feat: integrate Pi backend and Pi Web

pi-web/lib/initial-navigation.test.mjs

@@ -0,0 +1,46 @@
+import assert from "node:assert/strict";
+import test from "node:test";
+
+async function loadSubject() {
+  return import("./initial-navigation.ts");
+}
+
+test("uses cwd instead of session when both parameters are present", async () => {
+  const { getInitialNavigation } = await loadSubject();
+  const result = getInitialNavigation(new URLSearchParams({
+    cwd: " /work/project ",
+    session: "saved-session",
+  }));
+
+  assert.deepEqual(result, {
+    requestedCwd: "/work/project",
+    sessionId: null,
+  });
+});
+
+test("restores session when cwd is absent", async () => {
+  const { getInitialNavigation } = await loadSubject();
+
+  assert.deepEqual(
+    getInitialNavigation(new URLSearchParams({ session: "saved-session" })),
+    { requestedCwd: null, sessionId: "saved-session" },
+  );
+});
+
+test("treats an empty cwd as absent", async () => {
+  const { getInitialNavigation } = await loadSubject();
+
+  assert.deepEqual(
+    getInitialNavigation(new URLSearchParams({ cwd: "  ", session: "saved-session" })),
+    { requestedCwd: null, sessionId: "saved-session" },
+  );
+});
+
+test("preserves a URL-encoded Windows path", async () => {
+  const { getInitialNavigation } = await loadSubject();
+
+  assert.deepEqual(
+    getInitialNavigation(new URLSearchParams("cwd=C%3A%5CProjects%5Cpi-web")),
+    { requestedCwd: "C:\\Projects\\pi-web", sessionId: null },
+  );
+});