fix: include test utility

Author: feildmaster

test/counter.js

@@ -0,0 +1,43 @@
+import { Assertion, expect } from 'chai';
+
+class Counter {
+  constructor() {
+    this.count = 0;
+  }
+
+  increment() {
+    this.count += 1;
+  }
+
+  reset() {
+    this.count = 0;
+  }
+
+  assert(expected, message) {
+    const count = this.count;
+    this.reset();
+    expect(count, message || `Expected ${expected} assertions, counted ${count}`)
+      .to.equal(expected);
+  }
+
+  assertPromised(expected, message) {
+    const count = this.count;
+    this.reset();
+    return expect(count, message || `Expected ${expected} assertions, counted ${count}`)
+      .to.eventually.equal(expected);
+  }
+}
+
+const counter = new Counter();
+
+Assertion.addMethod('inc', () => counter.increment());
+
+export function assert(expected = 0, message = '') {
+  if (!Number.isFinite(expected) || expected < 0) return;
+  counter.assert(expected, message);
+}
+
+export function assertPromised(expected = 0, message = '') {
+  if (!Number.isFinite(expected) || expected < 0) return Promise.resolve();
+  return counter.assertPromised(expected, message);
+}