diff --git a/.travis.yml b/.travis.yml
index bd2ae443..ddac7a86 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,6 +4,7 @@ php:
   - 7.1
   - 7.2
   - 7.3
+  - 7.4
   - nightly # ignore errors, see below
 
 # lock distro so new future defaults will not break the build
@@ -17,6 +18,7 @@ install:
   - composer install
 
 script:
+  - ./vendor/bin/phpunit -v
   - ./vendor/bin/phpunit -v --coverage-text --coverage-clover=./build/logs/clover.xml
 
 after_script:
diff --git a/tests/DeferredTest.php b/tests/DeferredTest.php
index 172cb246..861dd576 100644
--- a/tests/DeferredTest.php
+++ b/tests/DeferredTest.php
@@ -23,6 +23,10 @@ public function getPromiseTestAdapter(callable $canceller = null)
     /** @test */
     public function shouldRejectWithoutCreatingGarbageCyclesIfCancellerRejectsWithException()
     {
+        if ($this->getTestResultObject()->getCollectCodeCoverageInformation() === true) {
+            $this->markTestSkipped('This test has memory leaks when code coverage is collected');
+        }
+
         gc_collect_cycles();
         $deferred = new Deferred(function ($resolve, $reject) {
             $reject(new \Exception('foo'));
@@ -36,6 +40,10 @@ public function shouldRejectWithoutCreatingGarbageCyclesIfCancellerRejectsWithEx
     /** @test */
     public function shouldRejectWithoutCreatingGarbageCyclesIfParentCancellerRejectsWithException()
     {
+        if ($this->getTestResultObject()->getCollectCodeCoverageInformation() === true) {
+            $this->markTestSkipped('This test has memory leaks when code coverage is collected');
+        }
+
         gc_collect_cycles();
         $deferred = new Deferred(function ($resolve, $reject) {
             $reject(new \Exception('foo'));
@@ -49,6 +57,10 @@ public function shouldRejectWithoutCreatingGarbageCyclesIfParentCancellerRejects
     /** @test */
     public function shouldRejectWithoutCreatingGarbageCyclesIfCancellerHoldsReferenceAndExplicitlyRejectWithException()
     {
+        if ($this->getTestResultObject()->getCollectCodeCoverageInformation() === true) {
+            $this->markTestSkipped('This test has memory leaks when code coverage is collected');
+        }
+
         gc_collect_cycles();
         $deferred = new Deferred(function () use (&$deferred) { });
         $deferred->reject(new \Exception('foo'));