text: var util = require('../../lib/test-utils.js');
  var expect = require('chai').expect;
  
  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 = new fs.Shell();
  
      shell.cat(null, function(error, data) {
        expect(error).to.exist;
        expect(error.code).to.equal('EINVAL');
        expect(data).not.to.exist;
        done();
      });
    });
  
    it('should return the contents of a single file', function(done) {
      var fs = util.fs();
      var shell = new 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 = new 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 = new 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(err.code).to.equal('ENOENT');
            expect(data).not.to.exist;
            done();
          });
        });
      });
    });
  });
  