Hi,
I am not good at unit testing but willing to learn. The following is my
service. Basically, there are 3 JSON files a,b,c. It should return a if it
exists, else b. if b is not found then c, which is always avaliable (or is
default).
import { Injectable } from "@angular/core";
import { HttpClient } from "@angular/common/http";
import { Observable } from "rxjs/Rx";
@Injectable()
export class DataService {
constructor(
public http: HttpClient
) {}
public getDataJSON(): Observable<any> {
/*
returns JSON file. Return contents of a.json if it exists
else b.json. if b.json is not found, return c.json
*/
let vm = this;
return new Observable(observer => {
vm.http
.get(
"/assets/a.json"
)
.subscribe(
data => {
console.log("a.json found");
observer.next(data);
observer.complete();
},
error => {
// is it missing error?
console.log(
"error or missing a.json ",
error
);
if (error.status == 404) {
// see if b.json exists
vm.http
.get(
"/assets/b.json"
)
.subscribe(
data => {
console.log("use b.json");
observer.next(data);
observer.complete();
},
error => {
console.log(
"error with b.json or missing ",
error
);
vm.http
.get(
"/assets/c.json"
)
.subscribe(
data => {
console.log("using default c.json ", data);
observer.next(data);
observer.complete();
},
error => {
console.log("we cant find any data");
observer.next(null);
observer.complete();
}
);
}
);
}
}
);
});
}
}
I want to make sure that the correct json file is picked but really lost on
how to do a test for this kind of thing.
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