I created new play application (activator new tcc3 play-java) and imported it into IntelliJ IDEA.
Then I ran it using new SBT task (according to documentation).
Compilation completed with 11 errors and 1 warning:
D:\Projects\tcc3\test\IntegrationTest.java
Error:(1, 1) java: package org.junit does not exist
Error:(8, 24) java: package org.junit does not exist
Error:(18, 6) java: cannot find symbol
symbol: class Test
location: class IntegrationTest
Error:(23, 17) java: cannot find symbol
symbol: method assertTrue(boolean)
D:\Projects\tcc3\test\ApplicationTest.java
..."junit" % "junit" % "4.12" % "test"