text: 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(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 = 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(err.code).to.equal("ENOENT");
              expect(data).not.to.exist;
              done();
            });
          });
        });
      });
  
    });
  });
  