There is no foolproof way to detect if a text was written by artificial intelligence or a human. However, there are some telltale signs that may indicate that the text was produced by a machine. For example, the language may be repetitive or lacking in complexity, and the text may not follow traditional grammar rules. In addition, the text may contain unusual word combinations or phrasing that is not commonly used by humans.

One way to test if a text was written by a machine is to try to identify the "voice" or style of the writing. Machines often have a more robotic or formulaic writing style, while human writing tends to be more varied and nuanced. You can also try reading the text out loud to see if it sounds natural or if it sounds like it was written by a machine.

Another approach is to use tools or services that are specifically designed to detect artificial intelligence-generated text. These tools use machine learning algorithms to analyze the text and provide a score or probability that it was written by a machine. However, it is important to note that these tools are not always accurate, and they may produce false positives or false negatives.