diff --git a/mirai-core/src/androidTest/kotlin/package.kt b/mirai-core/src/androidTest/kotlin/package.kt
new file mode 100644
index 000000000..011261472
--- /dev/null
+++ b/mirai-core/src/androidTest/kotlin/package.kt
@@ -0,0 +1,10 @@
+/*
+ * Copyright 2019-2021 Mamoe Technologies and contributors.
+ *
+ *  此源代码的使用受 GNU AFFERO GENERAL PUBLIC LICENSE version 3 许可证的约束, 可以在以下链接找到该许可证.
+ *  Use of this source code is governed by the GNU AGPLv3 license that can be found through the following link.
+ *
+ *  https://github.com/mamoe/mirai/blob/master/LICENSE
+ */
+
+package net.mamoe.mirai.internal
\ No newline at end of file
diff --git a/mirai-core/src/androidTest/kotlin/test/initPlatform.android.kt b/mirai-core/src/androidTest/kotlin/test/initPlatform.android.kt
new file mode 100644
index 000000000..94ac23a97
--- /dev/null
+++ b/mirai-core/src/androidTest/kotlin/test/initPlatform.android.kt
@@ -0,0 +1,23 @@
+/*
+ * Copyright 2019-2021 Mamoe Technologies and contributors.
+ *
+ *  此源代码的使用受 GNU AFFERO GENERAL PUBLIC LICENSE version 3 许可证的约束, 可以在以下链接找到该许可证.
+ *  Use of this source code is governed by the GNU AGPLv3 license that can be found through the following link.
+ *
+ *  https://github.com/mamoe/mirai/blob/master/LICENSE
+ */
+
+package net.mamoe.mirai.internal.test
+
+import net.mamoe.mirai.utils.MiraiLogger
+
+internal actual fun initPlatform() {
+    init
+}
+
+private val init by lazy {
+    MiraiLogger.setDefaultLoggerCreator {
+        @Suppress("INVISIBLE_MEMBER", "INVISIBLE_REFERENCE")
+        net.mamoe.mirai.internal.utils.StdoutLogger(it)
+    }
+}
\ No newline at end of file
diff --git a/mirai-core/src/commonMain/kotlin/message/LongMessageInternal.kt b/mirai-core/src/commonMain/kotlin/message/LongMessageInternal.kt
index ec78f4f2f..bd1c75802 100644
--- a/mirai-core/src/commonMain/kotlin/message/LongMessageInternal.kt
+++ b/mirai-core/src/commonMain/kotlin/message/LongMessageInternal.kt
@@ -15,7 +15,6 @@ import net.mamoe.mirai.internal.MiraiImpl
 import net.mamoe.mirai.internal.asQQAndroidBot
 import net.mamoe.mirai.internal.network.protocol.data.proto.MsgTransmit
 import net.mamoe.mirai.message.data.*
-import net.mamoe.mirai.utils.cast
 import net.mamoe.mirai.utils.safeCast
 
 // internal runtime value, not serializable
@@ -79,7 +78,7 @@ internal data class ForwardMessageInternal(
                 brief = brief,
                 source = source,
                 summary = summary.trim(),
-                nodeList = Mirai.cast<MiraiImpl>().run { transmits.toForwardMessageNodes(bot, refineContext) }
+                nodeList = MiraiImpl.run { transmits.toForwardMessageNodes(bot, refineContext) }
             )
         }
 
diff --git a/mirai-core/src/commonTest/kotlin/PlatformUtilsTest.kt b/mirai-core/src/commonTest/kotlin/PlatformUtilsTest.kt
index 2723deb08..042bbb61e 100644
--- a/mirai-core/src/commonTest/kotlin/PlatformUtilsTest.kt
+++ b/mirai-core/src/commonTest/kotlin/PlatformUtilsTest.kt
@@ -10,11 +10,12 @@
 package net.mamoe.mirai.internal
 
 import kotlinx.io.core.toByteArray
+import net.mamoe.mirai.internal.test.AbstractTest
 import net.mamoe.mirai.utils.*
 import kotlin.test.Test
 import kotlin.test.assertEquals
 
-internal class PlatformUtilsTest {
+internal class PlatformUtilsTest : AbstractTest() {
 
