assertNotNull(result.getProblems());
        assertEquals(0, result.getProblems().size());
    }

    static class TestEnvVarSource implements OperatingSystemUtils.EnvVarSource {
        private final Map<String, String> envVarMap;

        TestEnvVarSource(Map<String, String> envVarMap) {
            this.envVarMap = envVarMap;
        }

        public Map<String, String> getEnvMap() {