diff --git a/mirai-core/src/jvmTest/kotlin/net/mamoe/mirai/contact/GroupIdConversionsKtTest.kt b/mirai-core/src/jvmTest/kotlin/net/mamoe/mirai/contact/GroupIdConversionsKtTest.kt
index 505b6e282..204d62e61 100644
--- a/mirai-core/src/jvmTest/kotlin/net/mamoe/mirai/contact/GroupIdConversionsKtTest.kt
+++ b/mirai-core/src/jvmTest/kotlin/net/mamoe/mirai/contact/GroupIdConversionsKtTest.kt
@@ -6,142 +6,10 @@ import kotlin.random.Random
 
 @UseExperimental(ExperimentalUnsignedTypes::class)
 internal class GroupIdConversionsKtTest {
-
     @Test
     fun checkToInternalId() {
         GroupId(221056495u).toInternalId().value shouldBeEqualTo 4111056495u
         //  61 056495
         //4111 056495
     }
-
-
-    @Test
-    fun toInternalId() {
-        repeat(1000000) { _ ->
-            val it = Random.nextInt()
-            try {
-                GroupId(it.toUInt()).toInternalId() shouldBeEqualTo GroupId(it.toUInt()).toInternalIdOld()
-            } catch (e: Throwable) {
-                println(it)
-                throw e
-            }
-        }
-    }
-
-    @UseExperimental(ExperimentalUnsignedTypes::class)
-    @Test
-    fun toId() {
-        repeat(1000000) { _ ->
-            val it = Random.nextInt()
-            try {
-                GroupInternalId(it.toUInt()).toId() shouldBeEqualTo GroupInternalId(it.toUInt()).toIdOld()
-            } catch (e: Throwable) {
-                println(it)
-                throw e
-            }
-        }
-    }
-
-
-}
-
-@UseExperimental(ExperimentalUnsignedTypes::class)
-private fun GroupId.toInternalIdOld(): GroupInternalId {//求你别出错
-    val left: Long = this.value.toString().let {
-        if (it.length <= 6) {
-            return GroupInternalId(this.value)
-        }
-        it.substring(0, it.length - 6).toLong()
-    }
-    val right: Long = this.value.toString().let {
-        it.substring(it.length - 6).toLong()
-    }
-
-    return GroupInternalId(
-        when (left) {
-            in 1..10 -> {
-                ((left + 202).toString() + right.toString()).toUInt()
-            }
-            in 11..19 -> {
-                ((left + 469).toString() + right.toString()).toUInt()
-            }
-            in 20..66 -> {
-                ((left + 208).toString() + right.toString()).toUInt()
-            }
-            in 67..156 -> {
-                ((left + 1943).toString() + right.toString()).toUInt()
-            }
-            in 157..209 -> {
-                ((left + 199).toString() + right.toString()).toUInt()
-            }
-            in 210..309 -> {
-                ((left + 389).toString() + right.toString()).toUInt()
-            }
-            in 310..499 -> {
-                ((left + 349).toString() + right.toString()).toUInt()
-            }
-            else -> this.value
-        }
-    )
-}
-
-@UseExperimental(ExperimentalUnsignedTypes::class)
-private fun GroupInternalId.toIdOld(): GroupId = with(value) {
-    //求你别出错
-    var left: UInt = this.toString().let {
-        if (it.length <= 6) {
-            return GroupId(value)
-        }
-        it.substring(0 until it.length - 6).toUInt()
-    }
-
-    return GroupId(when (left.toInt()) {
-        in 203..212 -> {
-            val right: UInt = this.toString().let {
-                it.substring(it.length - 6).toUInt()
-            }
-            ((left - 202u).toString() + right.toString()).toUInt()
-        }
-        in 480..488 -> {
-            val right: UInt = this.toString().let {
-                it.substring(it.length - 6).toUInt()
-            }
-            ((left - 469u).toString() + right.toString()).toUInt()
-        }
-        in 2100..2146 -> {
-            val right: UInt = this.toString().let {
-                it.substring(it.length - 7).toUInt()
-            }
-            left = left.toString().substring(0 until 3).toUInt()
-            ((left - 208u).toString() + right.toString()).toUInt()
-        }
-        in 2010..2099 -> {
-            val right: UInt = this.toString().let {
-                it.substring(it.length - 6).toUInt()
-            }
-            ((left - 1943u).toString() + right.toString()).toUInt()
-        }
-        in 2147..2199 -> {
-            val right: UInt = this.toString().let {
-                it.substring(it.length - 7).toUInt()
-            }
-            left = left.toString().substring(0 until 3).toUInt()
-            ((left - 199u).toString() + right.toString()).toUInt()
-        }
-        in 4100..4199 -> {
-            val right: UInt = this.toString().let {
-                it.substring(it.length - 7).toUInt()
-            }
-            left = left.toString().substring(0 until 3).toUInt()
-            ((left - 389u).toString() + right.toString()).toUInt()
-        }
-        in 3800..3989 -> {
-            val right: UInt = this.toString().let {
-                it.substring(it.length - 7).toUInt()
-            }
-            left = left.toString().substring(0 until 3).toUInt()
-            ((left - 349u).toString() + right.toString()).toUInt()
-        }
-        else -> value
-    })
 }
\ No newline at end of file