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# Check that we do not crash if a parallelism group is set to None. Permits
# usage of the following pattern.
#
# [lit.common.cfg]
# lit_config.parallelism_groups['my_group'] = None
# if <condition>:
# lit_config.parallelism_groups['my_group'] = 3
#
# [project/lit.cfg]
# config.parallelism_group = 'my_group'
#
# Note: We need at least 2 tests to prevent lit from using "single process
# mode", which ignores parallelism groups.
#
# RUN: %{lit} -j2 %{inputs}/parallelism-groups | FileCheck %s
# CHECK: -- Testing: 2 tests, 2 threads --
# CHECK-DAG: PASS: parallelism-groups :: test1.txt
# CHECK-DAG: PASS: parallelism-groups :: test2.txt
# CHECK: Expected Passes : 2
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