diff --git a/core/src/test/kotlin/dev/usbharu/multim/TestUtil.kt b/core/src/test/kotlin/dev/usbharu/multim/TestUtil.kt
index 95fad93..65cf419 100644
--- a/core/src/test/kotlin/dev/usbharu/multim/TestUtil.kt
+++ b/core/src/test/kotlin/dev/usbharu/multim/TestUtil.kt
@@ -61,7 +61,7 @@ object TestUtil {
     ): suspend MockRequestHandleScope.(HttpRequestData) -> HttpResponseData {
         return { httpRequestData: HttpRequestData ->
             val decodeToString = httpRequestData.body.toByteArray().decodeToString()
-            println(decodeToString)
+            Logger.debug(decodeToString)
             if ("i" in json.parseToJsonElement(decodeToString).jsonObject) {
                 respond(respond, status, headers)
             } else {
diff --git a/core/src/test/kotlin/dev/usbharu/multim/api/NodeInfoTest.kt b/core/src/test/kotlin/dev/usbharu/multim/api/NodeInfoTest.kt
index 405761c..31333cb 100644
--- a/core/src/test/kotlin/dev/usbharu/multim/api/NodeInfoTest.kt
+++ b/core/src/test/kotlin/dev/usbharu/multim/api/NodeInfoTest.kt
@@ -1,14 +1,18 @@
 package dev.usbharu.multim.api
 
+import dev.usbharu.multim.Logger
+import dev.usbharu.multim.TestUtil.failOnError
 import io.ktor.client.*
 import io.ktor.client.engine.cio.*
 import io.ktor.client.plugins.contentnegotiation.*
 import io.ktor.serialization.kotlinx.json.*
+import kotlinx.coroutines.ExperimentalCoroutinesApi
 import kotlinx.coroutines.test.runTest
 import kotlinx.serialization.json.Json
 import org.junit.jupiter.api.Test
 
 class NodeInfoE2E {
+    @OptIn(ExperimentalCoroutinesApi::class)
     @Test
     fun nodeinfo() = runTest {
         val nodeinfo = NodeinfoApi(HttpClient(CIO).config {
@@ -18,7 +22,7 @@ class NodeInfoE2E {
                     isLenient = true
                 })
             }
-        }).nodeinfo(System.getProperty("multim_misskey_instance"))
-        println(nodeinfo)
+        }).nodeinfo(System.getProperty("multim_misskey_instance")).failOnError()
+        Logger.debug(nodeinfo.toString())
     }
 }
diff --git a/impl/misskey/src/main/kotlin/dev/usbharu/multim/misskey/v12/common/api/MisskeyApiClient.kt b/impl/misskey/src/main/kotlin/dev/usbharu/multim/misskey/v12/common/api/MisskeyApiClient.kt
index 9d4e7b5..6eb0edd 100644
--- a/impl/misskey/src/main/kotlin/dev/usbharu/multim/misskey/v12/common/api/MisskeyApiClient.kt
+++ b/impl/misskey/src/main/kotlin/dev/usbharu/multim/misskey/v12/common/api/MisskeyApiClient.kt
@@ -1,5 +1,6 @@
 package dev.usbharu.multim.misskey.v12.common.api
 
+import dev.usbharu.multim.Logger
 import dev.usbharu.multim.MultiM.json
 import dev.usbharu.multim.api.ApiClient
 import dev.usbharu.multim.misskey.v12.model.components.MisskeyNeedAuth
@@ -27,9 +28,9 @@ class MisskeyApiClient(var auth: SingleTokenAuth, baseUrl: String, client: HttpC
         }
         install(createClientPlugin("MisskeyAuthPlugin") {
             onRequest { request, content ->
-                println("request type is :${content::class}")
+                Logger.trace("Misskey Auth Plugin","request type is :${content::class}")
                 if (content is MisskeyNeedAuth) {
-                    println("injection token")
+                    Logger.trace("Misskey Auth Plugin","Injection token")
                     content.i = auth.token
                 }
                 request.headers.append(
@@ -54,7 +55,7 @@ class MisskeyApiClient(var auth: SingleTokenAuth, baseUrl: String, client: HttpC
                 client.wss("ws" + baseUrl.replaceFirst("http", "") + "streaming?i=${auth.token}") {
                     awaitAll(
                         coroutineScope.async {
-                            commands.onEach { println("Sending :$it");outgoing.send(Frame.Text(it)) }
+                            commands.onEach { Logger.debug("Api Client Streaming","Sending :$it");outgoing.send(Frame.Text(it)) }
                                 .launchIn(coroutineScope)
                         },
                         coroutineScope.async {
@@ -68,7 +69,7 @@ class MisskeyApiClient(var auth: SingleTokenAuth, baseUrl: String, client: HttpC
                         }
                     )
                 }
-                println("connected")
+                Logger.debug("Api Client Streaming","Connected")
 
