Examples of using Angular 2 TestBed

Angular 2 Testing service examples using TestBed

import { inject, TestBed } from "@angular/core/testing";
import { SessionService } from "./session.service";

describe("SessionService", () => {

    let sessionService: SessionService;

    beforeEach(() => {
        TestBed.configureTestingModule({
            providers: [SessionService]
        });
    });

    beforeEach(inject([SessionService], (ss: SessionService) => { sessionService = ss; }));


    describe("When getting and setting", () => {

        let paths: any;

        beforeAll(() => {
            paths = {
                    path1: "/SOME_PATH",
                    path2: "/SOME_OTHER_PATH",
                    path3: "/THE_PATH_OF_LEAST_RESISTENCE"
                };
        });

        describe("Paths", () => {
            it("should set paths and return an observable", () => {
                let dataStore: {};

                sessionService.setPaths(paths);

                sessionService
                    .getPaths()
                    .subscribe((data: any) => {
                        dataStore = data;
                    });

                expect(dataStore).toEqual(paths);
            });

            describe("a path", () => {

                it("should return a path", () => {
                    let path: {};

                    sessionService.setPaths(paths);

                    sessionService.getPath("path1")
                        .subscribe((data: any) => {
                            path = data;
                        });

                    expect(path).toBe("/SOME_PATH");
                });
            });
        });

        describe("Product ID", () => {
            it("should return an Obs value true when seting a valid product Id", () => {
                let setResult: boolean;

                sessionService
                    .setProductId(1007)
                    .subscribe((data: boolean) => {
                        setResult = data;
                    });

                expect(setResult).toBe(true);
            });

            it("should return an Obs value false when seting a invalid product Id", () => {
                let setResult: boolean;

                sessionService
                    .setProductId(undefined)
                    .subscribe((data: boolean) => {
                        setResult = data;
                    });

                expect(setResult).toBe(false);
            });
        });
    });

    describe("Checking the current path status", () => {

        it("should return true when there is a current path", () => {
            let hasPath: boolean;
            let paths = {
                current: "SOME_PATH"
            };

            sessionService
                .setPaths(paths);

            sessionService.hasCurrentPath().subscribe((data: boolean) => {
                hasPath = data;
            });

            expect(hasPath).toBe(true);
        });

        it("should return false when there is no current path", () => {
            let hasPath: boolean;
            let paths = {};

            sessionService
                .setPaths(paths);

            sessionService.hasCurrentPath().subscribe((data: boolean) => {
                hasPath = data;
            });

            expect(hasPath).toBe(false);
        });
    });
});