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rootScopeSpec.js
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2195 lines (1705 loc) · 69.7 KB
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'use strict';
describe('Scope', function() {
beforeEach(module(provideLog));
describe('$root', function() {
it('should point to itself', inject(function($rootScope) {
expect($rootScope.$root).toEqual($rootScope);
expect($rootScope.hasOwnProperty('$root')).toBeTruthy();
}));
it('should expose the constructor', inject(function($rootScope) {
/* jshint -W103 */
if (msie < 11) return;
expect($rootScope.__proto__).toBe($rootScope.constructor.prototype);
}));
it('should not have $root on children, but should inherit', inject(function($rootScope) {
var child = $rootScope.$new();
expect(child.$root).toEqual($rootScope);
expect(child.hasOwnProperty('$root')).toBeFalsy();
}));
});
describe('$parent', function() {
it('should point to itself in root', inject(function($rootScope) {
expect($rootScope.$root).toEqual($rootScope);
}));
it('should point to parent', inject(function($rootScope) {
var child = $rootScope.$new();
expect($rootScope.$parent).toEqual(null);
expect(child.$parent).toEqual($rootScope);
expect(child.$new().$parent).toEqual(child);
}));
});
describe('$id', function() {
it('should have a unique id', inject(function($rootScope) {
expect($rootScope.$id < $rootScope.$new().$id).toBeTruthy();
}));
});
describe('this', function() {
it('should evaluate \'this\' to be the scope', inject(function($rootScope) {
var child = $rootScope.$new();
expect($rootScope.$eval('this')).toEqual($rootScope);
expect(child.$eval('this')).toEqual(child);
}));
it('\'this\' should not be recursive', inject(function($rootScope) {
expect($rootScope.$eval('this.this')).toBeUndefined();
expect($rootScope.$eval('$parent.this')).toBeUndefined();
}));
it('should not be able to overwrite the \'this\' keyword', inject(function($rootScope) {
$rootScope['this'] = 123;
expect($rootScope.$eval('this')).toEqual($rootScope);
}));
it('should be able to access a variable named \'this\'', inject(function($rootScope) {
$rootScope['this'] = 42;
expect($rootScope.$eval('this[\'this\']')).toBe(42);
}));
});
describe('$new()', function() {
it('should create a child scope', inject(function($rootScope) {
var child = $rootScope.$new();
$rootScope.a = 123;
expect(child.a).toEqual(123);
}));
it('should create a non prototypically inherited child scope', inject(function($rootScope) {
var child = $rootScope.$new(true);
$rootScope.a = 123;
expect(child.a).toBeUndefined();
expect(child.$parent).toEqual($rootScope);
expect(child.$new).toBe($rootScope.$new);
expect(child.$root).toBe($rootScope);
}));
it("should attach the child scope to a specified parent", inject(function($rootScope) {
var isolated = $rootScope.$new(true);
var trans = $rootScope.$new(false, isolated);
$rootScope.a = 123;
expect(isolated.a).toBeUndefined();
expect(trans.a).toEqual(123);
expect(trans.$parent).toBe(isolated);
}));
});
describe('$watch/$digest', function() {
it('should watch and fire on simple property change', inject(function($rootScope) {
var spy = jasmine.createSpy();
$rootScope.$watch('name', spy);
$rootScope.$digest();
spy.calls.reset();
expect(spy).not.toHaveBeenCalled();
$rootScope.$digest();
expect(spy).not.toHaveBeenCalled();
$rootScope.name = 'misko';
$rootScope.$digest();
