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

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

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

    it('should read data from a file', function(done) {
      var fs = util.fs();
      var wbuffer = new Uint8Array([1, 2, 3, 4, 5, 6, 7, 8]);
      var rbuffer = new Uint8Array(wbuffer.length);

      fs.open('/myfile', 'w+', function(error, fd) {
        if(error) throw error;
        fs.write(fd, wbuffer, 0, wbuffer.length, 0, function(error, result) {
          if(error) throw error;

          fs.read(fd, rbuffer, 0, rbuffer.length, 0, function(error, result) {
            expect(error).not.to.exist;
            expect(result).to.equal(rbuffer.length);
            expect(wbuffer).to.deep.equal(rbuffer);
            done();
          });
        });
      });
    });

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

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

        fs.write(fd, wbuffer, 0, wbuffer.length, 0, function(error, result) {
          if(error) throw error;

          fs.read(fd, rbuffer, 0, rbuffer.length / 2, undefined, function(error, result) {
            if(error) throw error;

            _result += result;
            fs.read(fd, rbuffer, rbuffer.length / 2, rbuffer.length, undefined, function(error, result) {
              if(error) throw error;
              _result += result;
              expect(error).not.to.exist;
              expect(_result).to.equal(rbuffer.length);
              expect(wbuffer).to.deep.equal(rbuffer);
              done();
            });
          });
        });
      });
    });
  });

});