chore: uses assert.expect in tests

Author: Pixelik

tests/acceptance/root-test.js

@@ -36,6 +36,8 @@ module('Acceptance: Root', function (hooks) {
   });
 
   test('posting a string', function (assert) {
+    assert.expect(3);
+
     server.post('/upload', function (req) {
       assert.strictEqual(req.requestBody, 'foo');
       return [
@@ -59,6 +61,8 @@ module('Acceptance: Root', function (hooks) {
   });
 
   test('posting a form', function (assert) {
+    assert.expect(3);
+
     server.post('/upload', function (req) {
       assert.ok(req.requestBody instanceof window.FormData);
       return [
@@ -84,6 +88,8 @@ module('Acceptance: Root', function (hooks) {
   });
 
   test('posting an array buffer', function (assert) {
+    assert.expect(3);
+
     server.post('/upload', function (req) {
       assert.ok(req.requestBody instanceof window.ArrayBuffer);
       return [