test: added test & refactored files

tests/fetchRepo.test.js

@@ -0,0 +1,83 @@
+require("@testing-library/jest-dom");
+const axios = require("axios");
+const MockAdapter = require("axios-mock-adapter");
+const fetchRepo = require("../src/fetchRepo");
+
+const data_repo = {
+  repository: {
+    name: "convoychat",
+    stargazers: { totalCount: 38000 },
+    description: "Help us take over the world! React + TS + GraphQL Chat App",
+    primaryLanguage: {
+      color: "#2b7489",
+      id: "MDg6TGFuZ3VhZ2UyODc=",
+      name: "TypeScript",
+    },
+    forkCount: 100,
+  },
+};
+
+const data_user = {
+  data: {
+    user: { repository: data_repo },
+    organization: null,
+  },
+};
+const data_org = {
+  data: {
+    user: null,
+    organization: { repository: data_repo },
+  },
+};
+
+const mock = new MockAdapter(axios);
+
+afterEach(() => {
+  mock.reset();
+});
+
+describe("Test fetchRepo", () => {
+  it("should fetch correct user repo", async () => {
+    mock.onPost("https://api.github.com/graphql").reply(200, data_user);
+
+    let repo = await fetchRepo("anuraghazra", "convoychat");
+    expect(repo).toStrictEqual(data_repo);
+  });
+
+  it("should fetch correct org repo", async () => {
+    mock.onPost("https://api.github.com/graphql").reply(200, data_org);
+
+    let repo = await fetchRepo("anuraghazra", "convoychat");
+    expect(repo).toStrictEqual(data_repo);
+  });
+
+  it("should throw error if user is found but repo is null", async () => {
+    mock
+      .onPost("https://api.github.com/graphql")
+      .reply(200, { data: { user: { repository: null }, organization: null } });
+
+    await expect(fetchRepo("anuraghazra", "convoychat")).rejects.toThrow(
+      "User Repository Not found"
+    );
+  });
+
+  it("should throw error if org is found but repo is null", async () => {
+    mock
+      .onPost("https://api.github.com/graphql")
+      .reply(200, { data: { user: null, organization: { repository: null } } });
+
+    await expect(fetchRepo("anuraghazra", "convoychat")).rejects.toThrow(
+      "Organization Repository Not found"
+    );
+  });
+
+  it("should throw error if both user & org data not found", async () => {
+    mock
+      .onPost("https://api.github.com/graphql")
+      .reply(200, { data: { user: null, organization: null } });
+
+    await expect(fetchRepo("anuraghazra", "convoychat")).rejects.toThrow(
+      "Not found"
+    );
+  });
+});