404 lines
14 KiB
TypeScript
404 lines
14 KiB
TypeScript
import {isBlank, BaseException, stringify} from 'angular2/src/facade/lang';
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import {describe, ddescribe, it, iit, expect, beforeEach} from 'angular2/test_lib';
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import {
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Injector,
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bind,
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ResolvedBinding,
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Key,
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forwardRef,
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DependencyAnnotation,
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Injectable
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} from 'angular2/di';
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import {Optional, Inject, InjectLazy} from 'angular2/src/di/decorators';
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import * as ann from 'angular2/src/di/annotations_impl';
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class CustomDependencyAnnotation extends DependencyAnnotation {}
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class Engine {}
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class BrokenEngine {
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constructor() { throw new BaseException("Broken Engine"); }
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}
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class DashboardSoftware {}
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@Injectable()
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class Dashboard {
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constructor(software: DashboardSoftware) {}
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}
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class TurboEngine extends Engine {}
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@Injectable()
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class Car {
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engine: Engine;
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constructor(engine: Engine) { this.engine = engine; }
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}
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@Injectable()
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class CarWithLazyEngine {
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engineFactory;
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constructor(@InjectLazy(Engine) engineFactory) { this.engineFactory = engineFactory; }
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}
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@Injectable()
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class CarWithOptionalEngine {
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engine;
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constructor(@Optional() engine: Engine) { this.engine = engine; }
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}
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@Injectable()
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class CarWithDashboard {
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engine: Engine;
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dashboard: Dashboard;
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constructor(engine: Engine, dashboard: Dashboard) {
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this.engine = engine;
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this.dashboard = dashboard;
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}
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}
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@Injectable()
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class SportsCar extends Car {
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engine: Engine;
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constructor(engine: Engine) { super(engine); }
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}
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@Injectable()
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class CarWithInject {
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engine: Engine;
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constructor(@Inject(TurboEngine) engine: Engine) { this.engine = engine; }
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}
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@Injectable()
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class CyclicEngine {
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constructor(car: Car) {}
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}
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class NoAnnotations {
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constructor(secretDependency) {}
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}
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export function main() {
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describe('injector', function() {
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it('should instantiate a class without dependencies', function() {
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var injector = Injector.resolveAndCreate([Engine]);
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var engine = injector.get(Engine);
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expect(engine).toBeAnInstanceOf(Engine);
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});
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it('should resolve dependencies based on type information', function() {
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var injector = Injector.resolveAndCreate([Engine, Car]);
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var car = injector.get(Car);
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expect(car).toBeAnInstanceOf(Car);
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expect(car.engine).toBeAnInstanceOf(Engine);
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});
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it('should resolve dependencies based on @Inject annotation', function() {
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var injector = Injector.resolveAndCreate([TurboEngine, Engine, CarWithInject]);
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var car = injector.get(CarWithInject);
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expect(car).toBeAnInstanceOf(CarWithInject);
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expect(car.engine).toBeAnInstanceOf(TurboEngine);
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});
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it('should throw when no type and not @Inject', function() {
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expect(() => Injector.resolveAndCreate([NoAnnotations]))
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.toThrowError('Cannot resolve all parameters for NoAnnotations. ' +
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'Make sure they all have valid type or annotations.');
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});
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it('should cache instances', function() {
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var injector = Injector.resolveAndCreate([Engine]);
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var e1 = injector.get(Engine);
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var e2 = injector.get(Engine);
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expect(e1).toBe(e2);
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});
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it('should bind to a value', function() {
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var injector = Injector.resolveAndCreate([bind(Engine).toValue("fake engine")]);
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var engine = injector.get(Engine);
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expect(engine).toEqual("fake engine");
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});
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it('should bind to a factory', function() {
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function sportsCarFactory(e) { return new SportsCar(e); }
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var injector =
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Injector.resolveAndCreate([Engine, bind(Car).toFactory(sportsCarFactory, [Engine])]);
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var car = injector.get(Car);
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expect(car).toBeAnInstanceOf(SportsCar);
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expect(car.engine).toBeAnInstanceOf(Engine);
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});
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it('should bind to an alias', function() {
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var injector = Injector.resolveAndCreate(
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[Engine, bind(SportsCar).toClass(SportsCar), bind(Car).toAlias(SportsCar)]);
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var car = injector.get(Car);
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var sportsCar = injector.get(SportsCar);
