Full PromisifiedStorage + Simplifications

src/core/client/embed/testUtils/InMemoryStorage.spec.ts

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+import createInMemoryStorage from "./InMemoryStorage";
+
+it("should set and unset values", () => {
+  const storage = createInMemoryStorage();
+  storage.setItem("test", "value");
+  expect(storage.getItem("test")).toBe("value");
+  storage.removeItem("test");
+  expect(storage.getItem("test")).toBeNull();
+});
+
+it("should return length", () => {
+  const storage = createInMemoryStorage();
+  storage.setItem("a", "value");
+  storage.setItem("b", "value");
+  storage.setItem("c", "value");
+  expect(storage.length).toBe(3);
+});
+
+it("should nth key", () => {
+  const storage = createInMemoryStorage();
+  storage.setItem("a", "0");
+  storage.setItem("b", "1");
+  storage.setItem("c", "2");
+  expect(storage.key(2)).toBe("c");
+});
+
+it("accepts predefined data", () => {
+  const storage = createInMemoryStorage({
+    a: "0",
+    b: "1",
+    c: "2",
+  });
+  expect(storage.toString()).toMatchSnapshot();
+});

src/core/client/embed/testUtils/InMemoryStorage.ts

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+/**
+ * InMemoryStorage is a dumb implementation of the Storage interface that will
+ * not persist the data at all. It implements the Storage interface found:
+ *
+ * https://developer.mozilla.org/en-US/docs/Web/API/Storage
+ */
+class InMemoryStorage implements Storage {
+  private data: Record<string, string>;
+
+  constructor(data: Record<string, string> = {}) {
+    this.data = data;
+  }
+
+  get length() {
+    return Object.keys(this.data).length;
+  }
+
+  public clear() {
+    this.data = {};
+  }
+
+  public key(n: number) {
+    if (this.length <= n) {
+      return null;
+    }
+
+    return Object.keys(this.data)[n];
+  }
+
+  public getItem(key: string) {
+    return this.data[key] || null;
+  }
+
+  public setItem(key: string, value: string) {
+    this.data[key] = value;
+  }
+
+  public removeItem(key: string) {
+    delete this.data[key];
+  }
+
+  public toString() {
+    return JSON.stringify(this.data);
+  }
+}
+
+export default function createInMemoryStorage(data?: Record<string, string>) {
+  return new InMemoryStorage(data);
+}

src/core/client/embed/testUtils/__snapshots__/InMemoryStorage.spec.ts.snap

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+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`accepts predefined data 1`] = `"{\\"a\\":\\"0\\",\\"b\\":\\"1\\",\\"c\\":\\"2\\"}"`;

src/core/client/embed/testUtils/index.ts

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+export { default as createInMemoryStorage } from "./InMemoryStorage";