update unit tests

squarenotsquare/__tests__/Nav-test.js

@@ -1,6 +1,6 @@
-import { squareRef, navigate } from "../src/navigation/SquareNav";
+import { squareRef, squareNav } from "../src/navigation/SquareNav";
 
 test('SquareNav calls navigation ref', () => {
-  let postNav = navigate('notascreen', {});
+  let postNav = squareNav('notascreen', {});
   expect(postNav).toEqual(true);
 });