expect(spy).toHaveBeenCalledWith('misko', undefined, $rootScope);
}));
it('should not expose the `inner working of watch', inject(function($rootScope) {
function Getter() {
expect(this).toBeUndefined();
return 'foo';
}
function Listener() {
expect(this).toBeUndefined();
}
if (msie < 10) return;
$rootScope.$watch(Getter, Listener);
$rootScope.$digest();
}));
it('should watch and fire on expression change', inject(function($rootScope) {
var spy = jasmine.createSpy();
$rootScope.$watch('name.first', spy);
$rootScope.$digest();
spy.calls.reset();
$rootScope.name = {};
expect(spy).not.toHaveBeenCalled();
$rootScope.$digest();
expect(spy).not.toHaveBeenCalled();
$rootScope.name.first = 'misko';
$rootScope.$digest();
expect(spy).toHaveBeenCalled();
}));
it('should not keep constant expressions on watch queue', inject(function($rootScope) {
$rootScope.$watch('1 + 1', function() {});
expect($rootScope.$$watchers.length).toEqual(1);
expect($rootScope.$$watchersCount).toEqual(1);
$rootScope.$digest();
expect($rootScope.$$watchers.length).toEqual(0);
expect($rootScope.$$watchersCount).toEqual(0);
}));
it('should decrement the watcherCount when destroying a child scope', inject(function($rootScope) {
var child1 = $rootScope.$new(),
child2 = $rootScope.$new(),
grandChild1 = child1.$new(),
grandChild2 = child2.$new();
child1.$watch('a', function() {});
child2.$watch('a', function() {});
grandChild1.$watch('a', function() {});
grandChild2.$watch('a', function() {});
expect($rootScope.$$watchersCount).toBe(4);
expect(child1.$$watchersCount).toBe(2);
expect(child2.$$watchersCount).toBe(2);
expect(grandChild1.$$watchersCount).toBe(1);
expect(grandChild2.$$watchersCount).toBe(1);
grandChild2.$destroy();
expect(child2.$$watchersCount).toBe(1);
expect($rootScope.$$watchersCount).toBe(3);
child1.$destroy();
expect($rootScope.$$watchersCount).toBe(1);
}));
it('should decrement the watcherCount when calling the remove function', inject(function($rootScope) {
var child1 = $rootScope.$new(),
child2 = $rootScope.$new(),
grandChild1 = child1.$new(),
grandChild2 = child2.$new(),
remove1,
remove2;
remove1 = child1.$watch('a', function() {});
child2.$watch('a', function() {});
grandChild1.$watch('a', function() {});
remove2 = grandChild2.$watch('a', function() {});
remove2();
expect(grandChild2.$$watchersCount).toBe(0);
expect(child2.$$watchersCount).toBe(1);
expect($rootScope.$$watchersCount).toBe(3);
remove1();
expect(grandChild1.$$watchersCount).toBe(1);
expect(child1.$$watchersCount).toBe(1);
expect($rootScope.$$watchersCount).toBe(2);
// Execute everything a second time to be sure that calling the remove function
// several times, it only decrements the counter once
remove2();
expect(child2.$$watchersCount).toBe(1);
expect($rootScope.$$watchersCount).toBe(2);
remove1();
expect(child1.$$watchersCount).toBe(1);
expect($rootScope.$$watchersCount).toBe(2);
}));
it('should not keep constant literals on the watch queue', inject(function($rootScope) {
$rootScope.$watch('[]', function() {});
$rootScope.$watch('{}', function() {});
expect($rootScope.$$watchers.length).toEqual(2);
$rootScope.$digest();
expect($rootScope.$$watchers.length).toEqual(0);
}));
it('should clean up stable watches on the watch queue', inject(function($rootScope) {
$rootScope.$watch('::foo', function() {});
expect($rootScope.$$watchers.length).toEqual(1);
