function testMakePhpOptionsString()
 {
     $tester = new FunctionalTester();
     $this->specify('When default', function () use($tester) {
         $this->assertEquals($tester->makePhpOptionsString(), "");
     });
     $this->specify('When set multiple options', function () use($tester) {
         $tester->setPhpOptions(['display_errors' => 0, 'memory_limit' => 10000]);
         $this->assertEquals($tester->makePhpOptionsString(), "-d display_errors='0' -d memory_limit='10000'");
     });
 }