@@ -64,6 +64,16 @@ protected function tearDown(): void
 putenv('SHELL_VERBOSITY');
 unset($_ENV['SHELL_VERBOSITY']);
 unset($_SERVER['SHELL_VERBOSITY']);
+
+if (\function_exists('pcntl_signal')) {
+// We reset all signals to their default value to avoid side effects
+for ($i = 1; $i <= 15; ++$i) {
+if (9 === $i) {
+continue;
+}
+pcntl_signal($i, SIG_DFL);
+}
+}
 }
 
 public static function setUpBeforeClass(): void
@@ -508,15 +518,7 @@ public function testDontRunAlternativeNamespaceName()
 $application->setAutoExit(false);
 $tester = new ApplicationTester($application);
 $tester->run(['command' => 'foos:bar1'], ['decorated' => false]);
-$this->assertSame('
-
-There are no commands defined in the "foos" namespace.
-
-Did you mean this?
-foo
-
-
-', $tester->getDisplay(true));
+$this->assertStringEqualsFile(self::$fixturesPath.'/application.dont_run_alternative_namespace_name.txt', $tester->getDisplay(true));
 }
 
 public function testCanRunAlternativeCommandName()
@@ -1956,15 +1958,38 @@ public function testSetSignalsToDisEvent()
 $diser = new EventDiser();
 $diser->addSubscriber($subscriber);
 
+// Since there is no signal handler, and by default PHP will stop even
+// on SIGUSR1, we need to register a blank handler to avoid the process
+// being stopped.
+$blankHandlerSignaled = false;
+pcntl_signal(\SIGUSR1, function () use (&$blankHandlerSignaled) {
+$blankHandlerSignaled = true;
+});
+
 $application = $this->createSignalableApplication($command, $diser);
 $application->setSignalsToDisEvent(\SIGUSR2);
 $this->assertSame(0, $application->run(new ArrayInput(['signal'])));
 $this->assertFalse($subscriber->signaled);
+$this->assertTrue($blankHandlerSignaled);
+
+// We reset the blank handler to false to make sure it is called again
+$blankHandlerSignaled = false;
+
+$application = $this->createSignalableApplication($command, $diser);
+$application->setSignalsToDisEvent(\SIGUSR1);
+$this->assertSame(1, $application->run(new ArrayInput(['signal'])));
+$this->assertTrue($subscriber->signaled);
+$this->assertTrue($blankHandlerSignaled);
+
+// And now we test without the blank handler
+$blankHandlerSignaled = false;
+pcntl_signal(\SIGUSR1, SIG_DFL);
 
 $application = $this->createSignalableApplication($command, $diser);
 $application->setSignalsToDisEvent(\SIGUSR1);
 $this->assertSame(1, $application->run(new ArrayInput(['signal'])));
 $this->assertTrue($subscriber->signaled);
+$this->assertFalse($blankHandlerSignaled);
 }
 
 public function testSignalableCommandInterfaceWithoutSignals()

@@ -0,0 +1,8 @@
+
+
+There are no commands defined in the "foos" namespace.
+
+Did you mean this?
+foo
+
+