../../../spec_helper', __FILE__)
describe "File.truncate" do
before :each do
@name = tmp("test.txt")
touch(@name) { |f| f.write("1234567890") }
end
after :each do
rm_r @name
end
it "truncates a file" do
File.size(@name).should == 10
File.truncate(@name, 5)
File.size(@name).should == 5
File.open(@name, "r") do |f|
f.read(99).should == "12345"
f.eof?.should == true
end
end
it "truncate a file size to 0" do
File.truncate(@name, 0).should == 0
IO.read(@name).should == ""
end
it "truncate a file size to 5" do
File.size(@name).should == 10
File.truncate(@name, 5)
File.size(@name).should == 5
IO.read(@name).should == "12345"
end
it "truncates to a larger file size than the original file" do
File.truncate(@name, 12)
File.size(@name).should == 12
IO.read(@name).should == "1234567890\000\000"
end
it "truncates to the same size as the original file" do
File.truncate(@name, File.size(@name))
File.size(@name).should == 10
IO.read(@name).should == "1234567890"
end
it "raises an Errno::ENOENT if the file does not exist" do
# TODO: missing_file
not_existing_file = tmp("file-does-not-exist-for-sure.txt")
# make sure it doesn't exist for real
rm_r not_existing_file
begin
lambda { File.truncate(not_existing_file, 5) }.should raise_error(Errno::ENOENT)
ensure
rm_r not_existing_file
end
end
it "raises an ArgumentError if not passed two arguments" do
lambda { File.truncate }.should raise_error(ArgumentError)
lambda { File.truncate(@name) }.should raise_error(ArgumentError)
end
platform_is_not :netbsd, :openbsd do
it "raises an Errno::EINVAL if the length argument is not valid" do
lambda { File.truncate(@name, -1) }.should raise_error(Errno::EINVAL) # May fail
end
end
it "raises a TypeError if not passed a String type for the first argument" do
lambda { File.truncate(1, 1) }.should raise_error(TypeError)
end
it "raises a TypeError if not passed an Integer type for the second argument" do
lambda { File.truncate(@name, nil) }.should raise_error(TypeError)
end
ruby_version_is "1.9" do
it "accepts an object that has a #to_path method" do
File.truncate(mock_to_path(@name), 0).should == 0
end
end
end
describe "File#truncate" do
before :each do
@name = tmp("test.txt")
@file = File.open @name, 'w'
@file.write "1234567890"
@file.flush
end
after :each do
@file.close unless @file.closed?
rm_r @name
end
it "does not move the file write pointer to the specified byte offset" do
@file.truncate(3)
@file.write "abc"
@file.close
@name.should have_data("123\x00\x00\x00\x00\x00\x00\x00abc")
end
it "does not move the file read pointer to the specified byte offset" do
File.open(@name, "r+") do |f|
f.read(1).should == "1"
f.truncate(0)
f.read(1).should == nil
end
end
it "truncates a file" do
File.size(@name).should == 10
@file.truncate(5)
File.size(@name).should == 5
File.open(@name, "r") do |f|
f.read(99).should == "12345"
f.eof?.should == true
end
end
it "truncates a file size to 0" do
@file.truncate(0).should == 0
IO.read(@name).should == ""
end
it "truncates a file size to 5" do
File.size(@name).should == 10
@file.truncate(5)
File.size(@name).should == 5
IO.read(@name).should == "12345"
end
it "truncates a file to a larger size than the original file" do
@file.truncate(12)
File.size(@name).should == 12
IO.read(@name).should == "1234567890\000\000"
end
it "truncates a file to the same size as the original file" do
@file.truncate(File.size(@name))
File.size(@name).should == 10
IO.read(@name).should == "1234567890"
end
it "raises an ArgumentError if not passed one argument" do
lambda { @file.truncate }.should raise_error(ArgumentError)
lambda { @file.truncate(1) }.should_not raise_error(ArgumentError)
end
platform_is_not :netbsd do
it "raises an Errno::EINVAL if the length argument is not valid" do
lambda { @file.truncate(-1) }.should raise_error(Errno::EINVAL) # May fail
end
end
it "raises an IOError if file is closed" do
@file.close
@file.closed?.should == true
lambda { @file.truncate(42) }.should raise_error(IOError)
end
it "raises an IOError if file is not opened for writing" do
File.open(@name, 'r') do |file|
lambda { file.truncate(42) }.should raise_error(IOError)
end
end
it "raises a TypeError if not passed an Integer type for the for the argument" do
lambda { @file.truncate(nil) }.should raise_error(TypeError)
end
end
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