Framework tests fail because of KOTLIN_HOME absence

[denis-fokin]

Description

Sometimes new users cannot run framework tests successfully (see the visual proof section). It happens because of absence of KOTLIN_HOME variable. We rely on this variable in our code in order to check that generated tests are compilable.

To Reproduce

In order to reproduce the problem, clear the KOTLIN_HOME variable value or remove the environment variable.

Expected behavior

Print a message in the test output and signal the user that the KOTLIN_HOME variable must be specified.

Actual behavior

An exception message from the ProcessBuilder class

Visual proofs (screenshots, logs, images)

Environment

Run org.utbot.examples.algorithms.SortTest

Additional context

No additional context.