Increase heap memory for ‘gradle test’

You can use the maxHeapSize configuration of the Test task.

Example in Gradle/Groovy:

test {
  minHeapSize = "128m" // initial heap size
  maxHeapSize = "512m" // maximum heap size
  jvmArgs '-XX:MaxPermSize=256m' // mem argument for the test JVM
}

Or the same in Kotlin:

withType<Test> {
  minHeapSize = "512m"
  maxHeapSize = "1024m"
  jvmArgs = listOf("-XX:MaxPermSize=512m")
}

Check out the official docs for additional info.