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require File.expand_path('../../fixtures/classes', __FILE__)
describe :io_binwrite, shared: true do
before :each do
@filename = tmp("IO_binwrite_file") + $$.to_s
File.open(@filename, "w") do |file|
file << "012345678901234567890123456789"
end
end
after :each do
rm_r @filename
end
it "coerces the argument to a string using to_s" do
(obj = mock('test')).should_receive(:to_s).and_return('a string')
IO.send(@method, @filename, obj)
end
it "returns the number of bytes written" do
IO.send(@method, @filename, "abcde").should == 5
end
it "creates a file if missing" do
fn = @filename + "xxx"
begin
File.exist?(fn).should be_false
IO.send(@method, fn, "test")
File.exist?(fn).should be_true
ensure
rm_r fn
end
end
it "creates file if missing even if offset given" do
fn = @filename + "xxx"
begin
File.exist?(fn).should be_false
IO.send(@method, fn, "test", 0)
File.exist?(fn).should be_true
ensure
rm_r fn
end
end
it "truncates the file and writes the given string" do
IO.send(@method, @filename, "hello, world!")
File.read(@filename).should == "hello, world!"
end
it "doesn't truncate the file and writes the given string if an offset is given" do
IO.send(@method, @filename, "hello, world!", 0)
File.read(@filename).should == "hello, world!34567890123456789"
IO.send(@method, @filename, "hello, world!", 20)
File.read(@filename).should == "hello, world!3456789hello, world!"
end
it "doesn't truncate and writes at the given offset after passing empty opts" do
IO.send(@method, @filename, "hello world!", 1, {})
File.read(@filename).should == "0hello world!34567890123456789"
end
it "accepts a :mode option" do
IO.send(@method, @filename, "hello, world!", mode: 'a')
File.read(@filename).should == "012345678901234567890123456789hello, world!"
IO.send(@method, @filename, "foo", 2, mode: 'w')
File.read(@filename).should == "\0\0foo"
end
it "raises an error if readonly mode is specified" do
lambda { IO.send(@method, @filename, "abcde", mode: "r") }.should raise_error(IOError)
end
it "truncates if empty :opts provided and offset skipped" do
IO.send(@method, @filename, "hello, world!", {})
File.read(@filename).should == "hello, world!"
end
end
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