fix: simulated HTTP errors now delayed as expected (#182)

closes #180

also fixes type error (#180)

CHANGELOG.md

@@ -8,7 +8,20 @@ because this is a development tool, not a production product.
 We do try to tell you about such changes in this `CHANGELOG.md`
 and we fix bugs as fast as we can.
 
-<a id="0.5.2"></a>
+<a id="0.5.4"></a>
+## 0.5.4 (2018-03-09)
+
+Simulated HTTP error responses were not delaying the prescribed time when using RxJS `delay()`
+because it was short-circuited by the ErrorResponse.
+New `delayResponse` function does it right.
+Should not break you unless you incorrectly expected no delay for errors.
+
+Also, this library no longer calls RxJS `delay()` which may make testing with it easier
+(Angular TestBed does not handle RxJS `delay()` well because that operator uses `interval()`).
+
+Also fixes type error (issue #180).
+
+<a id="0.5.3"></a>
 ## 0.5.3 (2018-01-06)
 Can make use of `HttpParams` which yields a `request.urlWithParams`.
 Added supporting `HeroService.searchHeroes(term: string)` and test.

delay-response.d.ts

@@ -0,0 +1,3 @@
+import { Observable } from 'rxjs/Observable';
+/** adds specified delay (in ms) to both next and error channels of the response observable */
+export declare function delayResponse<T>(response$: Observable<T>, delayMs: number): Observable<T>;

delay-response.metadata.json

@@ -0,0 +1 @@
+[{"__symbolic":"module","version":3,"metadata":{"delayResponse":{"__symbolic":"function","parameters":["response$","delayMs"],"value":{"__symbolic":"error","message":"Function call not supported","line":5,"character":27}}}},{"__symbolic":"module","version":1,"metadata":{"delayResponse":{"__symbolic":"function","parameters":["response$","delayMs"],"value":{"__symbolic":"error","message":"Function call not supported","line":5,"character":27}}}}]

http-client-backend.service.d.ts

@@ -1,4 +1,4 @@
-import { HttpBackend, HttpHeaders, HttpRequest, HttpResponse, HttpXhrBackend, XhrFactory } from '@angular/common/http';
+import { HttpBackend, HttpEvent, HttpHeaders, HttpRequest, HttpResponse, HttpXhrBackend, XhrFactory } from '@angular/common/http';
 import { Observable } from 'rxjs/Observable';
 import { InMemoryBackendConfigArgs, InMemoryDbService, ResponseOptions } from './interfaces';
 import { BackendService } from './backend.service';
@@ -32,7 +32,7 @@ import { BackendService } from './backend.service';
 export declare class HttpClientBackendService extends BackendService implements HttpBackend {
     private xhrFactory;
     constructor(inMemDbService: InMemoryDbService, config: InMemoryBackendConfigArgs, xhrFactory: XhrFactory);
-    handle(req: HttpRequest<any>): Observable<HttpResponse<any>>;
+    handle(req: HttpRequest<any>): Observable<HttpEvent<any>>;
     protected getJsonBody(req: HttpRequest<any>): any;
     protected getRequestMethod(req: HttpRequest<any>): string;
     protected createHeaders(headers: {