init commit,

99_references/voyager-main/src/setupTests.ts

@@ -0,0 +1,27 @@
+// jest-dom adds custom jest matchers for asserting on DOM nodes.
+// allows you to do things like:
+// expect(element).toHaveTextContent(/react/i)
+// learn more: https://github.com/testing-library/jest-dom
+import "@testing-library/jest-dom";
+
+// Mock matchmedia
+window.matchMedia =
+  window.matchMedia ||
+  function () {
+    return {
+      matches: false,
+      addListener: function () {},
+      removeListener: function () {},
+      addEventListener: function () {},
+      removeEventListener: function () {},
+    };
+  };
+
+window.localStorage = window.localStorage || {
+  setItem(key, item) {
+    this.state[key] = item;
+  },
+  getItem(key) {
+    return this.state[key];
+  },
+};