docs: add count assertions wiki page to legacy docs

Signed-off-by: Kelechi Ebiri <ebiritg@gmail.com>

docs/api-tutorials/count-assertions.md

@@ -0,0 +1,48 @@
+While Mocha itself does not provide an assertion layer and cannot provide assertion counting, it's relatively easy to integrate this behavior using hooks. The following is a simplified version of an assertion counter:
+
+```js
+
+var expected = 0;
+var actual = 0;
+
+function assert(expr, msg) {
+  if (!expr) throw new Error(msg || 'assertion failed');
+  actual++;
+}
+
+function expect(n) {
+  expected = n;
+}
+
+function reset() {
+  expected = 0;
+  actual = 0;
+}
+
+function check() {
+  if (!expected || expected == actual) return;
+  var err = new Error('expected ' + expected + ' assertions, got ' + actual);
+  this.currentTest.emit('error', err);
+}
+
+beforeEach(reset);
+afterEach(check);
+
+describe('something', function() {
+  it('should work', function(done){
+    expect(2);
+
+    setTimeout(function() {
+      assert('wahoo')
+    }, 50);
+
+    setTimeout(function() {
+      assert('hey')
+    }, 50);
+
+    setTimeout(function() {
+      done();
+    }, 100);
+  })
+})
+```

docs/api-tutorials/jsdoc.tutorials.json

@@ -1,4 +1,7 @@
 {
+  "count-assertions": {
+    "title": "Count assertions"
+  },
   "custom-reporter": {
     "title": "Create a Custom Reporter"
   },