[Feature] Testing Module

src/ngx-jsonapi-testing.module.ts

@@ -0,0 +1,38 @@
+import { NgModule, ModuleWithProviders, Optional, SkipSelf } from '@angular/core';
+import { HttpClientTestingModule } from '@angular/common/http/testing';
+
+import { Core as JsonapiCore } from './core';
+import { Http as JsonapiHttp } from './sources/http.service';
+import { StoreService as JsonapiStore } from './sources/store.service';
+
+// testing
+import { JsonapiConfig } from './jsonapi-config';
+
+@NgModule({
+    exports: [
+        HttpClientTestingModule
+    ],
+    providers: [
+        JsonapiCore,
+        JsonapiStore,
+        JsonapiConfig, // Need this here for testing
+        JsonapiHttp
+    ]
+})
+export class NgxJsonapiTestingModule {
+    public constructor(
+        @Optional()
+        @SkipSelf()
+        parentModule: NgxJsonapiTestingModule    ) {
+        if (parentModule) {
+            throw new Error('NgxJsonapiTestingModule is already loaded. Import it in the AppModule only');
+        }
+    }
+
+    public static forRoot(config: JsonapiConfig): ModuleWithProviders {
+        return {
+            ngModule: NgxJsonapiTestingModule,
+            providers: [{ provide: JsonapiConfig, useValue: config }]
+        };
+    }
+}