From 7392219fe3bf02b567f7993567de3068a86e1a5f Mon Sep 17 00:00:00 2001
From: Kir_Antipov <kp.antipov@gmail.com>
Date: Thu, 11 Jan 2024 17:51:12 +0000
Subject: [PATCH] Added tests for `fetch`

---
 tests/unit/utils/net/fetch.spec.ts | 110 +++++++++++++++++++++++++++++
 1 file changed, 110 insertions(+)
 create mode 100644 tests/unit/utils/net/fetch.spec.ts

diff --git a/tests/unit/utils/net/fetch.spec.ts b/tests/unit/utils/net/fetch.spec.ts
new file mode 100644
index 0000000..bca695c
--- /dev/null
+++ b/tests/unit/utils/net/fetch.spec.ts
@@ -0,0 +1,110 @@
+import { HttpResponse } from "@/utils/net/http-response";
+import { getHeader } from "@/utils/net/headers";
+import { createFetch, fetch, fetchDestinationEquals } from "@/utils/net/fetch";
+
+describe("fetch", () => {
+    test("is defined", () => {
+        expect(fetch).toBeDefined();
+    });
+
+    test("is able to access the Internet", async () => {
+        const response = await fetch("https://google.com/");
+
+        expect(response.ok).toBe(true);
+    });
+});
+
+describe("createFetch", () => {
+    test("returns a new fetch instance", () => {
+        const fetchInstance = createFetch();
+
+        expect(typeof fetchInstance).toBe("function");
+        expect(fetchInstance).not.toBe(fetch);
+        expect(fetchInstance).toHaveProperty("baseUrl");
+        expect(fetchInstance).toHaveProperty("defaultHeaders");
+        expect(fetchInstance).toHaveProperty("use");
+    });
+
+    test("creates a configured fetch instance", async () => {
+        const handler = jest.fn().mockResolvedValueOnce(HttpResponse.text("Success", { status: 200 }));
+        const fetchInstance = createFetch({
+            handler,
+            baseUrl: "http://example.com",
+            defaultHeaders: { "X-Test": "Test" },
+        });
+
+        const response = await fetchInstance("/foo");
+        const responseText = await response.text();
+
+        expect(fetchInstance).not.toBe(fetch);
+        expect(fetchInstance.baseUrl).toBe("http://example.com");
+        expect(getHeader(fetchInstance.defaultHeaders, "X-Test")).toBe("Test");
+        expect(response.status).toBe(200);
+        expect(responseText).toBe("Success");
+        expect(handler).toBeCalledTimes(1);
+        expect(handler).toBeCalledWith(new URL("http://example.com/foo"), { headers: { "X-Test": "Test" } });
+    });
+
+    test("uses default options when not provided", () => {
+        const fetchInstance = createFetch();
+
+        expect(fetchInstance).not.toBe(fetch);
+        expect(fetchInstance.baseUrl).toBeUndefined();
+        expect(fetchInstance.defaultHeaders).toBeDefined();
+    });
+
+    test("configured fetch executes a middleware pipeline on call", async () => {
+        const handler = jest.fn().mockResolvedValueOnce(HttpResponse.text("Success", { status: 200 }));
+        const middleware = jest.fn().mockImplementation((url, request, next) => next(url, request));
+        const fetchInstance = createFetch({ handler }).use(middleware);
+
+        const response = await fetchInstance("http://example.com");
+        const responseText = await response.text();
+
+        expect(fetchInstance).not.toBe(fetch);
+        expect(response.status).toBe(200);
+        expect(responseText).toBe("Success");
+        expect(handler).toBeCalledTimes(1);
+        expect(handler).toBeCalledWith("http://example.com", undefined);
+        expect(middleware).toBeCalledTimes(1);
+        expect(middleware).toBeCalledWith("http://example.com", undefined, expect.anything());
+    });
+});
+
+describe("fetchDestinationEquals", () => {
+    test("returns true when both URLs and methods are the same", () => {
+        const result = fetchDestinationEquals(["http://example.com/foo", "GET"], ["http://example.com/foo", "GET"]);
+
+        expect(result).toBe(true);
+    });
+
+    test("returns true when both URLs are the same and methods represent the 'GET' method", () => {
+        const result = fetchDestinationEquals(["http://example.com/foo", "GET"], ["http://example.com/foo", "" as "GET"]);
+
+        expect(result).toBe(true);
+    });
+
+    test("returns false when URLs are different", () => {
+        const result = fetchDestinationEquals(["http://example.com/foo", "GET"], ["http://example.com/bar", "GET"]);
+
+        expect(result).toBe(false);
+    });
+
+    test("returns false when methods are different", () => {
+        const result = fetchDestinationEquals(["http://example.com/foo", "GET"], ["http://example.com/foo", "POST"]);
+
+        expect(result).toBe(false);
+    });
+
+    test("returns true when comparing equal URLs without methods", () => {
+        const result = fetchDestinationEquals("http://example.com/foo", "http://example.com/foo");
+
+        expect(result).toBe(true);
+    });
+
+    test("returns false when comparing URLs without methods and URLs are different", () => {
+        const result = fetchDestinationEquals("http://example.com/foo", "http://example.com/bar");
+
+        expect(result).toBe(false);
+    });
+});