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Added tests for fetch-middlewares

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Kir_Antipov 2024-01-11 17:35:02 +00:00
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tests/unit/utils/net/fetch-middlewares.spec.ts Normal file
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import { HttpResponse } from "@/utils/net/http-response";
import { HttpError } from "@/utils/errors";
import { defaultResponse, simpleCache, throwOnError } from "@/utils/net/fetch-middlewares";
describe("defaultResponse", () => {
test("returns default response when filter condition is met", async () => {
const middleware = defaultResponse({
filter: x => x.status === 404,
response: x => HttpResponse.text("Foo", x),
});
const next = jest.fn().mockResolvedValue(HttpResponse.text("Foo", { status: 404 }));
const response = await middleware("http://example.com/", {}, next);
const responseText = await response.text();
expect(next).toBeCalledWith("http://example.com/", {});
expect(response.status).toBe(404);
expect(responseText).toBe("Foo");
});
test("returns original response when filter condition is not met", async () => {
const middleware = defaultResponse({
filter: x => x.status === 404,
response: x => HttpResponse.text("Foo", x),
});
const next = jest.fn().mockResolvedValue(HttpResponse.text("Success", { status: 200 }));
const response = await middleware("http://example.com/", {}, next);
const responseText = await response.text();
expect(next).toBeCalledWith("http://example.com/", {});
expect(response.status).toBe(200);
expect(responseText).toBe("Success");
});
test("uses default filter and response factory when options are not provided", async () => {
const middleware = defaultResponse();
const next = jest.fn().mockResolvedValue(HttpResponse.text("Foo", { status: 404 }));
const response = await middleware("http://example.com/", {}, next);
const responseText = await response.text();
expect(next).toBeCalledWith("http://example.com/", {});
expect(response.status).toBe(404);
expect(responseText).toBe("");
});
});
describe("throwOnError", () => {
test("throws error when filter condition is met", async () => {
const middleware = throwOnError({
filter: x => x.status === 404,
error: x => new Error(`HTTP Error: ${x.status}`),
});
const next = jest.fn().mockResolvedValue(HttpResponse.text("Foo", { status: 404 }));
const responsePromise = middleware("http://example.com/", {}, next);
await expect(responsePromise).rejects.toThrow("HTTP Error: 404");
expect(next).toBeCalledWith("http://example.com/", {});
});
test("returns original response when filter condition is not met", async () => {
const middleware = throwOnError({
filter: x => x.status === 404,
error: x => new Error(`HTTP Error: ${x.status}`),
});
const next = jest.fn().mockResolvedValue(HttpResponse.text("Success", { status: 200 }));
const response = await middleware("http://example.com/", {}, next);
const responseText = await response.text();
expect(next).toBeCalledWith("http://example.com/", {});
expect(response.status).toBe(200);
expect(responseText).toBe("Success");
});
test("uses default filter and error factory when options are not provided", async () => {
const middleware = throwOnError();
const next = jest.fn().mockResolvedValue(HttpResponse.text("Foo", { status: 404 }));
const responsePromise = middleware("http://example.com/", {}, next);
await expect(responsePromise).rejects.toThrow(HttpError);
expect(next).toBeCalledWith("http://example.com/", {});
});
});
describe("simpleCache", () => {
test("returns cached response when filter condition is met", async () => {
const middleware = simpleCache({
filter: url => String(url).includes("useCache=true"),
comparer: ([urlA, { method: methodA }], [urlB, { method: methodB }]) => String(urlA) === String(urlB) && methodA === methodB,
});
const next = jest.fn().mockResolvedValue(HttpResponse.text("Cached", { status: 200 }));
const response1 = await middleware("http://example.com/?useCache=true", {}, next);
const responseText1 = await response1.text();
const response2 = await middleware("http://example.com/?useCache=true", {}, next);
const responseText2 = await response2.text();
expect(next).toBeCalledTimes(1);
expect(response1.status).toBe(200);
expect(responseText1).toBe("Cached");
expect(response2.status).toBe(200);
expect(responseText2).toBe("Cached");
});
test("returns new response when filter condition is not met", async () => {
const middleware = simpleCache({
filter: url => String(url).includes("useCache=true"),
comparer: ([urlA, { method: methodA }], [urlB, { method: methodB }]) => String(urlA) === String(urlB) && methodA === methodB,
});
const next = jest.fn().mockImplementation(() => Promise.resolve(HttpResponse.text("Not Cached", { status: 200 })));
const response1 = await middleware("http://example.com/", {}, next);
const responseText1 = await response1.text();
const response2 = await middleware("http://example.com/", {}, next);
const responseText2 = await response2.text();
expect(next).toBeCalledTimes(2);
expect(response1.status).toBe(200);
expect(responseText1).toBe("Not Cached");
expect(response2.status).toBe(200);
expect(responseText2).toBe("Not Cached");
});
test("uses default filter and comparer when options are not provided", async () => {
const middleware = simpleCache();
const next = jest.fn().mockResolvedValue(HttpResponse.text("Cached", { status: 200 }));
const response1 = await middleware("http://example.com/?cache=true", {}, next);
const responseText1 = await response1.text();
const response2 = await middleware("http://example.com/?cache=true", {}, next);
const responseText2 = await response2.text();
expect(next).toBeCalledTimes(1);
expect(response1.status).toBe(200);
expect(responseText1).toBe("Cached");
expect(response2.status).toBe(200);
expect(responseText2).toBe("Cached");
});
});