Make it possible to not stop something that was never started

Co-authored-by: Mikko Aspiala <mikko.aspiala@gmail.com>

Signed-off-by: Janne Savolainen <janne.savolainen@live.fi>

src/common/utils/get-startable-stoppable.test.ts

@@ -7,7 +7,7 @@ import { getStartableStoppable } from "./get-startable-stoppable";
 describe("getStartableStoppable", () => {
   let stopMock: jest.Mock<() => void>;
   let startMock: jest.Mock<() => () => void>;
-  let actual: { stop: () => void; start: () => void };
+  let actual: { stop: () => void; start: () => void; started: boolean };
 
   beforeEach(() => {
     stopMock = jest.fn();
@@ -30,6 +30,10 @@ describe("getStartableStoppable", () => {
     }).toThrow("Tried to stop \"some-id\", but it has not started yet.");
   });
 
+  it("is not started", () => {
+    expect(actual.started).toBe(false);
+  });
+
   describe("when started", () => {
     beforeEach(() => {
       actual.start();
@@ -39,6 +43,10 @@ describe("getStartableStoppable", () => {
       expect(startMock).toHaveBeenCalled();
     });
 
+    it("is started", () => {
+      expect(actual.started).toBe(true);
+    });
+
     it("when started again, throws", () => {
       expect(() => {
         actual.start();
@@ -58,6 +66,10 @@ describe("getStartableStoppable", () => {
         expect(stopMock).toHaveBeenCalled();
       });
 
+      it("is not started", () => {
+        expect(actual.started).toBe(false);
+      });
+
       it("when stopped again, throws", () => {
         expect(() => {
           actual.stop();
@@ -75,6 +87,10 @@ describe("getStartableStoppable", () => {
           expect(startMock).toHaveBeenCalled();
         });
 
+        it("is started", () => {
+          expect(actual.started).toBe(true);
+        });
+
         it("when stopped, stops", () => {
           stopMock.mockClear();
 

src/common/utils/get-startable-stoppable.ts

@@ -11,6 +11,10 @@ export const getStartableStoppable = (
   let started = false;
 
   return {
+    get started() {
+      return started;
+    },
+
     start: () => {
       if (started) {
         throw new Error(`Tried to start "${id}", but it has already started.`);