$rootScope.$digest();
expect($rootScope.$$watchers.length).toEqual(1);
$rootScope.foo = 'foo';
$rootScope.$digest();
expect($rootScope.$$watchers.length).toEqual(0);
}));
it('should clean up stable watches from $watchCollection', inject(function($rootScope) {
$rootScope.$watchCollection('::foo', function() {});
expect($rootScope.$$watchers.length).toEqual(1);
$rootScope.$digest();
expect($rootScope.$$watchers.length).toEqual(1);
$rootScope.foo = [];
$rootScope.$digest();
expect($rootScope.$$watchers.length).toEqual(0);
}));
it('should clean up stable watches from $watchGroup', inject(function($rootScope) {
$rootScope.$watchGroup(['::foo', '::bar'], function() {});
expect($rootScope.$$watchers.length).toEqual(2);
$rootScope.$digest();
expect($rootScope.$$watchers.length).toEqual(2);
$rootScope.foo = 'foo';
$rootScope.$digest();
expect($rootScope.$$watchers.length).toEqual(1);
$rootScope.bar = 'bar';
$rootScope.$digest();
expect($rootScope.$$watchers.length).toEqual(0);
}));
it('should delegate exceptions', function() {
module(function($exceptionHandlerProvider) {
$exceptionHandlerProvider.mode('log');
});
inject(function($rootScope, $exceptionHandler, $log) {
$rootScope.$watch('a', function() {throw new Error('abc');});
$rootScope.a = 1;
$rootScope.$digest();
expect($exceptionHandler.errors[0].message).toEqual('abc');
$log.assertEmpty();
});
});
it('should fire watches in order of addition', inject(function($rootScope) {
// this is not an external guarantee, just our own sanity
var log = '';
$rootScope.$watch('a', function() { log += 'a'; });
$rootScope.$watch('b', function() { log += 'b'; });
// constant expressions have slightly different handling,
// let's ensure they are kept in the same list as others
$rootScope.$watch('1', function() { log += '1'; });
$rootScope.$watch('c', function() { log += 'c'; });
$rootScope.$watch('2', function() { log += '2'; });
$rootScope.a = $rootScope.b = $rootScope.c = 1;
$rootScope.$digest();
expect(log).toEqual('ab1c2');
}));
it('should call child $watchers in addition order', inject(function($rootScope) {
// this is not an external guarantee, just our own sanity
var log = '';
var childA = $rootScope.$new();
var childB = $rootScope.$new();
var childC = $rootScope.$new();
childA.$watch('a', function() { log += 'a'; });
childB.$watch('b', function() { log += 'b'; });
childC.$watch('c', function() { log += 'c'; });
childA.a = childB.b = childC.c = 1;
$rootScope.$digest();
expect(log).toEqual('abc');
}));
it('should allow $digest on a child scope with and without a right sibling', inject(
function($rootScope) {
// tests a traversal edge case which we originally missed
var log = '',
childA = $rootScope.$new(),
childB = $rootScope.$new();
$rootScope.$watch(function() { log += 'r'; });
childA.$watch(function() { log += 'a'; });
childB.$watch(function() { log += 'b'; });
// init
$rootScope.$digest();
expect(log).toBe('rabrab');
log = '';
childA.$digest();
expect(log).toBe('a');
log = '';
childB.$digest();
expect(log).toBe('b');
}));
it('should repeat watch cycle while model changes are identified', inject(function($rootScope) {
var log = '';
$rootScope.$watch('c', function(v) {$rootScope.d = v; log+='c'; });
$rootScope.$watch('b', function(v) {$rootScope.c = v; log+='b'; });
$rootScope.$watch('a', function(v) {$rootScope.b = v; log+='a'; });
$rootScope.$digest();
log = '';
