Add a regression test for test suites.

Ensure test setup environment variables can from now on be given also as
strings.

run_unittests.py

@@ -813,6 +813,8 @@ class AllPlatformTests(BasePlatformTests):
         self._run(self.mtest_command + ['--setup=empty'])
         # Setup with only env works
         self._run(self.mtest_command + ['--setup=onlyenv'])
+        self._run(self.mtest_command + ['--setup=onlyenv2'])
+        self._run(self.mtest_command + ['--setup=onlyenv3'])
         # Setup with only a timeout works
         self._run(self.mtest_command + ['--setup=timeout'])
 

test cases/unit/2 testsetups/meson.build

@@ -16,5 +16,7 @@ test('Test buggy', buggy)
 
 add_test_setup('empty')
 add_test_setup('onlyenv', env : env)
+add_test_setup('onlyenv2', env : 'TEST_ENV=1')
+add_test_setup('onlyenv3', env : ['TEST_ENV=1'])
 add_test_setup('wrapper', exe_wrapper : [vg, '--error-exitcode=1'])
 add_test_setup('timeout', timeout_multiplier : 20)