MostRecentActivity changes (#463)

This changes the public API a bit, so that recording activity (the most common use) is less involved.

src/Explorer/MostRecentActivity/MostRecentActivity.test.ts

@@ -0,0 +1,86 @@
+import { observable } from "knockout";
+import { mostRecentActivity } from "./MostRecentActivity";
+
+describe("MostRecentActivity", () => {
+  const accountId = "some account";
+
+  beforeEach(() => mostRecentActivity.clear(accountId));
+
+  it("Has no items at first", () => {
+    expect(mostRecentActivity.getItems(accountId)).toStrictEqual([]);
+  });
+
+  it("Can record collections being opened", () => {
+    const collectionId = "some collection";
+    const databaseId = "some database";
+    const collection = {
+      id: observable(collectionId),
+      databaseId,
+    };
+
+    mostRecentActivity.collectionWasOpened(accountId, collection);
+
+    const activity = mostRecentActivity.getItems(accountId);
+    expect(activity).toEqual([
+      expect.objectContaining({
+        collectionId,
+        databaseId,
+      }),
+    ]);
+  });
+
+  it("Can record notebooks being opened", () => {
+    const name = "some notebook";
+    const path = "some path";
+    const notebook = { name, path };
+
+    mostRecentActivity.notebookWasItemOpened(accountId, notebook);
+
+    const activity = mostRecentActivity.getItems(accountId);
+    expect(activity).toEqual([expect.objectContaining(notebook)]);
+  });
+
+  it("Filters out duplicates", () => {
+    const name = "some notebook";
+    const path = "some path";
+    const notebook = { name, path };
+    const sameNotebook = { name, path };
+
+    mostRecentActivity.notebookWasItemOpened(accountId, notebook);
+    mostRecentActivity.notebookWasItemOpened(accountId, sameNotebook);
+
+    const activity = mostRecentActivity.getItems(accountId);
+    expect(activity.length).toEqual(1);
+    expect(activity).toEqual([expect.objectContaining(notebook)]);
+  });
+
+  it("Allows for multiple accounts", () => {
+    const name = "some notebook";
+    const path = "some path";
+    const notebook = { name, path };
+
+    const anotherNotebook = { name: "Another " + name, path };
+    const anotherAccountId = "Another " + accountId;
+
+    mostRecentActivity.notebookWasItemOpened(accountId, notebook);
+    mostRecentActivity.notebookWasItemOpened(anotherAccountId, anotherNotebook);
+
+    expect(mostRecentActivity.getItems(accountId)).toEqual([expect.objectContaining(notebook)]);
+    expect(mostRecentActivity.getItems(anotherAccountId)).toEqual([expect.objectContaining(anotherNotebook)]);
+  });
+
+  it("Can store multiple distinct elements, in FIFO order", () => {
+    const name = "some notebook";
+    const path = "some path";
+    const first = { name, path };
+    const second = { name: "Another " + name, path };
+    const third = { name, path: "Another " + path };
+
+    mostRecentActivity.notebookWasItemOpened(accountId, first);
+    mostRecentActivity.notebookWasItemOpened(accountId, second);
+    mostRecentActivity.notebookWasItemOpened(accountId, third);
+
+    const activity = mostRecentActivity.getItems(accountId);
+    expect(activity).toEqual([third, second, first].map(expect.objectContaining));
+  });
+});