Tests cannot contain a ":", and configuring the example produced the
following warning:
test/test_runners/meson.build:12: DEPRECATION: ":" is not allowed in test name "Running: 01-test-case", it has been replaced with "_"
test/test_runners/meson.build:13: DEPRECATION: ":" is not allowed in test name "Running: 02-test-case", it has been replaced with "_"
In this case, the "running" part is redundant, so remove it.