♻️ refactor: split into testable modules, add test suite

src/libs/public-ip.test.ts

@@ -0,0 +1,47 @@
+import { beforeEach, describe, expect, mock, test } from "bun:test";
+
+const axiosGet = mock();
+
+mock.module("axios", () => ({
+  default: { get: axiosGet },
+}));
+
+const { getCurrentIPv4, getCurrentIPv6 } = await import("./public-ip");
+
+describe("getCurrentIPv4", () => {
+  beforeEach(() => axiosGet.mockReset());
+
+  test("returns the ip when a valid IPv4 address is returned", async () => {
+    axiosGet.mockResolvedValue({ data: { ip: "1.2.3.4" } });
+    expect(await getCurrentIPv4()).toBe("1.2.3.4");
+  });
+
+  test("throws when no ip is returned", async () => {
+    axiosGet.mockResolvedValue({ data: {} });
+    await expect(getCurrentIPv4()).rejects.toThrow("Unable to fetch ip address");
+  });
+
+  test("throws when the returned ip is not a valid IPv4 address", async () => {
+    axiosGet.mockResolvedValue({ data: { ip: "not-an-ip" } });
+    await expect(getCurrentIPv4()).rejects.toThrow("Invalid IP");
+  });
+});
+
+describe("getCurrentIPv6", () => {
+  beforeEach(() => axiosGet.mockReset());
+
+  test("returns the ip when a valid IPv6 address is returned", async () => {
+    axiosGet.mockResolvedValue({ data: { ip: "::1" } });
+    expect(await getCurrentIPv6()).toBe("::1");
+  });
+
+  test("returns null when the returned value is not a valid IPv6 address", async () => {
+    axiosGet.mockResolvedValue({ data: { ip: "1.2.3.4" } });
+    expect(await getCurrentIPv6()).toBeNull();
+  });
+
+  test("throws when no ip is returned", async () => {
+    axiosGet.mockResolvedValue({ data: {} });
+    await expect(getCurrentIPv6()).rejects.toThrow("Unable to fetch ip address");
+  });
+});