test: add SSR unit-test

test/SSR.test.tsx

@@ -0,0 +1,24 @@
+import { renderHook } from "@testing-library/react";
+import { useAuth } from "../src/useAuth";
+import { createWrapper } from "./helpers";
+
+// force Node environment (no window)
+jest.unmock("oidc-client-ts");
+
+describe("In a Node SSR environment", () => {
+    it("auth state is initialised", async () => {
+        // arrange
+        const wrapper = createWrapper({
+            authority: "authority",
+            client_id: "client",
+            redirect_uri: "redirect" });
+
+        const { result } = renderHook(() => useAuth(), {
+            wrapper,
+        });
+
+        expect(result.current.isLoading).toBeTruthy();
+        expect(result.current.isAuthenticated).toBeFalsy();
+        expect(result.current.user).toBeUndefined();
+    });
+});