test: add status flow test

tests/integration/taskStatus.test.ts

@@ -0,0 +1,51 @@
+import { describe, expect, it } from "vitest";
+import { TaskStatus } from "@/model/taskStatus";
+import { InMemoryFileSystem } from "../helpers/InMemoryFileSystem";
+import { parseTaskFile } from "@/utils/markdown";
+
+const FS = new InMemoryFileSystem();
+const FILE = "/tasks/test.xflow.md";
+
+describe("task status integration", () => {
+	it("parses valid status from file", async () => {
+		await FS.writeFile(
+			FILE,
+			[
+				"---",
+				'id: "abc"',
+				'title: "Test"',
+				"status: open",
+				"---",
+				"",
+				"Body",
+			].join("\n"),
+		);
+
+		const raw = await FS.readFile(FILE);
+		const task = parseTaskFile(raw);
+		expect(task.status).toBe(TaskStatus.OPEN);
+	});
+
+	it("returns UNKNOWN after manually changing status to invalid value in file", async () => {
+		await FS.writeFile(
+			FILE,
+			[
+				"---",
+				'id: "abc"',
+				'title: "Test"',
+				"status: open",
+				"---",
+				"",
+				"Body",
+			].join("\n"),
+		);
+
+		const raw = await FS.readFile(FILE);
+		const modified = raw.replace("status: open", "status: __not_a_status__");
+		await FS.writeFile(FILE, modified);
+
+		const final = await FS.readFile(FILE);
+		const task = parseTaskFile(final);
+		expect(task.status).toBe(TaskStatus.UNKNOWN);
+	});
+});