테넌트 조회 Mock API 추가

devfront/tests/helpers/devfront-fixtures.ts

@@ -176,6 +176,12 @@ export async function installDevApiMock(page: Page, state: DevApiMockState) {
     const { pathname, searchParams } = url;
     const method = request.method();
 
+    if (pathname === "/api/v1/dev/my-tenants" && method === "GET") {
+      return json(route, [
+        { id: "tenant-a", name: "Tenant A", slug: "tenant-a" },
+      ]);
+    }
+
     if (pathname === "/api/v1/dev/stats" && method === "GET") {
       const total = state.clients.length;
       return json(route, {