angular-cn/modules/angular2/test/di/injector_spec.js

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import {isBlank} from 'angular2/src/facade/lang';
import {describe, ddescribe, it, iit, expect, beforeEach} from 'angular2/test_lib';
import {Injector, Inject, InjectLazy, Optional, bind, ResolvedBinding} from 'angular2/di';
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class Engine {
}
class BrokenEngine {
constructor() {
throw "Broken Engine";
}
}
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class DashboardSoftware {
}
class Dashboard {
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constructor(software: DashboardSoftware) {}
}
class TurboEngine extends Engine {
}
class Car {
engine:Engine;
constructor(engine:Engine) {
this.engine = engine;
}
}
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class CarWithLazyEngine {
engineFactory;
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constructor(@InjectLazy(Engine) engineFactory) {
this.engineFactory = engineFactory;
}
}
class CarWithOptionalEngine {
engine;
constructor(@Optional() engine:Engine) {
this.engine = engine;
}
}
class CarWithDashboard {
engine:Engine;
dashboard:Dashboard;
constructor(engine:Engine, dashboard:Dashboard) {
this.engine = engine;
this.dashboard = dashboard;
}
}
class SportsCar extends Car {
engine:Engine;
constructor(engine:Engine) {
super(engine);
}
}
class CarWithInject {
engine:Engine;
constructor(@Inject(TurboEngine) engine:Engine) {
this.engine = engine;
}
}
class CyclicEngine {
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constructor(car:Car) {}
}
class NoAnnotations {
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constructor(secretDependency) {}
}
export function main() {
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describe('injector', function () {
it('should instantiate a class without dependencies', function () {
var injector = Injector.resolveAndCreate([Engine]);
var engine = injector.get(Engine);
expect(engine).toBeAnInstanceOf(Engine);
});
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it('should resolve dependencies based on type information', function () {
var injector = Injector.resolveAndCreate([Engine, Car]);
var car = injector.get(Car);
expect(car).toBeAnInstanceOf(Car);
expect(car.engine).toBeAnInstanceOf(Engine);
});
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it('should resolve dependencies based on @Inject annotation', function () {
var injector = Injector.resolveAndCreate([TurboEngine, Engine, CarWithInject]);
var car = injector.get(CarWithInject);
expect(car).toBeAnInstanceOf(CarWithInject);
expect(car.engine).toBeAnInstanceOf(TurboEngine);
});
it('should throw when no type and not @Inject', function () {
expect(() => Injector.resolveAndCreate([NoAnnotations])).toThrowError(
'Cannot resolve all parameters for NoAnnotations');
});
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it('should cache instances', function () {
var injector = Injector.resolveAndCreate([Engine]);
var e1 = injector.get(Engine);
var e2 = injector.get(Engine);
expect(e1).toBe(e2);
});
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it('should bind to a value', function () {
var injector = Injector.resolveAndCreate([
bind(Engine).toValue("fake engine")
]);
var engine = injector.get(Engine);
expect(engine).toEqual("fake engine");
});
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it('should bind to a factory', function () {
function sportsCarFactory(e:Engine) {
return new SportsCar(e);
}
var injector = Injector.resolveAndCreate([
Engine,
bind(Car).toFactory(sportsCarFactory)
]);
var car = injector.get(Car);
expect(car).toBeAnInstanceOf(SportsCar);
expect(car.engine).toBeAnInstanceOf(Engine);
});
it('should bind to an alias', function() {
var injector = Injector.resolveAndCreate([
Engine,
bind(SportsCar).toClass(SportsCar),
bind(Car).toAlias(SportsCar)
]);
var car = injector.get(Car);
var sportsCar = injector.get(SportsCar);
expect(car).toBeAnInstanceOf(SportsCar);
expect(car).toBe(sportsCar);
});
it('should throw when the aliased binding does not exist', function () {
var injector = Injector.resolveAndCreate([
bind('car').toAlias(SportsCar)
]);
expect(() => injector.get('car')).toThrowError('No provider for SportsCar! (car -> SportsCar)');
});
it('should support overriding factory dependencies', function () {
var injector = Injector.resolveAndCreate([
Engine,
bind(Car).toFactory((e) => new SportsCar(e), [Engine])
]);
var car = injector.get(Car);
expect(car).toBeAnInstanceOf(SportsCar);
expect(car.engine).toBeAnInstanceOf(Engine);
});
it('should support optional dependencies', function () {
var injector = Injector.resolveAndCreate([
CarWithOptionalEngine
]);
var car = injector.get(CarWithOptionalEngine);
expect(car.engine).toEqual(null);
});
it("should flatten passed-in bindings", function () {
var injector = Injector.resolveAndCreate([
[[Engine, Car]]
]);
var car = injector.get(Car);
expect(car).toBeAnInstanceOf(Car);
});
it("should use the last binding "+
"when there are mutliple bindings for same token", function () {
var injector = Injector.resolveAndCreate([
bind(Engine).toClass(Engine),
bind(Engine).toClass(TurboEngine)
]);
expect(injector.get(Engine)).toBeAnInstanceOf(TurboEngine);
});
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it('should use non-type tokens', function () {
var injector = Injector.resolveAndCreate([
bind('token').toValue('value')
]);
expect(injector.get('token')).toEqual('value');
});
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it('should throw when given invalid bindings', function () {
expect(() => Injector.resolveAndCreate(["blah"])).toThrowError('Invalid binding blah');
expect(() => Injector.resolveAndCreate([bind("blah")])).toThrowError('Invalid binding blah');
});
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it('should provide itself', function () {
var parent = Injector.resolveAndCreate([]);
var child = parent.resolveAndCreateChild([]);
expect(child.get(Injector)).toBe(child);
});
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it('should throw when no provider defined', function () {
var injector = Injector.resolveAndCreate([]);
expect(() => injector.get('NonExisting')).toThrowError('No provider for NonExisting!');
});
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it('should show the full path when no provider', function () {
var injector = Injector.resolveAndCreate([CarWithDashboard, Engine, Dashboard]);
expect(() => injector.get(CarWithDashboard)).
