feat: test file

Author: themakunga

.nvmrc

@@ -1 +1 @@
-18 
+18.20.2

jest.config.js

@@ -0,0 +1,14 @@
+/** @type {import('ts-jest').JestConfigWithTsJest} */
+module.exports = {
+  preset: 'ts-jest',
+  testEnvironment: 'node',
+  collectCoverageFrom: ['./src/**/*'],
+  coverageThreshold: {
+    global: {
+      branches: 90,
+      functions: 90,
+      lines: 90,
+      statements: 90,
+    },
+  },
+};

jest.config.json

@@ -8,7 +8,7 @@
   "description": "A native node fetch wrapper",
   "main": "lib/index.js",
   "scripts": {
-    "test": "echo \"Error: no test specified\" && exit 1"
+    "test": "jest"
   },
   "engines": {
     "node": "18"
@@ -36,6 +36,7 @@
     "@commitlint/cli": "^18.4.3",
     "@commitlint/config-conventional": "^18.4.3",
     "@cspell/dict-es-es": "^2.3.0",
+    "@jest/globals": "^29.7.0",
     "@stryker-mutator/core": "^7.3.0",
     "@stryker-mutator/jest-runner": "^7.3.0",
     "@types/jest": "^29.5.10",

package.json

@@ -1,3 +1,65 @@
 import * as utils from '.';
 
-declare('Utils', () => {});
+const nullVal = null;
+
+describe('Utils', () => {
+  it('isArray - should return true', () => {
+    const testVal: string[] = ['a', 'b', 'c'];
+    const result = utils.isArray(testVal);
+
+    expect(result).toBe(true);
+  });
+  it('isArray - should return false', () => {
+    const res = utils.isArray(nullVal);
+
+    expect(res).toBe(false);
+  });
+
+  it('isUndefinided - should return true', () => {
+    const testVal = undefined;
+    const res = utils.isUndef(testVal);
+
+    expect(res).toBe(true);
+  });
+  it('isUndefinided - should return false', () => {
+    const res = utils.isUndef(nullVal);
+
+    expect(res).toBe(false);
+  });
+
+  it('isBuffer - should return true', () => {
+    const testval = Buffer.from('test', 'utf8');
+    const res = utils.isBuffer(testval);
+
+    expect(res).toBe(true);
+  });
+  it('isBuffer - should return false', () => {
+    const res = utils.isBuffer(nullVal);
+
+    expect(res).toBe(false);
+  });
+
+  it('isArrayBuffer - should be true', () => {
+    const testval: ArrayBuffer = new ArrayBuffer(8);
+    const res = utils.isArrayBuffer(testval);
+
+    expect(res).toBe(true);
+  });
+  it('isArrayBuffer - should be false', () => {
+    const res = utils.isArrayBuffer(nullVal);
+
+    expect(res).toBe(false);
+  });
+
+  it('isArrayBufferView - should be true', () => {
+    const testval = new Int32Array(new ArrayBuffer(8));
+    const res = utils.isArrayBufferView(testval);
+
+    expect(res).toBe(true);
+  });
+  it('isArrayBufferView - should be false', () => {
+    const res = utils.isArrayBufferView(nullVal);
+
+    expect(res).toBeFalsy();
+  });
+});