$rootScope.a = 1;
$rootScope.$digest();
expect($rootScope.b).toEqual(1);
expect($rootScope.c).toEqual(1);
expect($rootScope.d).toEqual(1);
expect(log).toEqual('abc');
}));
it('should repeat watch cycle from the root element', inject(function($rootScope) {
var log = '';
var child = $rootScope.$new();
$rootScope.$watch(function() { log += 'a'; });
child.$watch(function() { log += 'b'; });
$rootScope.$digest();
expect(log).toEqual('abab');
}));
it('should prevent infinite recursion and print watcher expression',function() {
module(function($rootScopeProvider) {
$rootScopeProvider.digestTtl(100);
});
inject(function($rootScope) {
$rootScope.$watch('a', function() {$rootScope.b++;});
$rootScope.$watch('b', function() {$rootScope.a++;});
$rootScope.a = $rootScope.b = 0;
expect(function() {
$rootScope.$digest();
}).toThrowMinErr('$rootScope', 'infdig', '100 $digest() iterations reached. Aborting!\n' +
'Watchers fired in the last 5 iterations: ' +
'[[{"msg":"a","newVal":96,"oldVal":95},{"msg":"b","newVal":97,"oldVal":96}],' +
'[{"msg":"a","newVal":97,"oldVal":96},{"msg":"b","newVal":98,"oldVal":97}],' +
'[{"msg":"a","newVal":98,"oldVal":97},{"msg":"b","newVal":99,"oldVal":98}],' +
'[{"msg":"a","newVal":99,"oldVal":98},{"msg":"b","newVal":100,"oldVal":99}],' +
'[{"msg":"a","newVal":100,"oldVal":99},{"msg":"b","newVal":101,"oldVal":100}]]');
expect($rootScope.$$phase).toBeNull();
});
});
it('should prevent infinite recursion and print watcher function name or body',
inject(function($rootScope) {
$rootScope.$watch(function watcherA() {return $rootScope.a;}, function() {$rootScope.b++;});
$rootScope.$watch(function() {return $rootScope.b;}, function() {$rootScope.a++;});
$rootScope.a = $rootScope.b = 0;
try {
$rootScope.$digest();
throw new Error('Should have thrown exception');
} catch (e) {
expect(e.message.match(/"fn: (watcherA|function)/g).length).toBe(10);
}
}));
it('should prevent infinite loop when creating and resolving a promise in a watched expression', function() {
module(function($rootScopeProvider) {
$rootScopeProvider.digestTtl(10);
});
inject(function($rootScope, $q) {
var d = $q.defer();
d.resolve('Hello, world.');
$rootScope.$watch(function() {
var $d2 = $q.defer();
$d2.resolve('Goodbye.');
$d2.promise.then(function() { });
return d.promise;
}, function() { return 0; });
expect(function() {
$rootScope.$digest();
}).toThrowMinErr('$rootScope', 'infdig', '10 $digest() iterations reached. Aborting!\n' +
'Watchers fired in the last 5 iterations: []');
expect($rootScope.$$phase).toBeNull();
});
});
it('should not fire upon $watch registration on initial $digest', inject(function($rootScope) {
var log = '';
$rootScope.a = 1;
$rootScope.$watch('a', function() { log += 'a'; });
$rootScope.$watch('b', function() { log += 'b'; });
$rootScope.$digest();
log = '';
$rootScope.$digest();
expect(log).toEqual('');
}));
it('should watch objects', inject(function($rootScope) {
var log = '';
$rootScope.a = [];
$rootScope.b = {};
$rootScope.$watch('a', function(value) {
log +='.';
expect(value).toBe($rootScope.a);
}, true);
$rootScope.$watch('b', function(value) {
log +='!';
expect(value).toBe($rootScope.b);
}, true);
$rootScope.$digest();
log = '';
$rootScope.a.push({});
$rootScope.b.name = '';
$rootScope.$digest();
expect(log).toEqual('.!');
}));
it('should watch functions', function() {
module(provideLog);
