fix: Allow falsy values to be passed to addOption and to the command execution (#23)

Author: TristanPouliquen

src/TestCommand.php

@@ -89,7 +89,7 @@ public function addOption(string $name, $value = null): self
         foreach ((array) $value as $item) {
             $this->cli .= " {$name}";
 
-            if ($item) {
+            if (null !== $item) {
                 $this->cli .= \sprintf('="%s"', $item);
             }
         }