We create temporary files a lot, we have to clean it either

utbot-core/src/main/kotlin/org/utbot/common/FileUtil.kt

@@ -64,20 +64,23 @@ object FileUtil {
      * Deletes all the files and folders from the java unit-test temp directory that are older than [daysLimit].
      */
     fun clearTempDirectory(daysLimit: Int) {
-        val currentTimeInMillis = System.currentTimeMillis()
-
-        val files = utBotTempDirectory.toFile().listFiles() ?: return
+        (utBotTempDirectory.toFile().listFiles() ?: return).filter { isOld(it, daysLimit) }
+            .forEach { it.deleteRecursively() }
+    }
 
-        files.filter {
-            val creationTime = Files.readAttributes(it.toPath(), BasicFileAttributes::class.java).creationTime()
-            TimeUnit.MILLISECONDS.toDays(currentTimeInMillis - creationTime.toMillis()) > daysLimit
-        }.forEach { it.deleteRecursively() }
+    private fun isOld(it: File, daysLimit: Int): Boolean {
+        val creationTime = Files.readAttributes(it.toPath(), BasicFileAttributes::class.java).creationTime()
+        return TimeUnit.MILLISECONDS.toDays(System.currentTimeMillis() - creationTime.toMillis()) > daysLimit
     }
 
     fun createTempDirectory(prefix: String): Path {
         return createTempDirectory(utBotTempDirectory, prefix)
     }
 
+    fun createTempFile(prefix: String, suffix: String) : Path {
+        return Files.createTempFile(utBotTempDirectory, prefix, suffix)
+    }
+
     /**
      * Copy the class file for given [classes] to temporary folder.
      * It can be used for Soot analysis.

utbot-framework-api/src/main/kotlin/org/utbot/framework/plugin/api/Api.kt

@@ -40,6 +40,7 @@ import java.io.File
 import java.lang.reflect.Modifier
 import kotlin.contracts.ExperimentalContracts
 import kotlin.contracts.contract
+import org.utbot.common.FileUtil
 
 const val SYMBOLIC_NULL_ADDR: Int = 0
 
@@ -1303,7 +1304,7 @@ enum class CodegenLanguage(
 
 // https://docs.oracle.com/javase/7/docs/technotes/tools/windows/javac.html#commandlineargfile
 fun isolateCommandLineArgumentsToArgumentFile(arguments: List<String>): String {
-    val argumentFile = File.createTempFile("cmd-args", "")
+    val argumentFile = FileUtil.createTempFile("cmd-args", "").toFile()
     argumentFile.writeText(
         arguments.joinToString(" ") {
             // If a filename contains embedded spaces, put the whole filename in double quotes,

utbot-framework/src/main/kotlin/org/utbot/engine/selectors/strategies/GraphViz.kt

@@ -19,6 +19,7 @@ import java.awt.datatransfer.StringSelection
 import java.io.FileWriter
 import java.nio.file.Files
 import java.nio.file.Paths
+import org.utbot.common.FileUtil
 
 private val logger = KotlinLogging.logger {}
 
@@ -29,7 +30,7 @@ class GraphViz(
 ) : TraverseGraphStatistics(globalGraph) {
 
     // Files
-    private val graphVisDirectory = Files.createTempDirectory("Graph-vis")
+    private val graphVisDirectory = FileUtil.createTempDirectory("Graph-vis")
     private val graphVisPathString = graphVisDirectory.toString()
     private val graphJs = Paths.get(graphVisPathString, "graph.js").toFile()