inject(function($rootScope, log) {
$rootScope.fn = function() {return 'a';};
$rootScope.$watch('fn', function(fn) {
log(fn());
});
$rootScope.$digest();
expect(log).toEqual('a');
$rootScope.fn = function() {return 'b';};
$rootScope.$digest();
expect(log).toEqual('a; b');
});
});
it('should prevent $digest recursion', inject(function($rootScope) {
var callCount = 0;
$rootScope.$watch('name', function() {
expect(function() {
$rootScope.$digest();
}).toThrowMinErr('$rootScope', 'inprog', '$digest already in progress');
callCount++;
});
$rootScope.name = 'a';
$rootScope.$digest();
expect(callCount).toEqual(1);
}));
it('should allow a watch to be added while in a digest', inject(function($rootScope) {
var watch1 = jasmine.createSpy('watch1'),
watch2 = jasmine.createSpy('watch2');
$rootScope.$watch('foo', function() {
$rootScope.$watch('foo', watch1);
$rootScope.$watch('foo', watch2);
});
$rootScope.$apply('foo = true');
expect(watch1).toHaveBeenCalled();
expect(watch2).toHaveBeenCalled();
}));
it('should not infinitely digest when current value is NaN', inject(function($rootScope) {
$rootScope.$watch(function() { return NaN;});
expect(function() {
$rootScope.$digest();
}).not.toThrow();
}));
it('should always call the watcher with newVal and oldVal equal on the first run',
inject(function($rootScope) {
var log = [];
function logger(scope, newVal, oldVal) {
var val = (newVal === oldVal || (newVal !== oldVal && oldVal !== newVal)) ? newVal : 'xxx';
log.push(val);
}
$rootScope.$watch(function() { return NaN;}, logger);
$rootScope.$watch(function() { return undefined;}, logger);
$rootScope.$watch(function() { return '';}, logger);
$rootScope.$watch(function() { return false;}, logger);
$rootScope.$watch(function() { return {};}, logger, true);
$rootScope.$watch(function() { return 23;}, logger);
$rootScope.$digest();
expect(isNaN(log.shift())).toBe(true); //jasmine's toBe and toEqual don't work well with NaNs
expect(log).toEqual([undefined, '', false, {}, 23]);
log = [];
$rootScope.$digest();
expect(log).toEqual([]);
}));
describe('$watch deregistration', function() {
it('should return a function that allows listeners to be deregistered', inject(
function($rootScope) {
var listener = jasmine.createSpy('watch listener'),
listenerRemove;
listenerRemove = $rootScope.$watch('foo', listener);
$rootScope.$digest(); //init
expect(listener).toHaveBeenCalled();
expect(listenerRemove).toBeDefined();
listener.calls.reset();
$rootScope.foo = 'bar';
$rootScope.$digest(); //triger
expect(listener).toHaveBeenCalledOnce();
listener.calls.reset();
$rootScope.foo = 'baz';
listenerRemove();
$rootScope.$digest(); //trigger
expect(listener).not.toHaveBeenCalled();
}));
it('should allow a watch to be deregistered while in a digest', inject(function($rootScope) {
var remove1, remove2;
$rootScope.$watch('remove', function() {
remove1();
remove2();
});
remove1 = $rootScope.$watch('thing', function() {});
remove2 = $rootScope.$watch('thing', function() {});
expect(function() {
$rootScope.$apply('remove = true');
}).not.toThrow();
}));
it('should not mess up the digest loop if deregistration happens during digest', inject(
function($rootScope, log) {
// we are testing this due to regression #5525 which is related to how the digest loops lastDirtyWatch
// short-circuiting optimization works
// scenario: watch1 deregistering watch1
