Update test suite to avoid unhandled promise rejections

Author: clue

tests/FunctionRejectTest.php

@@ -58,6 +58,11 @@ public function testWaitingForPromiseToRejectDoesNotLeaveGarbageCycles()
         gc_collect_cycles(); // clear twice to avoid leftovers in PHP 7.4 with ext-xdebug and code coverage turned on
 
         $promise = Timer\reject(0.01);
+
+        $promise->then(null, $this->expectCallableOnce()); // avoid reporting unhandled rejection
+
+        Loop::run();
+
         unset($promise);
 
         $this->assertEquals(0, gc_collect_cycles());

tests/FunctionTimeoutTest.php

@@ -52,7 +52,9 @@ public function testRejectedWillNotStartTimer()
     {
         $promise = Promise\reject(new \Exception('reject'));
 
-        Timer\timeout($promise, 3);
+        $promise = Timer\timeout($promise, 3);
+
+        $promise->then(null, $this->expectCallableOnce()); // avoid reporting unhandled rejection
 
         $time = microtime(true);
         Loop::run();
@@ -83,7 +85,9 @@ public function testPendingCancellableWillBeCancelledThroughFollowerOnTimeout()
         $promise = $this->getMockBuilder($cancellableInterface)->getMock();
         $promise->expects($this->once())->method('then')->willReturn($cancellable);
 
-        Timer\timeout($promise, 0.01);
+        $promise = Timer\timeout($promise, 0.01);
+
+        $promise->then(null, $this->expectCallableOnce()); // avoid reporting unhandled rejection
 
         Loop::run();
     }
@@ -210,6 +214,8 @@ public function testWaitingForPromiseToRejectBeforeTimeoutDoesNotLeaveGarbageCyc
 
         $promise = Timer\timeout($promise, 1.0);
 
+        $promise->then(null, $this->expectCallableOnce()); // avoid reporting unhandled rejection
+
         Loop::run();
         unset($promise);
 
@@ -230,6 +236,8 @@ public function testWaitingForPromiseToTimeoutDoesNotLeaveGarbageCycles()
 
         $promise = Timer\timeout($promise, 0.01);
 
+        $promise->then(null, $this->expectCallableOnce()); // avoid reporting unhandled rejection
+
         Loop::run();
         unset($promise);
 
@@ -248,6 +256,8 @@ public function testWaitingForPromiseToTimeoutWithoutCancellerDoesNotLeaveGarbag
 
         $promise = Timer\timeout($promise, 0.01);
 
+        $promise->then(null, $this->expectCallableOnce()); // avoid reporting unhandled rejection
+
         Loop::run();
         unset($promise);
 
@@ -268,6 +278,8 @@ public function testWaitingForPromiseToTimeoutWithNoOpCancellerDoesNotLeaveGarba
 
         $promise = Timer\timeout($promise, 0.01);
 
+        $promise->then(null, $this->expectCallableOnce()); // avoid reporting unhandled rejection
+
         Loop::run();
         unset($promise);