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

  describe('FileSystemShell.cat', function() {
    beforeEach(util.setup);
    afterEach(util.cleanup);

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

    it('should fail when files argument is absent', function(done) {
      var fs = util.fs();
      var shell = fs.Shell();

      shell.cat(null, function(error, data) {
        expect(error).to.exist;
        expect(data).not.to.exist;
        done();
      });
    });

    it('should return the contents of a single file', function(done) {
      var fs = util.fs();
      var shell = fs.Shell();
      var contents = "file contents";

      fs.writeFile('/file', contents, function(err) {
        if(err) throw err;

        shell.cat('/file', function(err, data) {
          expect(err).not.to.exist;
          expect(data).to.equal(contents);
          done();
        });
      });
    });

    it('should return the contents of multiple files', function(done) {
      var fs = util.fs();
      var shell = fs.Shell();
      var contents = "file contents";
      var contents2 = contents + '\n' + contents;

      fs.writeFile('/file', contents, function(err) {
        if(err) throw err;

        fs.writeFile('/file2', contents2, function(err) {
          if(err) throw err;

          shell.cat(['/file', '/file2'], function(err, data) {
            expect(err).not.to.exist;
            expect(data).to.equal(contents + '\n' + contents2);
            done();
          });
        });
      });
    });

    it('should fail if any of multiple file paths is invalid', function(done) {
      var fs = util.fs();
      var shell = fs.Shell();
      var contents = "file contents";
      var contents2 = contents + '\n' + contents;

      fs.writeFile('/file', contents, function(err) {
        if(err) throw err;

        fs.writeFile('/file2', contents2, function(err) {
          if(err) throw err;

          shell.cat(['/file', '/nofile'], function(err, data) {
            expect(err).to.exist;
            expect(data).not.to.exist;
            done();
          });
        });
      });
    });

  });
});