test/refactor: use kotest tempfile() instead of File.createTempFile, can auto-clean after test

Author: oldratlee

library/src/test/java/com/alibaba/dcm/agent/DcmAgentTests.kt

@@ -2,6 +2,7 @@ package com.alibaba.dcm.agent
 
 import com.alibaba.dcm.DnsCacheManipulator
 import io.kotest.core.spec.style.AnnotationSpec
+import io.kotest.engine.spec.tempfile
 import io.kotest.matchers.collections.shouldBeEmpty
 import io.kotest.matchers.collections.shouldContainExactly
 import io.kotest.matchers.nulls.shouldBeNull
@@ -24,7 +25,7 @@ class DcmAgentTests : AnnotationSpec() {
 
     @Before
     fun setUp() {
-        outputFile = File.createTempFile("dcm-output-", ".log")
+        outputFile = tempfile("dcm-output-", ".log")
         outputFile.length() shouldBe 0
         println("Prepared output file: " + outputFile.absolutePath)
 

tool/src/test/java/com/alibaba/dcm/tool/DcmToolTests.kt

@@ -3,6 +3,7 @@ package com.alibaba.dcm.tool
 import io.kotest.assertions.fail
 import io.kotest.core.spec.style.AnnotationSpec
 import io.kotest.core.test.config.TestCaseConfig
+import io.kotest.engine.spec.tempfile
 import io.kotest.matchers.shouldBe
 import org.apache.commons.io.FileUtils
 import org.apache.commons.lang3.SystemUtils
@@ -36,7 +37,7 @@ class DcmToolTests : AnnotationSpec() {
 
     @BeforeEach
     fun setUp() {
-        val outputFile = File.createTempFile("dcm-output-", ".log")
+        val outputFile = tempfile("dcm-output-", ".log")
         outputFile.length() shouldBe 0
 
         val outputFilePath = outputFile.canonicalPath