var scope = $rootScope.$new();
var deregWatch1 = scope.$watch(log.fn('watch1'), function() { deregWatch1(); log('watchAction1'); });
scope.$watch(log.fn('watch2'), log.fn('watchAction2'));
scope.$watch(log.fn('watch3'), log.fn('watchAction3'));
$rootScope.$digest();
expect(log).toEqual(['watch1', 'watchAction1', 'watch2', 'watchAction2', 'watch3', 'watchAction3',
'watch2', 'watch3']);
scope.$destroy();
log.reset();
// scenario: watch1 deregistering watch2
scope = $rootScope.$new();
scope.$watch(log.fn('watch1'), function() { deregWatch2(); log('watchAction1'); });
var deregWatch2 = scope.$watch(log.fn('watch2'), log.fn('watchAction2'));
scope.$watch(log.fn('watch3'), log.fn('watchAction3'));
$rootScope.$digest();
expect(log).toEqual(['watch1', 'watchAction1', 'watch1', 'watch3', 'watchAction3',
'watch1', 'watch3']);
scope.$destroy();
log.reset();
// scenario: watch2 deregistering watch1
scope = $rootScope.$new();
deregWatch1 = scope.$watch(log.fn('watch1'), log.fn('watchAction1'));
scope.$watch(log.fn('watch2'), function() { deregWatch1(); log('watchAction2'); });
scope.$watch(log.fn('watch3'), log.fn('watchAction3'));
$rootScope.$digest();
expect(log).toEqual(['watch1', 'watchAction1', 'watch2', 'watchAction2', 'watch3', 'watchAction3',
'watch2', 'watch3']);
}));
});
describe('$watchCollection', function() {
var log, $rootScope, deregister;
beforeEach(inject(function(_$rootScope_, _log_) {
$rootScope = _$rootScope_;
log = _log_;
deregister = $rootScope.$watchCollection('obj', function logger(newVal, oldVal) {
var msg = {newVal: newVal, oldVal: oldVal};
if (newVal === oldVal) {
msg.identical = true;
}
log(msg);
});
}));
it('should not trigger if nothing change', inject(function($rootScope) {
$rootScope.$digest();
expect(log).toEqual([{ newVal: undefined, oldVal: undefined, identical: true }]);
log.reset();
$rootScope.$digest();
expect(log).toEqual([]);
}));
it('should allow deregistration', function() {
$rootScope.obj = [];
$rootScope.$digest();
expect(log.toArray().length).toBe(1);
log.reset();
$rootScope.obj.push('a');
deregister();
$rootScope.$digest();
expect(log).toEqual([]);
});
describe('array', function() {
it('should return oldCollection === newCollection only on the first listener call',
inject(function($rootScope, log) {
// first time should be identical
$rootScope.obj = ['a', 'b'];
$rootScope.$digest();
expect(log).toEqual([{newVal: ['a', 'b'], oldVal: ['a', 'b'], identical: true}]);
log.reset();
// second time should be different
$rootScope.obj[1] = 'c';
$rootScope.$digest();
expect(log).toEqual([{newVal: ['a', 'c'], oldVal: ['a', 'b']}]);
}));
it('should trigger when property changes into array', function() {
$rootScope.obj = 'test';
$rootScope.$digest();
expect(log.empty()).toEqual([{newVal: "test", oldVal: "test", identical: true}]);
$rootScope.obj = [];
$rootScope.$digest();
expect(log.empty()).toEqual([{newVal: [], oldVal: "test"}]);
$rootScope.obj = {};
$rootScope.$digest();
expect(log.empty()).toEqual([{newVal: {}, oldVal: []}]);
$rootScope.obj = [];
$rootScope.$digest();
expect(log.empty()).toEqual([{newVal: [], oldVal: {}}]);
$rootScope.obj = undefined;
$rootScope.$digest();
expect(log.empty()).toEqual([{newVal: undefined, oldVal: []}]);
});
it('should not trigger change when object in collection changes', function() {
$rootScope.obj = [{}];
$rootScope.$digest();
