up the heap size for tests

build.gradle.kts

@@ -29,6 +29,10 @@ subprojects {
     tasks.withType<ProcessResources> {
         filteringCharset = Charsets.UTF_8.name()
     }
+    tasks.withType<Test> {
+        minHeapSize = "2g"
+        maxHeapSize = "2g"
+    }
 
     repositories {
         mavenCentral()