chore: migrate test cases from Chai to Jest

src/util/assert.spec.ts

@@ -0,0 +1,16 @@
+import { assert } from './assert'
+
+describe('assert', function () {
+  it('should not throw if predicate is truthy', function () {
+    const fn = () => assert('foo', () => 'bar')
+    expect(fn).not.toThrow()
+  })
+  it('should not throw if predicate is truthy', function () {
+    const fn = () => assert('', () => 'bar')
+    expect(fn).toThrow(/bar/)
+  })
+  it('should populate default message', function () {
+    const fn = () => assert(false)
+    expect(fn).toThrow(/expect false to be true/)
+  })
+})