Check for the number of failed attempts instead of the content of the...

Check for the number of failed attempts instead of the content of the exception message, as the message can be quite different between PHP versions and HHVM.

tests/Unit/Commands/CommandTest.php

@@ -65,25 +65,30 @@ class CommandTest extends TestCase
         $this->command_stub_with_config->__construct($this->telegram_with_config);
     }
 
+    // Test idea from here: http://stackoverflow.com/a/4371606
     public function testCommandConstructorNeedsTelegramObject()
     {
-        $error_message = 'must be an instance of Longman\TelegramBot\Telegram';
+        $exception_count = 0;
         $params_to_test = [
             [],
             [null],
+            [12345],
             ['something'],
             [new \stdClass],
+            [$this->telegram], // only this one is valid
         ];
 
         foreach ($params_to_test as $param) {
             try {
                 $this->getMockForAbstractClass($this->command_namespace, $param);
             } catch (\Exception $e) {
-                $this->assertContains($error_message, $e->getMessage());
+                $exception_count++;
             } catch (\Throwable $e) { //For PHP7
-                $this->assertContains($error_message, $e->getMessage());
+                $exception_count++;
             }
         }
+
+        $this->assertEquals(5, $exception_count);
     }
 
     public function testCommandHasCorrectTelegramObject()