feat: Add testing framework and initial test cases for various tools and database operations

tests/fixtures/test-data.ts

@@ -0,0 +1,66 @@
+/**
+ * Test data fixtures
+ */
+
+import {
+  CodeSnippet,
+  Note,
+  Task,
+  BabyMilestone,
+  MathResource,
+  GameWishlist,
+} from "../../src/storage/database.js";
+
+export const testCodeSnippet: CodeSnippet = {
+  id: "test-snippet-1",
+  title: "Test Snippet",
+  code: "const x = 1;",
+  language: "typescript",
+  tags: ["test", "example"],
+  category: "utils",
+  createdAt: "2024-01-01T00:00:00.000Z",
+  updatedAt: "2024-01-01T00:00:00.000Z",
+};
+
+export const testNote: Note = {
+  id: "test-note-1",
+  title: "Test Note",
+  content: "This is a test note",
+  tags: ["test"],
+  createdAt: "2024-01-01T00:00:00.000Z",
+  updatedAt: "2024-01-01T00:00:00.000Z",
+};
+
+export const testTask: Task = {
+  id: "test-task-1",
+  title: "Test Task",
+  description: "This is a test task",
+  completed: false,
+  createdAt: "2024-01-01T00:00:00.000Z",
+};
+
+export const testBabyMilestone: BabyMilestone = {
+  id: "test-milestone-1",
+  title: "First Steps",
+  description: "Baby took first steps",
+  date: "2024-01-01",
+  createdAt: "2024-01-01T00:00:00.000Z",
+};
+
+export const testMathResource: MathResource = {
+  id: "test-math-1",
+  title: "Addition Problems",
+  content: "1 + 1 = 2",
+  grade: "1st",
+  difficulty: "easy",
+  tags: ["addition"],
+  createdAt: "2024-01-01T00:00:00.000Z",
+};
+
+export const testGameWishlist: GameWishlist = {
+  id: "test-game-1",
+  gameName: "Test Game",
+  platform: "PC",
+  notes: "Want to play this",
+  addedAt: "2024-01-01T00:00:00.000Z",
+};