filer/tests/spec/fs.write.spec.js

define(["Filer", "util"], function(Filer, util) {

  describe('fs.write', function() {
    beforeEach(util.setup);
    afterEach(util.cleanup);

    it('should be a function', function() {
      var fs = util.fs();
      expect(fs.write).to.be.a('function');
    });

    it('should write data to a file', function(done) {
      var fs = util.fs();
      var buffer = new Uint8Array([1, 2, 3, 4, 5, 6, 7, 8]);

      fs.open('/myfile', 'w', function(error, fd) {
        if(error) throw error;

        fs.write(fd, buffer, 0, buffer.length, 0, function(error, result) {
          expect(error).not.to.exist;
          expect(result).to.equal(buffer.length);

          fs.stat('/myfile', function(error, result) {
            expect(error).not.to.exist;
            expect(result.type).to.equal('FILE');
            expect(result.size).to.equal(buffer.length);
            done();
          });
        });
      });
    });

    it('should update the current file position', function(done) {
      var fs = util.fs();
      var buffer = new Uint8Array([1, 2, 3, 4, 5, 6, 7, 8]);
      var _result = 0;

      fs.open('/myfile', 'w', function(error, fd) {
        if(error) throw error;

        fs.write(fd, buffer, 0, buffer.length, undefined, function(error, result) {
          if(error) throw error;
          _result += result;

          fs.write(fd, buffer, 0, buffer.length, undefined, function(error, result) {
            if(error) throw error;
            _result += result;

            fs.stat('/myfile', function(error, result) {
              if(error) throw error;
              expect(error).not.to.exist;
              expect(_result).to.equal(2 * buffer.length);
              expect(result.size).to.equal(_result);
              done();
            });
          });
        });
      });
    });
  });

});