old_contents: var v = require( '../../src/validation' )();
  
  describe( 'validation/index.js', function () {
      describe( 'validateField', function () {
          var fldID   = 'test';
          var fldMeta = { renderer: 'text', validators: [] };
  
          it( 'should return `null` instead of errors array if `validators` are unset', function () {
              expect( v.validateField( fldID, fldMeta, null ) )
                  .toEqual({ 'test': null });
          });
  
          it2( 'should return array with errors if `validators`', 
              'are set and value is not valid', function () {
              var validators = [{ rule: 'required', message: 'err' }];
              fldMeta.validators = validators;
  
              expect( v.validateField( fldID, fldMeta, null ) )
                  .toEqual({ 'test': validators });
          });
          
          it2( 'should return array with only errors ',
               'from failed validators', function () {
              var validators = [{ rule: 'required', message: 'err1' },
                                { rule: 'length', value: 5, message: 'err2' }];
              fldMeta.validators = validators;
  
              expect( v.validateField( fldID, fldMeta, 'test' ) )
                  .toEqual({ 'test': [ validators[1] ] });
  
              expect( v.validateField( fldID, fldMeta, null ) )
                  .toEqual({ 'test': validators });
          });
      });
  });
  
  
  function ms () {
      return Array.prototype.join.call( arguments, '' );
  }
  
  function it2 () {
      var ss = Array.prototype.slice.call( arguments, 0, -1 );
      var fn = Array.prototype.slice.call( arguments, -1 )[ 0 ];
      
      return it(ms.apply( null, ss ), fn );
  }
  
new_contents: var v = require( '../../src/validation' )();
  
  describe( 'validation/index.js', function () {
      describe( 'validateField', function () {
          var fldID   = 'test';
          var fldMeta = { renderer: 'text', validators: [] };
  
          it2( 'should return `null` instead of errors array if ',
              '`validators` are unset', function () {
              expect( v.validateField( fldID, fldMeta, null ) )
                  .toEqual({ 'test': null });
          });
  
          it2( 'should return array with errors if `validators` ', 
               'are set and value is not valid', function () {
              var validators = [{ rule: 'required', message: 'err' }];
              fldMeta.validators = validators;
  
              expect( v.validateField( fldID, fldMeta, null ) )
                  .toEqual({ 'test': validators });
          });
          
          it2( 'should return array with only errors ',
               'from failed validators', function () {
              var validators = [{ rule: 'required', message: 'err1' },
                                { rule: 'length', value: 5, message: 'err2' }];
              fldMeta.validators = validators;
  
              expect( v.validateField( fldID, fldMeta, 'test' ) )
                  .toEqual({ 'test': [ validators[1] ] });
  
              expect( v.validateField( fldID, fldMeta, null ) )
                  .toEqual({ 'test': validators });
          });
      });
  });
  
  
  function ms () {
      return Array.prototype.join.call( arguments, '' );
  }
  
  function it2 () {
      var ss = Array.prototype.slice.call( arguments, 0, -1 );
      var fn = Array.prototype.slice.call( arguments, -1 )[ 0 ];
      
      return it(ms.apply( null, ss ), fn );
  }
  
subject: Update unit-test of validation