     @Test
     fun testZip() {
diff --git a/mirai-core/src/commonTest/kotlin/ScheduledJobTest.kt b/mirai-core/src/commonTest/kotlin/ScheduledJobTest.kt
index ce3fb6ad3..dd9113a4b 100644
--- a/mirai-core/src/commonTest/kotlin/ScheduledJobTest.kt
+++ b/mirai-core/src/commonTest/kotlin/ScheduledJobTest.kt
@@ -12,13 +12,14 @@ import kotlinx.coroutines.CoroutineExceptionHandler
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.delay
 import kotlinx.coroutines.runBlocking
+import net.mamoe.mirai.internal.test.AbstractTest
 import net.mamoe.mirai.internal.utils.ScheduledJob
 import org.junit.jupiter.api.Test
 import java.util.concurrent.atomic.AtomicInteger
 import kotlin.test.assertEquals
 import kotlin.time.seconds
 
-internal class ScheduledJobTest {
+internal class ScheduledJobTest : AbstractTest() {
     @Test
     fun testScheduledJob() {
         runBlocking {
diff --git a/mirai-core/src/commonTest/kotlin/TypeConversionTest.kt b/mirai-core/src/commonTest/kotlin/TypeConversionTest.kt
index 0acd104d1..7d2f61f35 100644
--- a/mirai-core/src/commonTest/kotlin/TypeConversionTest.kt
+++ b/mirai-core/src/commonTest/kotlin/TypeConversionTest.kt
@@ -9,6 +9,7 @@
 
 package net.mamoe.mirai.internal
 
+import net.mamoe.mirai.internal.test.AbstractTest
 import net.mamoe.mirai.utils.hexToBytes
 import net.mamoe.mirai.utils.toByteArray
 import net.mamoe.mirai.utils.toUHexString
@@ -16,7 +17,7 @@ import kotlin.test.Test
 import kotlin.test.assertEquals
 import kotlin.test.assertTrue
 
-class TypeConversionTest {
+internal class TypeConversionTest : AbstractTest() {
 
     @ExperimentalUnsignedTypes
     @Test
diff --git a/mirai-core/src/commonTest/kotlin/internal/utils/FileSystemTest.kt b/mirai-core/src/commonTest/kotlin/internal/utils/FileSystemTest.kt
index 69c6c06ff..5defec88a 100644
--- a/mirai-core/src/commonTest/kotlin/internal/utils/FileSystemTest.kt
+++ b/mirai-core/src/commonTest/kotlin/internal/utils/FileSystemTest.kt
@@ -10,11 +10,12 @@
 
 package net.mamoe.mirai.internal.utils
 
+import net.mamoe.mirai.internal.test.AbstractTest
 import org.junit.jupiter.api.Test
 import kotlin.test.assertEquals
 import kotlin.test.assertFailsWith
 
-internal class FileSystemTest {
+internal class FileSystemTest : AbstractTest() {
 
     private val fs = FileSystem
 
diff --git a/mirai-core/src/commonTest/kotlin/message/code/TestMiraiCode.kt b/mirai-core/src/commonTest/kotlin/message/code/TestMiraiCode.kt
index b1f134767..16bd33f5d 100644
--- a/mirai-core/src/commonTest/kotlin/message/code/TestMiraiCode.kt
+++ b/mirai-core/src/commonTest/kotlin/message/code/TestMiraiCode.kt
@@ -11,6 +11,7 @@
 
 package net.mamoe.mirai.internal.message.code
 
+import net.mamoe.mirai.internal.test.AbstractTest
 import net.mamoe.mirai.message.code.MiraiCode.deserializeMiraiCode
 import net.mamoe.mirai.message.code.internal.MiraiCodeParser
 import net.mamoe.mirai.message.data.*
@@ -18,7 +19,7 @@ import org.junit.jupiter.api.Test
 import kotlin.test.assertEquals
 import kotlin.test.assertNotNull
 
