Add techincal tests

Signed-off-by: Sebastian Malton <sebastian@malton.name>

src/common/initializable-state/create.test.ts

@@ -0,0 +1,77 @@
+/**
+ * Copyright (c) OpenLens Authors. All rights reserved.
+ * Licensed under MIT License. See LICENSE in root directory for more information.
+ */
+
+import type { AsyncFnMock } from "@async-fn/jest";
+import asyncFn from "@async-fn/jest";
+import type { DiContainer, Injectable } from "@ogre-tools/injectable";
+import { runInAction } from "mobx";
+import { getDiForUnitTesting } from "../../main/getDiForUnitTesting";
+import type { InitializableState } from "./create";
+import { createInitializableState } from "./create";
+
+describe("InitializableState tests", () => {
+  let di: DiContainer;
+
+  beforeEach(() => {
+    di = getDiForUnitTesting({ doGeneralOverrides: true });
+  });
+
+  describe("when created", () => {
+    let stateInjectable: Injectable<InitializableState<number>, unknown, void>;
+    let initMock: AsyncFnMock<() => number>;
+
+    beforeEach(() => {
+      initMock = asyncFn();
+      stateInjectable = createInitializableState({
+        id: "my-state",
+        init: initMock,
+      });
+
+      runInAction(() => {
+        di.register(stateInjectable);
+      });
+    });
+
+    describe("when injected", () => {
+      let state: InitializableState<number>;
+
+      beforeEach(() => {
+        state = di.inject(stateInjectable);
+      });
+
+      it("when get is called, throw", () => {
+        expect(() => state.get()).toThrowError("InitializableState(my-state) has not been initialized yet");
+      });
+
+      describe("when init is called", () => {
+        beforeEach(() => {
+          state.init();
+        });
+
+        it("should call provided initialization function", () => {
+          expect(initMock).toBeCalled();
+        });
+
+        it("when get is called, throw", () => {
+          expect(() => state.get()).toThrowError("InitializableState(my-state) has not finished initializing");
+        });
+
+        describe("when initialization resolves", () => {
+          beforeEach(async () => {
+            await initMock.resolve(42);
+          });
+
+          it("when get is called, returns value", () => {
+            expect(state.get()).toBe(42);
+          });
+
+          it("when init is called again, throws", async () => {
+            await expect(() => state.init()).rejects.toThrow("Cannot initialize InitializableState(my-state) more than once");
+          });
+        });
+      });
+    });
+  });
+});

src/common/initializable-state/create.ts

@@ -17,7 +17,9 @@ export interface InitializableState<T> {
   init: () => Promise<void>;
 }
 
-type InitializableStateValue<T> = { set: false } | { set: true; value: T };
+type InitializableStateValue<T> =
+  | { set: false }
+  | { set: true; value: T } ;
 
 export function createInitializableState<T>(args: CreateInitializableStateArgs<T>): Injectable<InitializableState<T>, unknown, void> {
   const { id, init, injectionToken } = args;
@@ -33,7 +35,7 @@ export function createInitializableState<T>(args: CreateInitializableStateArgs<T
       return {
         init: async () => {
           if (initCalled) {
-            throw new Error(`Cannot initialized AsyncSyncBox ${id}) more than once`);
+            throw new Error(`Cannot initialize InitializableState(${id}) more than once`);
           }
 
           initCalled = true;
@@ -44,11 +46,11 @@ export function createInitializableState<T>(args: CreateInitializableStateArgs<T
         },
         get: () => {
           if (!initCalled) {
-            throw new Error(`AsyncSyncBox(${id}) has not been initialized yet`);
+            throw new Error(`InitializableState(${id}) has not been initialized yet`);
           }
 
-          if (!box.set) {
-            throw new Error(`AsyncSyncBox(${id}) has not finished initializing`);
+          if (box.set === false) {
+            throw new Error(`InitializableState(${id}) has not finished initializing`);
           }
 
           return box.value;