Run tests on PHP 7.4

Author: clue

.travis.yml

@@ -6,6 +6,9 @@ php:
   - 5.6
   - 7.0
   - 7.1
+  - 7.2
+  - 7.3
+  - 7.4
   - nightly # ignore errors, see below
   - hhvm # ignore errors, see below
 

tests/DeferredTest.php

@@ -44,6 +44,8 @@ public function progressIsAnAliasForNotify()
     public function shouldRejectWithoutCreatingGarbageCyclesIfCancellerRejectsWithException()
     {
         gc_collect_cycles();
+        gc_collect_cycles(); // clear twice to avoid leftovers in PHP 7.4 with ext-xdebug and code coverage turned on
+
         $deferred = new Deferred(function ($resolve, $reject) {
             $reject(new \Exception('foo'));
         });
@@ -57,6 +59,8 @@ public function shouldRejectWithoutCreatingGarbageCyclesIfCancellerRejectsWithEx
     public function shouldRejectWithoutCreatingGarbageCyclesIfParentCancellerRejectsWithException()
     {
         gc_collect_cycles();
+        gc_collect_cycles(); // clear twice to avoid leftovers in PHP 7.4 with ext-xdebug and code coverage turned on
+
         $deferred = new Deferred(function ($resolve, $reject) {
             $reject(new \Exception('foo'));
         });

tests/FulfilledPromiseTest.php

@@ -52,6 +52,8 @@ public function shouldThrowExceptionIfConstructedWithAPromise()
     public function shouldNotLeaveGarbageCyclesWhenRemovingLastReferenceToFulfilledPromiseWithAlwaysFollowers()
     {
         gc_collect_cycles();
+        gc_collect_cycles(); // clear twice to avoid leftovers in PHP 7.4 with ext-xdebug and code coverage turned on
+
         $promise = new FulfilledPromise(1);
         $promise->always(function () {
             throw new \RuntimeException();

tests/PromiseTest.php

@@ -52,6 +52,8 @@ public function shouldRejectIfResolverThrowsException()
     public function shouldResolveWithoutCreatingGarbageCyclesIfResolverResolvesWithException()
     {
         gc_collect_cycles();
+        gc_collect_cycles(); // clear twice to avoid leftovers in PHP 7.4 with ext-xdebug and code coverage turned on
+
         $promise = new Promise(function ($resolve) {
             $resolve(new \Exception('foo'));
         });