-class TestMiraiCode {
+class TestMiraiCode : AbstractTest() {
     @Test
     fun testDynamicMiraiCodeParser() {
         fun runTest(args: Int, code: String, parse: (args: Array<String>) -> Unit) {
diff --git a/mirai-core/src/commonTest/kotlin/test/initPlatform.common.kt b/mirai-core/src/commonTest/kotlin/test/initPlatform.common.kt
new file mode 100644
index 000000000..b487ab37a
--- /dev/null
+++ b/mirai-core/src/commonTest/kotlin/test/initPlatform.common.kt
@@ -0,0 +1,21 @@
+/*
+ * Copyright 2019-2021 Mamoe Technologies and contributors.
+ *
+ *  此源代码的使用受 GNU AFFERO GENERAL PUBLIC LICENSE version 3 许可证的约束, 可以在以下链接找到该许可证.
+ *  Use of this source code is governed by the GNU AGPLv3 license that can be found through the following link.
+ *
+ *  https://github.com/mamoe/mirai/blob/master/LICENSE
+ */
+
+package net.mamoe.mirai.internal.test
+
+internal expect fun initPlatform()
+
+/**
+ * All test classes should inherit from [AbstractTest]
+ */
+abstract class AbstractTest {
+    init {
+        initPlatform()
+    }
+}
\ No newline at end of file
diff --git a/mirai-core/src/jvmTest/kotlin/AbstractTestWithMiraiImpl.kt b/mirai-core/src/jvmTest/kotlin/AbstractTestWithMiraiImpl.kt
index d1b1ded38..805a83203 100644
--- a/mirai-core/src/jvmTest/kotlin/AbstractTestWithMiraiImpl.kt
+++ b/mirai-core/src/jvmTest/kotlin/AbstractTestWithMiraiImpl.kt
@@ -10,11 +10,13 @@
 
 package net.mamoe.mirai.internal
 
+import net.mamoe.mirai.IMirai
 import net.mamoe.mirai.Mirai
+import net.mamoe.mirai.internal.test.AbstractTest
 import org.junit.jupiter.api.AfterEach
 import org.junit.jupiter.api.BeforeEach
 
-internal abstract class AbstractTestWithMiraiImpl : MiraiImpl() {
+internal abstract class AbstractTestWithMiraiImpl : IMirai by MiraiImpl(), AbstractTest() {
     private val originalImpl = Mirai
 
     @BeforeEach
diff --git a/mirai-core/src/jvmTest/kotlin/message/data/MessageRefineTest.kt b/mirai-core/src/jvmTest/kotlin/message/data/MessageRefineTest.kt
index 2b1aadd78..9d037cb27 100644
--- a/mirai-core/src/jvmTest/kotlin/message/data/MessageRefineTest.kt
+++ b/mirai-core/src/jvmTest/kotlin/message/data/MessageRefineTest.kt
@@ -13,7 +13,6 @@ package net.mamoe.mirai.internal.message.data
 import kotlinx.serialization.decodeFromHexString
 import kotlinx.serialization.protobuf.ProtoBuf
 import net.mamoe.mirai.Bot
-import net.mamoe.mirai.Mirai
 import net.mamoe.mirai.internal.AbstractTestWithMiraiImpl
 import net.mamoe.mirai.internal.MiraiImpl
 import net.mamoe.mirai.internal.MockBot
@@ -32,7 +31,6 @@ import net.mamoe.mirai.message.data.*
 import net.mamoe.mirai.message.data.MessageChain.Companion.serializeToJsonString
 import net.mamoe.mirai.utils.PlatformLogger
 import net.mamoe.mirai.utils.autoHexToBytes
-import net.mamoe.mirai.utils.cast
 import org.junit.jupiter.api.Test
 import kotlin.random.Random
 import kotlin.test.assertEquals
@@ -275,7 +273,7 @@ internal class MessageRefineTest : AbstractTestWithMiraiImpl() {
 
     @Test
     fun `test nested forward refinement`() = runBlockingUnit {
-        val redefined = Mirai.cast<MiraiImpl>().run { testCases.nestedForward.toForwardMessageNodes(bot) }
+        val redefined = MiraiImpl.run { testCases.nestedForward.toForwardMessageNodes(bot) }
         assertNodesEquals(
             listOf(
                 ForwardMessage.Node(
diff --git a/mirai-core/src/jvmTest/kotlin/test/initPlatform.kt b/mirai-core/src/jvmTest/kotlin/test/initPlatform.kt
new file mode 100644
index 000000000..2bfae352a
--- /dev/null
+++ b/mirai-core/src/jvmTest/kotlin/test/initPlatform.kt
@@ -0,0 +1,14 @@
+/*
+ * Copyright 2019-2021 Mamoe Technologies and contributors.
+ *
+ *  此源代码的使用受 GNU AFFERO GENERAL PUBLIC LICENSE version 3 许可证的约束, 可以在以下链接找到该许可证.
+ *  Use of this source code is governed by the GNU AGPLv3 license that can be found through the following link.
+ *
+ *  https://github.com/mamoe/mirai/blob/master/LICENSE
+ */
+
+package net.mamoe.mirai.internal.test
+
+internal actual fun initPlatform() {
+    // nothing to do
+}
\ No newline at end of file