expect(log.empty()).toEqual([{newVal: [{}], oldVal: [{}], identical: true}]);
$rootScope.obj[0].name = 'foo';
$rootScope.$digest();
expect(log).toEqual([]);
});
it('should watch array properties', function() {
$rootScope.obj = [];
$rootScope.$digest();
expect(log.empty()).toEqual([{newVal: [], oldVal: [], identical: true}]);
$rootScope.obj.push('a');
$rootScope.$digest();
expect(log.empty()).toEqual([{newVal: ['a'], oldVal: []}]);
$rootScope.obj[0] = 'b';
$rootScope.$digest();
expect(log.empty()).toEqual([{newVal: ['b'], oldVal: ['a']}]);
$rootScope.obj.push([]);
$rootScope.obj.push({});
$rootScope.$digest();
expect(log.empty()).toEqual([{newVal: ['b', [], {}], oldVal: ['b']}]);
var temp = $rootScope.obj[1];
$rootScope.obj[1] = $rootScope.obj[2];
$rootScope.obj[2] = temp;
$rootScope.$digest();
expect(log.empty()).toEqual([{newVal: ['b', {}, []], oldVal: ['b', [], {}]}]);
$rootScope.obj.shift();
$rootScope.$digest();
expect(log.empty()).toEqual([{newVal: [{}, []], oldVal: ['b', {}, []]}]);
});
it('should not infinitely digest when current value is NaN', function() {
$rootScope.obj = [NaN];
expect(function() {
$rootScope.$digest();
}).not.toThrow();
});
it('should watch array-like objects like arrays', function() {
var arrayLikelog = [];
$rootScope.$watchCollection('arrayLikeObject', function logger(obj) {
forEach(obj, function(element) {
arrayLikelog.push(element.name);
});
});
document.body.innerHTML = "<p>" +
"<a name='x'>a</a>" +
"<a name='y'>b</a>" +
"</p>";
$rootScope.arrayLikeObject = document.getElementsByTagName('a');
$rootScope.$digest();
expect(arrayLikelog).toEqual(['x', 'y']);
});
});
describe('object', function() {
it('should return oldCollection === newCollection only on the first listener call',
inject(function($rootScope, log) {
$rootScope.obj = {'a': 'b'};
// first time should be identical
$rootScope.$digest();
expect(log.empty()).toEqual([{newVal: {'a': 'b'}, oldVal: {'a': 'b'}, identical: true}]);
// second time not identical
$rootScope.obj.a = 'c';
$rootScope.$digest();
expect(log).toEqual([{newVal: {'a': 'c'}, oldVal: {'a': 'b'}}]);
}));
it('should trigger when property changes into object', function() {
$rootScope.obj = 'test';
$rootScope.$digest();
expect(log.empty()).toEqual([{newVal: 'test', oldVal: 'test', identical: true}]);
$rootScope.obj = {};
$rootScope.$digest();
expect(log.empty()).toEqual([{newVal: {}, oldVal: 'test'}]);
});
it('should not trigger change when object in collection changes', function() {
$rootScope.obj = {name: {}};
$rootScope.$digest();
expect(log.empty()).toEqual([{newVal: {name: {}}, oldVal: {name: {}}, identical: true}]);
$rootScope.obj.name.bar = 'foo';
$rootScope.$digest();
expect(log.empty()).toEqual([]);
});
it('should watch object properties', function() {
$rootScope.obj = {};
$rootScope.$digest();
expect(log.empty()).toEqual([{newVal: {}, oldVal: {}, identical: true}]);
$rootScope.obj.a= 'A';
$rootScope.$digest();
expect(log.empty()).toEqual([{newVal: {a: 'A'}, oldVal: {}}]);
$rootScope.obj.a = 'B';
$rootScope.$digest();
expect(log.empty()).toEqual([{newVal: {a: 'B'}, oldVal: {a: 'A'}}]);
$rootScope.obj.b = [];
$rootScope.obj.c = {};
$rootScope.$digest();
expect(log.empty()).toEqual([{newVal: {a: 'B', b: [], c: {}}, oldVal: {a: 'B'}}]);
var temp = $rootScope.obj.a;
$rootScope.obj.a = $rootScope.obj.b;
$rootScope.obj.c = temp;
$rootScope.$digest();
expect(log.empty()).