toThrowError('No provider for DashboardSoftware! (CarWithDashboard -> Dashboard -> DashboardSoftware)');
});
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it('should throw when trying to instantiate a cyclic dependency', function () {
var injector = Injector.resolveAndCreate([
Car,
bind(Engine).toClass(CyclicEngine)
]);
expect(() => injector.get(Car))
.toThrowError('Cannot instantiate cyclic dependency! (Car -> Engine -> Car)');
expect(() => injector.asyncGet(Car))
.toThrowError('Cannot instantiate cyclic dependency! (Car -> Engine -> Car)');
});
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it('should show the full path when error happens in a constructor', function () {
var injector = Injector.resolveAndCreate([
Car,
bind(Engine).toClass(BrokenEngine)
]);
try {
injector.get(Car);
throw "Must throw";
} catch (e) {
expect(e.message).toContain("Error during instantiation of Engine! (Car -> Engine)");
}
});
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it('should instantiate an object after a failed attempt', function () {
var isBroken = true;
var injector = Injector.resolveAndCreate([
Car,
bind(Engine).toFactory(() => isBroken ? new BrokenEngine() : new Engine())
]);
expect(() => injector.get(Car)).toThrowError(new RegExp("Error"));
isBroken = false;
expect(injector.get(Car)).toBeAnInstanceOf(Car);
});
it('should support null values', () => {
var injector = Injector.resolveAndCreate([bind('null').toValue(null)]);
expect(injector.get('null')).toBe(null);
});
describe("default bindings", function () {
it("should be used when no matching binding found", function () {
var injector = Injector.resolveAndCreate([], {defaultBindings: true});
var car = injector.get(Car);
expect(car).toBeAnInstanceOf(Car);
});
it("should use the matching binding when it is available", function () {
var injector = Injector.resolveAndCreate([
bind(Car).toClass(SportsCar)
], {defaultBindings: true});
var car = injector.get(Car);
expect(car).toBeAnInstanceOf(SportsCar);
});
});
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describe("child", function () {
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it('should load instances from parent injector', function () {
var parent = Injector.resolveAndCreate([Engine]);
var child = parent.resolveAndCreateChild([]);
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var engineFromParent = parent.get(Engine);
var engineFromChild = child.get(Engine);
expect(engineFromChild).toBe(engineFromParent);
});
it("should not use the child bindings when resolving the dependencies of a parent binding", function () {
var parent = Injector.resolveAndCreate([
Car, Engine
]);
var child = parent.resolveAndCreateChild([
bind(Engine).toClass(TurboEngine)
]);
var carFromChild = child.get(Car);
expect(carFromChild.engine).toBeAnInstanceOf(Engine);
});
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it('should create new instance in a child injector', function () {
var parent = Injector.resolveAndCreate([Engine]);
var child = parent.resolveAndCreateChild([
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bind(Engine).toClass(TurboEngine)
]);
var engineFromParent = parent.get(Engine);
var engineFromChild = child.get(Engine);
expect(engineFromParent).not.toBe(engineFromChild);
expect(engineFromChild).toBeAnInstanceOf(TurboEngine);
});
it("should create child injectors without default bindings", function () {
var parent = Injector.resolveAndCreate([], {defaultBindings: true});
var child = parent.resolveAndCreateChild([]);
//child delegates to parent the creation of Car
var childCar = child.get(Car);
var parentCar = parent.get(Car);
expect(childCar).toBe(parentCar);
});
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});
describe("lazy", function () {
it("should create dependencies lazily", function () {
var injector = Injector.resolveAndCreate([
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Engine,
CarWithLazyEngine
]);
var car = injector.get(CarWithLazyEngine);
expect(car.engineFactory()).toBeAnInstanceOf(Engine);
});
it("should cache instance created lazily", function () {
var injector = Injector.resolveAndCreate([
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Engine,
CarWithLazyEngine
]);
var car = injector.get(CarWithLazyEngine);
var e1 = car.engineFactory();
var e2 = car.engineFactory();
expect(e1).toBe(e2);
});
});
describe('resolve', function() {
it('should resolve and flatten', function() {
var bindings = Injector.resolve([Engine, [BrokenEngine]]);
bindings.forEach(function(b) {
if (isBlank(b)) return; // the result is a sparse array
expect(b instanceof ResolvedBinding).toBe(true);
});
});
});
});
}