feat: add vitest, vite, move to tdd

src/utils/markdown.test.ts

@@ -0,0 +1,81 @@
+import { describe, it, expect } from "vitest";
+import { parseTaskFile, serializeTask } from "./markdown";
+import { Task } from "@/model/task";
+
+const fullTask: Task = {
+	id: "550e8400-e29b-41d4-a716-446655440000",
+	title: "Пофиксить баг логина",
+	description: "Ошибка валидации токена",
+	status: "in-progress",
+	priority: "high",
+	tags: ["bug", "frontend"],
+	assignee: "ivanov",
+	created: "2026-07-12T10:00:00.000Z",
+	updated: "2026-07-12T10:00:00.000Z",
+};
+
+describe("markdown", () => {
+	it("parses a .task.md file with full frontmatter", () => {
+		const content = [
+			"---",
+			'id: "550e8400-e29b-41d4-a716-446655440000"',
+			'title: "Пофиксить баг логина"',
+			"status: in-progress",
+			"priority: high",
+			"tags: [bug, frontend]",
+			'assignee: "ivanov"',
+			"created: 2026-07-12T10:00:00.000Z",
+			"updated: 2026-07-12T10:00:00.000Z",
+			"---",
+			"Ошибка валидации токена",
+		].join("\n");
+
+		const task = parseTaskFile(content);
+		expect(task).toEqual(fullTask);
+	});
+
+	it("fills defaults for missing fields", () => {
+		const content = [
+			"---",
+			'id: "abc"',
+			'title: "Minimal"',
+			"---",
+			"",
+		].join("\n");
+
+		const task = parseTaskFile(content);
+		expect(task.id).toBe("abc");
+		expect(task.title).toBe("Minimal");
+		expect(task.description).toBe("");
+		expect(task.status).toBe("todo");
+		expect(task.priority).toBe("medium");
+		expect(task.tags).toEqual([]);
+		expect(task.assignee).toBe("");
+		expect(task.created).toBeTruthy();
+		expect(task.updated).toBeTruthy();
+	});
+
+	it("serializeTask produces valid frontmatter", () => {
+		const result = serializeTask(fullTask);
+		expect(result).toContain("---");
+		expect(result).toContain("title: Пофиксить баг логина");
+		expect(result).toContain("status: in-progress");
+		expect(result).toContain("Ошибка валидации токена");
+	});
+
+	it("round-trip: serialize → parse produces the same task", () => {
+		const serialized = serializeTask(fullTask);
+		const parsed = parseTaskFile(serialized);
+		expect(parsed).toEqual(fullTask);
+	});
+
+	it("description with utf-8 survives round-trip", () => {
+		const task: Task = {
+			...fullTask,
+			description: "Тестовая задача с кириллицей\nи переносом строки",
+		};
+		const serialized = serializeTask(task);
+		const parsed = parseTaskFile(serialized);
+		expect(parsed.description).toBe(task.description);
+	});
+});