toEqual([{newVal: {a: [], b: [], c: 'B'}, oldVal: {a: 'B', b: [], c: {}}}]);
delete $rootScope.obj.a;
$rootScope.$digest();
expect(log.empty()).toEqual([{newVal: {b: [], c: 'B'}, oldVal: {a: [], b: [], c: 'B'}}]);
});
it('should not infinitely digest when current value is NaN', function() {
$rootScope.obj = {a: NaN};
expect(function() {
$rootScope.$digest();
}).not.toThrow();
});
it('should handle objects created using `Object.create(null)`', function() {
$rootScope.obj = Object.create(null);
$rootScope.obj.a = 'a';
$rootScope.obj.b = 'b';
$rootScope.$digest();
expect(log.empty()[0].newVal).toEqual(extend(Object.create(null), {a: 'a', b: 'b'}));
delete $rootScope.obj.b;
$rootScope.$digest();
expect(log.empty()[0].newVal).toEqual(extend(Object.create(null), {a: 'a'}));
});
});
});
describe('optimizations', function() {
function setupWatches(scope, log) {
scope.$watch(function() { log('w1'); return scope.w1; }, log.fn('w1action'));
scope.$watch(function() { log('w2'); return scope.w2; }, log.fn('w2action'));
scope.$watch(function() { log('w3'); return scope.w3; }, log.fn('w3action'));
scope.$digest();
log.reset();
}
it('should check watches only once during an empty digest', inject(function(log, $rootScope) {
setupWatches($rootScope, log);
$rootScope.$digest();
expect(log).toEqual(['w1', 'w2', 'w3']);
}));
it('should quit digest early after we check the last watch that was previously dirty',
inject(function(log, $rootScope) {
setupWatches($rootScope, log);
$rootScope.w1 = 'x';
$rootScope.$digest();
expect(log).toEqual(['w1', 'w1action', 'w2', 'w3', 'w1']);
}));
it('should not quit digest early if a new watch was added from an existing watch action',
inject(function(log, $rootScope) {
setupWatches($rootScope, log);
$rootScope.$watch(log.fn('w4'), function() {
log('w4action');
$rootScope.$watch(log.fn('w5'), log.fn('w5action'));
});
$rootScope.$digest();
expect(log).toEqual(['w1', 'w2', 'w3', 'w4', 'w4action',
'w1', 'w2', 'w3', 'w4', 'w5', 'w5action',
'w1', 'w2', 'w3', 'w4', 'w5']);
}));
it('should not quit digest early if an evalAsync task was scheduled from a watch action',
inject(function(log, $rootScope) {
setupWatches($rootScope, log);
$rootScope.$watch(log.fn('w4'), function() {
log('w4action');
$rootScope.$evalAsync(function() {
log('evalAsync');
});
});
$rootScope.$digest();
expect(log).toEqual(['w1', 'w2', 'w3', 'w4', 'w4action', 'evalAsync',
'w1', 'w2', 'w3', 'w4']);
}));
it('should quit digest early but not too early when various watches fire', inject(function(log, $rootScope) {
setupWatches($rootScope, log);
$rootScope.$watch(function() { log('w4'); return $rootScope.w4; }, function(newVal) {
log('w4action');
$rootScope.w2 = newVal;
});
$rootScope.$digest();
log.reset();
$rootScope.w1 = 'x';
$rootScope.w4 = 'x';
$rootScope.$digest();
expect(log).toEqual(['w1', 'w1action', 'w2', 'w3', 'w4', 'w4action',
'w1', 'w2', 'w2action', 'w3', 'w4',
'w1', 'w2']);
}));
});
});
describe('$watchGroup', function() {
var scope;
var log;
beforeEach(inject(function($rootScope, _log_) {
scope = $rootScope.$new();
log = _log_;
}));
it('should detect a change to any one expression in the group', function() {
scope.$watchGroup(['a', 'b'], function(values, oldValues, s) {
expect(s).toBe(scope);
log(oldValues + ' >>> ' + values);
});
scope.a = 'foo';
scope.b = 'bar';
scope.$digest();
expect(log).toEqual('foo,bar >>> foo,bar');
log.reset();
scope.$digest();
expect(log).toEqual('');
scope.a = 'a';
scope.$digest();
expect(log).toEqual('foo,bar >>> a,bar');
log.reset();
scope.a = 'A';
scope.b = 'B';
scope.$digest();
expect(log).toEqual('a,bar >>> A,B');
});
it('should work for a group with just a single expression', function() {
scope.$watchGroup(['a'], function(values, oldValues, s) {
expect(s).toBe(scope);
log(oldValues + ' >>> ' + values);
});
scope.a = 'foo';
scope.$digest();
expect(log).toEqual('foo >>> foo');
log.reset();
scope.$digest();
expect(log).toEqual('');
scope.a = 'bar';
scope.$digest();
expect(log).toEqual('foo >>> bar');
});
it('should call the listener once when the array of watchExpressions is empty', function() {
scope.$watchGroup([], function(values, oldValues) {
log(oldValues + ' >>> ' + values);
});