How do I test for an exact Exception message, rather than a substring, with PHPUnit?

Question

According to the PHPUnit Documentation on @expectedExceptionMessage, the string must only be a substring of the actual Exception thrown.

In

Answer 1

You can use $this->expectExceptionMessage to handle this.

Example:

$this->expectException(InvalidArgumentException::class);
$this->expectExceptionMessage = "Some error message";