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It’s not built into Spek itself (we haven’t discussed that), for the JVM Spek uses JUnit5 as underlying execution Engine and we properly discover and execute tests through JUnit5 `TestEngine` api 

So, if JUnit5 can set up JUnit5 to run tests in parallel, this should make Spek parallel

My concern is that inside particular Spek we’re not expecting concurrent execution, but separate Speks should allow parallel execution without much problems