Flaky ProcessTest

[som-snytt]

Reproduction steps

Scala version: 2.13.10

sbt.ForkMain$ForkError: org.junit.ComparisonFailure: expected:<[hello, world]> but was:<[]>
	at org.junit.Assert.assertEquals(Assert.java:117)
	at org.junit.Assert.assertEquals(Assert.java:146)
	at test.scala.sys.process.ProcessTest.$anonfun$t10823$7(ProcessTest.scala:97)
	at test.scala.sys.process.ProcessTest.$anonfun$t10823$7$adapted(ProcessTest.scala:97)
	at test.scala.sys.process.ProcessTest.$anonfun$t10823$4(ProcessTest.scala:97)
	at test.scala.sys.process.ProcessTest.$anonfun$t10823$4$adapted(ProcessTest.scala:92)
	at test.scala.sys.process.ProcessTest.$anonfun$t10823$1(ProcessTest.scala:92)
	at test.scala.sys.process.ProcessTest.testily(ProcessTest.scala:24)
	at test.scala.sys.process.ProcessTest.t10823(ProcessTest.scala:92)

Problem

Flaky unit test fails once in a blue moon.