test: add unit test for happy path for extract names function

Author: Eric-Zhang-Developer

src/lib/__tests__/extractNamesFromJson.test.ts

@@ -0,0 +1,35 @@
+import ExtractNamesFromJson from "../extractNamesFromJson";
+
+const data = [
+  {
+    title: "",
+    media_list_data: [],
+    string_list_data: [
+      {
+        href: "https://www.instagram.com/POTUS",
+        value: "POTUS",
+        timestamp: 2248397812,
+      },
+    ],
+  },
+  {
+    title: "",
+    media_list_data: [],
+    string_list_data: [
+      {
+        href: "https://www.instagram.com/NASA",
+        value: "NASA",
+        timestamp: 1267694584,
+      },
+    ],
+  },
+];
+
+describe("Extract Names Function Tests", () => {
+  describe("Core Logic", () => {
+    it("should return an array of usernames when a proper json is input", () => {
+      const result = ExtractNamesFromJson(data);
+      expect(result).toEqual(["POTUS", "NASA"]);
+    });
+  });
+});