troubleshooting test environment

I was running into issues where jest wasn't defined. Moving it to __test__ directory seemed to resolve the issue.

I also added jest-fetch-mock, which resolved some mocking issues. I might remove it.

tests/client.test.js → __tests__/client.test.js

@@ -1,4 +1,9 @@
 import MistralClient from "../dist/client.module.js";
+import fetchMock from "jest-fetch-mock";
+
+beforeEach(() => {
+  fetch.resetMocks();
+});
 
 describe("MistralClient Constructor", () => {
   it("should initialize with default values if no arguments are provided", () => {
@@ -39,3 +44,25 @@ describe("MistralClient Constructor", () => {
     }).toThrow("MistralClient was not provided a valid API key");
   });
 });
+
+describe("MistralClient", () => {
+  it("chat() sends a request and handles response correctly", async () => {
+    const mockApiKey = "test-api-key";
+    const mockEndpoint = "https://mock.api";
+    const mockModel = "mistral-tiny";
+    const mockMessages = [{ role: "user", content: "Hello, world!" }];
+
+    // Mocking the fetch response
+    fetchMock.mockResponseOnce(JSON.stringify({ success: true }));
+
+    const client = new MistralClient(mockApiKey, mockEndpoint);
+
+    await client.chat({
+      model: mockModel,
+      messages: mockMessages,
+    });
+
+    // Checking if the fetch was called correctly
+    expect(fetch).toHaveBeenCalledTimes(1);
+  });
+});

package.json

@@ -23,9 +23,13 @@
     "build": "microbundle",
     "dev": "microbundle watch",
     "lint": "./node_modules/.bin/eslint .",
-    "test": "npm run build && node --experimental-vm-modules node_modules/.bin/jest"
+    "test": "node --experimental-vm-modules node_modules/.bin/jest"
   },
   "jest": {
+    "automock": false,
+    "setupFiles": [
+      "./scripts/setupJest.js"
+    ],
     "testPathIgnorePatterns": [
       "examples"
     ]
@@ -38,6 +42,7 @@
     "eslint": "^8.55.0",
     "eslint-config-google": "^0.14.0",
     "jest": "^29.7.0",
+    "jest-fetch-mock": "^3.0.3",
     "microbundle": "^0.15.1",
     "prettier": "2.8.8",
     "typescript": "^5.3.3"

scripts/setupJest.js

@@ -0,0 +1,6 @@
+// adds the 'fetchMock' global variable and rewires 'fetch' global to call 'fetchMock' instead of the real implementation
+import jestMock from "jest-fetch-mock";
+jestMock.enableMocks();
+
+// changes default behavior of fetchMock to use the real 'fetch' implementation and not mock responses
+fetchMock.dontMock();