[feature] Test mode

src/Medoo.php

@@ -69,7 +69,7 @@ class Medoo
      *
      * @var string
      */
-    protected $type;
+    public $type;
 
     /**
      * Table prefix
@@ -106,6 +106,20 @@ class Medoo
      */
     protected $logging = false;
 
+    /**
+     * Determine is in test mode.
+     *
+     * @var bool
+     */
+    protected $testMode = false;
+
+    /**
+     * The query string last generated in test mode.
+     *
+     * @var string
+     */
+    public $queryString;
+
     /**
      * Determine is in debug mode.
      *
@@ -189,6 +203,11 @@ public function __construct(array $options)
             $this->prefix = $options['prefix'];
         }
 
+        if (isset($options['testMode']) && $options['testMode'] == true) {
+            $this->testMode = true;
+            return;
+        }
+
         if (isset($options['logging']) && is_bool($options['logging'])) {
             $this->logging = $options['logging'];
         }
@@ -471,6 +490,11 @@ public function exec(string $statement, array $map = []) : ?PDOStatement
         $this->errorInfo = null;
         $this->error = null;
 
+        if ($this->testMode) {
+            $this->queryString = $this->generate($statement, $map);
+            return null;
+        }
+
         if ($this->debugMode) {
 
             if ($this->debugLogging) {