测试自定义验证 angularjs 指令 [英] To test a custom validation angularjs directive
问题描述
此自定义验证指令是官方 angular 站点上提供的示例.http://docs.angularjs.org/guide/forms它检查文本输入是否为数字格式.
This custom validation directive is an example presented at the official angular site. http://docs.angularjs.org/guide/forms It checks a text input is in number format or not.
var INTEGER_REGEXP = /^\-?\d*$/;
app.directive('integer', function() {
return {
require: 'ngModel',
link: function(scope, elm, attrs, ctrl) {
ctrl.$parsers.unshift(function(viewValue) {
if (INTEGER_REGEXP.test(viewValue)) {
// it is valid
ctrl.$setValidity('integer', true);
return viewValue;
} else {
// it is invalid, return undefined (no model update)
ctrl.$setValidity('integer', false);
return undefined;
}
});
}
};
});
为了对这段代码进行单元测试,我写了这个:
To unit test this code, I wrote this:
describe('directives', function() {
beforeEach(module('exampleDirective'));
describe('integer', function() {
it('should validate an integer', function() {
inject(function($compile, $rootScope) {
var element = angular.element(
'<form name="form">' +
'<input ng-model="someNum" name="someNum" integer>' +
'</form>'
);
$compile(element)($rootScope);
$rootScope.$digest();
element.find('input').val(5);
expect($rootScope.someNum).toEqual(5);
});
});
});
});
然后我得到这个错误:
Expected undefined to equal 5.
Error: Expected undefined to equal 5.
我在各处放置了打印语句以查看发生了什么,看起来该指令从未被调用过.测试这样的简单指令的正确方法是什么?
I put print statements everywhere to see what is going on, and it looks like the directive is never called. What is a proper way to test a simple directive like this?
推荐答案
其他答案的测试应该写成:
The other answer's tests should be written as:
describe('directives', function() {
var $scope, form;
beforeEach(module('exampleDirective'));
beforeEach(inject(function($compile, $rootScope) {
$scope = $rootScope;
var element = angular.element(
'<form name="form">' +
'<input ng-model="model.somenum" name="somenum" integer />' +
'</form>'
);
$scope.model = { somenum: null }
$compile(element)($scope);
form = $scope.form;
}));
describe('integer', function() {
it('should pass with integer', function() {
form.somenum.$setViewValue('3');
$scope.$digest();
expect($scope.model.somenum).toEqual('3');
expect(form.somenum.$valid).toBe(true);
});
it('should not pass with string', function() {
form.somenum.$setViewValue('a');
$scope.$digest();
expect($scope.model.somenum).toBeUndefined();
expect(form.somenum.$valid).toBe(false);
});
});
});
注意 $scope.$digest()
现在在 $setViewValue
之后调用.这会将表单设置为脏"状态,否则它将保持原始"状态,这可能不是您想要的.
Note that $scope.$digest()
now is invoked after $setViewValue
. This sets the form into "dirty" state, otherwise it would remain "pristine", which probably is not what you want.
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