require_relative '../../spec_helper' 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 it "accepts an object that has a #to_path method" do File.truncate(mock_to_path(@name), 0).should == 0 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 File.read(@name).should == "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