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expect(car).toBeAnInstanceOf(SportsCar);
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expect(car).toBe(sportsCar);
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});
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it('should throw when the aliased binding does not exist', function() {
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var injector = Injector.resolveAndCreate([bind('car').toAlias(SportsCar)]);
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var e = `No provider for ${stringify(SportsCar)}! (car -> ${stringify(SportsCar)})`;
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expect(() => injector.get('car')).toThrowError(e);
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});
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it('should handle forwardRef in toAlias', function() {
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var injector = Injector.resolveAndCreate([
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bind('originalEngine')
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.toClass(forwardRef(() => Engine)),
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bind('aliasedEngine').toAlias(forwardRef(() => 'originalEngine'))
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]);
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expect(injector.get('aliasedEngine')).toBeAnInstanceOf(Engine);
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});
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it('should support overriding factory dependencies', function() {
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var injector =
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Injector
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.resolveAndCreate([Engine, bind(Car).toFactory((e) => new SportsCar(e), [Engine])]);
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var car = injector.get(Car);
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expect(car).toBeAnInstanceOf(SportsCar);
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expect(car.engine).toBeAnInstanceOf(Engine);
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});
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it('should support optional dependencies', function() {
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var injector = Injector.resolveAndCreate([CarWithOptionalEngine]);
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var car = injector.get(CarWithOptionalEngine);
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expect(car.engine).toEqual(null);
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});
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it("should flatten passed-in bindings", function() {
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var injector = Injector.resolveAndCreate([[[Engine, Car]]]);
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var car = injector.get(Car);
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expect(car).toBeAnInstanceOf(Car);
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});
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it("should use the last binding " + "when there are multiple bindings for same token",
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function() {
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var injector = Injector.resolveAndCreate(
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[bind(Engine).toClass(Engine), bind(Engine).toClass(TurboEngine)]);
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expect(injector.get(Engine)).toBeAnInstanceOf(TurboEngine);
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});
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it('should use non-type tokens', function() {
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var injector = Injector.resolveAndCreate([bind('token').toValue('value')]);
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expect(injector.get('token')).toEqual('value');
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});
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it('should throw when given invalid bindings', function() {
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expect(() => Injector.resolveAndCreate(<any>["blah"]))
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.toThrowError(
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'Invalid binding - only instances of Binding and Type are allowed, got: blah');
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expect(() => Injector.resolveAndCreate(<any>[bind("blah")]))
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.toThrowError('Invalid binding - only instances of Binding and Type are allowed, ' +
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'got: blah');
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});
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it('should provide itself', function() {
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var parent = Injector.resolveAndCreate([]);
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var child = parent.resolveAndCreateChild([]);
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expect(child.get(Injector)).toBe(child);
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});
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it('should throw when no provider defined', function() {
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var injector = Injector.resolveAndCreate([]);
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expect(() => injector.get('NonExisting')).toThrowError('No provider for NonExisting!');
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});
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it('should show the full path when no provider', function() {
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var injector = Injector.resolveAndCreate([CarWithDashboard, Engine, Dashboard]);
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expect(() => injector.get(CarWithDashboard))
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.toThrowError(
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`No provider for DashboardSoftware! (${stringify(CarWithDashboard)} -> ${stringify(Dashboard)} -> DashboardSoftware)`);
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});
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it('should throw when trying to instantiate a cyclic dependency', function() {
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var injector = Injector.resolveAndCreate([Car, bind(Engine).toClass(CyclicEngine)]);
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expect(() => injector.get(Car))
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.toThrowError(
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`Cannot instantiate cyclic dependency! (${stringify(Car)} -> ${stringify(Engine)} -> ${stringify(Car)})`);
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expect(() => injector.asyncGet(Car))
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.toThrowError(
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`Cannot instantiate cyclic dependency! (${stringify(Car)} -> ${stringify(Engine)} -> ${stringify(Car)})`);
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});
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it('should show the full path when error happens in a constructor', function() {
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var injector = Injector.resolveAndCreate([Car, bind(Engine).toClass(BrokenEngine)]);
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try {
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injector.get(Car);
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throw "Must throw";
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} catch (e) {
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expect(e.message)
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.toContain(`Error during instantiation of Engine! (${stringify(Car)} -> Engine)`);
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expect(e.cause instanceof BaseException).toBeTruthy();
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expect(e.causeKey.token).toEqual(Engine);
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}
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});
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it('should instantiate an object after a failed attempt', function() {
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var isBroken = true;
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var injector = Injector.resolveAndCreate(
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[Car, bind(Engine).toFactory(() => isBroken ? new BrokenEngine() : new Engine())]);
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expect(() => injector.get(Car)).toThrowError(new RegExp("Error"));
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isBroken = false;
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expect(injector.get(Car)).toBeAnInstanceOf(Car);
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});
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it('should support null values', () => {
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var injector = Injector.resolveAndCreate([bind('null').toValue(null)]);
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expect(injector.get('null')).toBe(null);
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});
