https://github.com/satyarohith/metch

A Deno module to mock fetch() calls.
https://github.com/satyarohith/metch

deno fetch mock testing

Last synced: about 1 year ago
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A Deno module to mock fetch() calls.

• Host: GitHub
• URL: https://github.com/satyarohith/metch
• Owner: satyarohith
• License: mit
• Created: 2021-03-19T18:20:10.000Z (over 5 years ago)
• Default Branch: main
• Last Pushed: 2021-05-24T12:38:14.000Z (about 5 years ago)
• Last Synced: 2025-05-08T03:15:38.699Z (about 1 year ago)
• Topics: deno, fetch, mock, testing
• Language: TypeScript
• Homepage: https://deno.land/x/metch
• Size: 5.86 KB
• Stars: 7
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: readme.md
  • License: LICENSE

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README

          
# metch

A Deno module to mock `fetch()`.

```ts

import { mockFetch, unMockFetch } from "https://deno.land/x/metch/mod.ts";

import { assertEquals } from "https://deno.land/std@0.90.0/testing/asserts.ts";

Deno.test("mocks fetch() as expected", async () => {

  const request1 = new Request("https://example.com");

  const expectedResponse1 = new Response(" example.com ", {

    status: 200,

    headers: {

      "content-type": "text/html",

    },

  });

  const request2 = new Request("https://example.rest");

  const expectedResponse2 = new Response(

    JSON.stringify({ message: "example" }),

    {

      status: 200,

      headers: {

        "content-type": "text/html",

      },

    },

  );

  // Pass a request object and a response object which

  // will be used to respond to fetch().

  await mockFetch(request1, expectedResponse1.clone());

  // Call again to mock more requests.

  await mockFetch(request2, expectedResponse2.clone());

  const response1 = await fetch(request1);

  const response2 = await fetch(request2);

  assertEquals(response1.status, expectedResponse1.status);

  assertEquals(await response1.text(), await expectedResponse1.text());

  assertEquals(

    response1.headers.get("content-type"),

    expectedResponse1.headers.get("content-type"),

  );

  assertEquals(response2.status, expectedResponse2.status);

  assertEquals(await response2.text(), await expectedResponse2.text());

  assertEquals(

    response2.headers.get("content-type"),

    expectedResponse2.headers.get("content-type"),

  );

  // Restore original fetch().

  unMockFetch();

});

```