Unity - Scripting API:

public static function Assert(condition: bool): void;

public static void Assert(bool condition);

public static function Assert(condition: bool, context: Object): void;

public static void Assert(bool condition, Object context);

public static function Assert(condition: bool, message: object): void;

public static void Assert(bool condition, object message);

public static function Assert(condition: bool, message: object, context: Object): void;

public static void Assert(bool condition, object message, Object context);

Parameters

condition	Condition you expect to be true.
context	Object to which the message applies.
message	String or object to be converted to string representation for display.

Assert a condition and logs a formatted error message to the Unity console on failure.

Message of a type of LogType.Assert is logged.