PHPUnit just released version 9.5.10 and 8.5.21.
This contains a particular (IMO breaking) change:
> * PHPUnit no longer converts PHP deprecations to exceptions by default (configure
convertDeprecationsToExceptions="true" to enable this)
Let's unpack this:
Previously (PHPUnit < 9.5.10/8.5.21), if PHPUnit would encounter a PHP native deprecation notice, it would: 1. Show a test which causes a deprecation notice to be thrown as "errored", 2. Show the first deprecation notice it encountered and 3. PHPUnit would exit with a non-0 exit code (2), which will fail a CI build.
As of PHPUnit 9.5.10/8.5.21, if PHPUnit encounters a PHP native deprecation notice, it will no longer do so. Instead PHPUnit will: 1. Show a test which causes a PHP deprecation notice to be thrown as "risky", 2. Show the all deprecation notices it encountered and 3. PHPUnit will exit with a 0 exit code, which will show a CI build as passing.
This commit reverts PHPUnit to the previous behaviour by adding
convertDeprecationsToExceptions="true" to the PHPUnit configuration.