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

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

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

    it('should error when path is wrong to readFile', function(done) {
      var fs = util.fs();
      var contents = "This is a file.";

      fs.readFile('/no-such-file', 'utf8', function(error, data) {
        expect(error).to.exist;
        expect(data).not.to.exist;
        done();
      });
    });

    it('should write, read a utf8 file without specifying utf8 in writeFile', function(done) {
      var fs = util.fs();
      var contents = "This is a file.";

      fs.writeFile('/myfile', contents, function(error) {
        if(error) throw error;
        fs.readFile('/myfile', 'utf8', function(error, data) {
          expect(error).not.to.exist;
          expect(data).to.equal(contents);
          done();
        });
      });
    });

    it('should write, read a utf8 file with "utf8" option to writeFile', function(done) {
      var fs = util.fs();
      var contents = "This is a file.";

      fs.writeFile('/myfile', contents, 'utf8', function(error) {
        if(error) throw error;
        fs.readFile('/myfile', 'utf8', function(error, data) {
          expect(error).not.to.exist;
          expect(data).to.equal(contents);
          done();
        });
      });
    });

    it('should write, read a utf8 file with {encoding: "utf8"} option to writeFile', function(done) {
      var fs = util.fs();
      var contents = "This is a file.";

      fs.writeFile('/myfile', contents, { encoding: 'utf8' }, function(error) {
        if(error) throw error;
        fs.readFile('/myfile', 'utf8', function(error, data) {
          expect(error).not.to.exist;
          expect(data).to.equal(contents);
          done();
        });
      });
    });

    it('should write, read a binary file', function(done) {
      var fs = util.fs();
      // String and utf8 binary encoded versions of the same thing:
      var contents = "This is a file.";
      var binary = new Uint8Array([84, 104, 105, 115, 32, 105, 115, 32, 97, 32, 102, 105, 108, 101, 46]);

      fs.writeFile('/myfile', binary, function(error) {
        if(error) throw error;
        fs.readFile('/myfile', function(error, data) {
          expect(error).not.to.exist;
          expect(data).to.deep.equal(binary);
          done();
        });
      });
    });

    it('should follow symbolic links', function(done) {
      var fs = util.fs();
      var contents = "This is a file.";

      fs.writeFile('/myfile', '', { encoding: 'utf8' }, function(error) {
        if(error) throw error;
        fs.symlink('/myfile', '/myFileLink', function (error) {
          if (error) throw error;
          fs.writeFile('/myFileLink', contents, 'utf8', function (error) {
            if (error) throw error;
            fs.readFile('/myFileLink', 'utf8', function(error, data) {
              expect(error).not.to.exist;
              expect(data).to.equal(contents);
              done();
            });
          });
        });
      });
    });
  });

});