1 files changed, 51 insertions, 0 deletions
diff --git a/tests/notes.test.js b/tests/notes.test.js
new file mode 100644
index 0000000..079642d
--- /dev/null
+++ b/tests/notes.test.js
@@ -0,0 +1,51 @@
+import { jest } from "@jest/globals";
+
+jest.unstable_mockModule("../src/db.js", () => ({
+  insertDB: jest.fn(),
+  getDB: jest.fn(),
+  saveDB: jest.fn(),
+}));
+
+const { insertDB, getDB, saveDB } = await import("../src/db.js");
+const { newNote, getAllNotes, removeNote } = await import("../src/notes.js");
+
+beforeEach(() => {
+  insertDB.mockClear();
+  getDB.mockClear();
+  saveDB.mockClear();
+});
+
+test("newNote inserts data and returns it", async () => {
+  const note = {
+    content: "this is a new note",
+    id: 1,
+    tags: ["test"],
+  };
+  insertDB.mockResolvedValue(note);
+  const result = await newNote(note.content, note.tags);
+  expect(result.content).toEqual(note.content);
+  expect(result.tags).toEqual(note.tags);
+});
+
+test("getAllNotes returns all notes", async () => {
+  const db = {
+    notes: ["note1", "note2", "note3"],
+  };
+  getDB.mockResolvedValue(db);
+
+  const result = await getAllNotes();
+  expect(result).toEqual(db.notes);
+});
+
+test("removeNote does nothing if id is not found", async () => {
+  const notes = [
+    { id: 1, content: "note 1" },
+    { id: 2, content: "note 2" },
+    { id: 3, content: "note 3" },
+  ];
+  saveDB.mockResolvedValue(notes);
+
+  const idToRemove = 4;
+  const result = await removeNote(idToRemove);
+  expect(result).toBeUndefined();
+});