1 files changed, 51 insertions, 0 deletions
diff --git a/packages/lsp/src/root.test.ts b/packages/lsp/src/root.test.ts
new file mode 100644
index 0000000..ffe2e31
--- /dev/null
+++ b/packages/lsp/src/root.test.ts
@@ -0,0 +1,51 @@
+import { describe, expect, it } from "vitest";
+import { findRoot } from "./root.js";
+
+describe("root", () => {
+	it("findRoot returns nearest marker ancestor bounded by cwd", async () => {
+		const existingFiles = new Set([
+			"/project/src/components/tsconfig.json",
+			"/project/tsconfig.json",
+		]);
+
+		const result = await findRoot(
+			"/project/src/components/widgets",
+			"/project",
+			["tsconfig.json"],
+			async (path) => existingFiles.has(path),
+		);
+
+		expect(result).toBe("/project/src/components");
+	});
+
+	it("falls back to cwd", async () => {
+		const result = await findRoot(
+			"/project/src/deep/nested",
+			"/project",
+			["tsconfig.json"],
+			async () => false,
+		);
+
+		expect(result).toBe("/project");
+	});
+
+	it("finds marker at start directory", async () => {
+		const existingFiles = new Set(["/project/tsconfig.json"]);
+
+		const result = await findRoot("/project", "/project", ["tsconfig.json"], async (path) =>
+			existingFiles.has(path),
+		);
+
+		expect(result).toBe("/project");
+	});
+
+	it("respects cwd boundary", async () => {
+		const existingFiles = new Set(["/tsconfig.json"]);
+
+		const result = await findRoot("/project/src", "/project", ["tsconfig.json"], async (path) =>
+			existingFiles.has(path),
+		);
+
+		expect(result).toBe("/project");
+	});
+});