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describe("default bindings", function() {
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it("should be used when no matching binding found", function() {
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var injector = Injector.resolveAndCreate([], { defaultBindings: true });
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var car = injector.get(Car);
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expect(car).toBeAnInstanceOf(Car);
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});
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it("should use the matching binding when it is available", function() {
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var injector =
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Injector.resolveAndCreate([bind(Car).toClass(SportsCar)], {defaultBindings: true});
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var car = injector.get(Car);
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expect(car).toBeAnInstanceOf(SportsCar);
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});
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});
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describe("child", function() {
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it('should load instances from parent injector', function() {
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var parent = Injector.resolveAndCreate([Engine]);
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var child = parent.resolveAndCreateChild([]);
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var engineFromParent = parent.get(Engine);
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var engineFromChild = child.get(Engine);
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expect(engineFromChild).toBe(engineFromParent);
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});
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it("should not use the child bindings when resolving the dependencies of a parent binding",
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function() {
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var parent = Injector.resolveAndCreate([Car, Engine]);
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var child = parent.resolveAndCreateChild([bind(Engine).toClass(TurboEngine)]);
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var carFromChild = child.get(Car);
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expect(carFromChild.engine).toBeAnInstanceOf(Engine);
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});
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it('should create new instance in a child injector', function() {
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var parent = Injector.resolveAndCreate([Engine]);
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var child = parent.resolveAndCreateChild([bind(Engine).toClass(TurboEngine)]);
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var engineFromParent = parent.get(Engine);
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var engineFromChild = child.get(Engine);
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expect(engineFromParent).not.toBe(engineFromChild);
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expect(engineFromChild).toBeAnInstanceOf(TurboEngine);
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});
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it("should create child injectors without default bindings", function() {
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var parent = Injector.resolveAndCreate([], { defaultBindings: true });
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var child = parent.resolveAndCreateChild([]);
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// child delegates to parent the creation of Car
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var childCar = child.get(Car);
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var parentCar = parent.get(Car);
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expect(childCar).toBe(parentCar);
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});
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it("should give access to direct parent", () => {
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var parent = Injector.resolveAndCreate([]);
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var child = parent.resolveAndCreateChild([]);
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expect(child.parent).toBe(parent);
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});
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});
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describe("lazy", function() {
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it("should create dependencies lazily", function() {
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var injector = Injector.resolveAndCreate([Engine, CarWithLazyEngine]);
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var car = injector.get(CarWithLazyEngine);
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expect(car.engineFactory()).toBeAnInstanceOf(Engine);
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});
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it("should cache instance created lazily", function() {
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var injector = Injector.resolveAndCreate([Engine, CarWithLazyEngine]);
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var car = injector.get(CarWithLazyEngine);
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var e1 = car.engineFactory();
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var e2 = car.engineFactory();
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expect(e1).toBe(e2);
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});
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});
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describe('resolve', function() {
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it('should resolve and flatten', () => {
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var bindings = Injector.resolve([Engine, [BrokenEngine]]);
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bindings.forEach(function(b) {
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if (isBlank(b)) return; // the result is a sparse array
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expect(b instanceof ResolvedBinding).toBe(true);
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});
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});
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it('should resolve forward references', () => {
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var bindings = Injector.resolve([
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forwardRef(() => Engine),
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[bind(forwardRef(() => BrokenEngine)).toClass(forwardRef(() => Engine))],
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bind(forwardRef(() => String)).toFactory(() => 'OK', [forwardRef(() => Engine)]),
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bind(forwardRef(() => DashboardSoftware))
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.toAsyncFactory(() => 123, [forwardRef(() => BrokenEngine)])
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]);
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var engineBinding = bindings[Key.get(Engine).id];
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var brokenEngineBinding = bindings[Key.get(BrokenEngine).id];
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var stringBinding = bindings[Key.get(String).id];
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var dashboardSoftwareBinding = bindings[Key.get(DashboardSoftware).id];
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expect(engineBinding.factory() instanceof Engine).toBe(true);
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expect(brokenEngineBinding.factory() instanceof Engine).toBe(true);
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expect(stringBinding.dependencies[0].key).toEqual(Key.get(Engine));
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expect(dashboardSoftwareBinding.dependencies[0].key).toEqual(Key.get(BrokenEngine));
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});
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it('should support overriding factory dependencies with dependency annotations', function() {
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var bindings = Injector.resolve(
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[bind("token")
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.toFactory((e) => "result",
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[[new ann.Inject("dep"), new CustomDependencyAnnotation()]])]);
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var binding = bindings[Key.get("token").id];
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expect(binding.dependencies[0].key.token).toEqual("dep");
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expect(binding.dependencies[0].properties).toEqual([new CustomDependencyAnnotation()]);
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});
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});
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});
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}
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