Adding an additional sanity pattern to every test being run

[MarcoMagl]

Context: on the platform I am using I sometimes have some error message that end up in the stderr.
Unfortunately, I am not able to find any pattern/explanation that would help me to understand where those errors are coming from
Ideally, I would like to add a sanity pattern to every test I am doing
What would be a smart way to do this, without having to modify all the RunOnlyRegressionTest instances and so on ?

[vkarak]

You can't have a base sanity function that will be called automatically, since every test has a single sanity function, either inherited or defined in the test. However, you can extend the base sanity function as follows:

@rfm.simple_test
class HelloTest(rfm.RegressionTest, pin_prefix=True):
    descr = 'C Hello World test'

    # All available systems are supported
    valid_systems = ['*']
    valid_prog_environs = ['*']
    sourcepath = 'hello.c'
    tags = {'foo', 'bar'}
    maintainers = ['VK']

    @sanity_function
    def validate(self):
        return sn.assert_found(r'Hello, World\!', self.stdout)


@rfm.simple_test
class DerivedHello(HelloTest):
    @sanity_function
    def validate(self):
        return sn.all([super().validate(), sn.assert_eq(self.job.exitcode, 0)])

You would still have to change all your derived tests though to use this pattern.