             }
 //            launch.join()
diff --git a/impl/misskey/src/test/kotlin/MisskeyTestUtil.kt b/impl/misskey/src/test/kotlin/MisskeyTestUtil.kt
index f0e836a..317a7bc 100644
--- a/impl/misskey/src/test/kotlin/MisskeyTestUtil.kt
+++ b/impl/misskey/src/test/kotlin/MisskeyTestUtil.kt
@@ -59,7 +59,6 @@ object MisskeyTestUtil {
     ): suspend MockRequestHandleScope.(HttpRequestData) -> HttpResponseData {
         return { httpRequestData: HttpRequestData ->
             val decodeToString = httpRequestData.body.toByteArray().decodeToString()
-            println(decodeToString)
             if ("i" in json.parseToJsonElement(decodeToString).jsonObject) {
                 respond(respond, status, headers)
             } else {
diff --git a/impl/misskey/src/test/kotlin/dev/usbharu/multim/misskey/v12/api/MetaTest.kt b/impl/misskey/src/test/kotlin/dev/usbharu/multim/misskey/v12/api/MetaTest.kt
index 94eb826..3070c37 100644
--- a/impl/misskey/src/test/kotlin/dev/usbharu/multim/misskey/v12/api/MetaTest.kt
+++ b/impl/misskey/src/test/kotlin/dev/usbharu/multim/misskey/v12/api/MetaTest.kt
@@ -24,6 +24,5 @@ class MetaTestE2E {
     @Test
     fun meta() = runTest {
         val meta = Meta(misskeyApiClient).meta(MetaRequest()).failOnError()
-        println(meta)
     }
 }
diff --git a/impl/misskey/src/test/kotlin/dev/usbharu/multim/misskey/v12/api/NotesTest.kt b/impl/misskey/src/test/kotlin/dev/usbharu/multim/misskey/v12/api/NotesTest.kt
index 6f48ead..9e689d6 100644
--- a/impl/misskey/src/test/kotlin/dev/usbharu/multim/misskey/v12/api/NotesTest.kt
+++ b/impl/misskey/src/test/kotlin/dev/usbharu/multim/misskey/v12/api/NotesTest.kt
@@ -117,8 +117,7 @@ class NotesTest {
 
     @Test
     fun ldttest() {
-        val parse = Instant.parse("2023-01-17T06:58:08.000Z")
-        println(parse)
+        Instant.parse("2023-01-17T06:58:08.000Z")
     }
 
 
@@ -198,20 +197,17 @@ class NotesTestE2E {
 
     @Test
     fun globalTimeline() = runTest {
-        val globalTimeline = notes.globalTimeline(NotesGlobalTimelineRequest()).failOnError()
-        println(globalTimeline)
+        notes.globalTimeline(NotesGlobalTimelineRequest()).failOnError()
     }
 
     @Test
     fun hybridTimeline() = runTest {
-        val hybridTimeline = notes.hybridTimeline(NotesHybridTimelineRequest()).failOnError()
-        println(hybridTimeline)
+        notes.hybridTimeline(NotesHybridTimelineRequest()).failOnError()
     }
 
     @Test
     fun localTimeline() = runTest {
-        val localTimeline = notes.localTimeline(NotesLocalTimelineRequest()).failOnError()
-        println(localTimeline)
+        notes.localTimeline(NotesLocalTimelineRequest()).failOnError()
     }
 
     @Test
@@ -219,18 +215,17 @@ class NotesTestE2E {
         val show =
             notes.show(NotesShowRequest(notes.notes(NotesNotesRequest()).failOnError().first().id))
                 .failOnError()
-        println(show)
+
     }
 
     @Test
     fun create() = runTest {
-        val created = notes.create(
+        notes.create(
             NotesCreateRequest(
                 visibility = NotesCreateRequest.Visibility.HOME,
                 text = "このノートはMultim のテストで作成されました。${this@NotesTestE2E::class} create Test"
             )
         ).failOnError()
-        println(created.createdNote)
     }
 
     @Test
@@ -283,8 +278,7 @@ class NotesTestE2E {
 
     @Test
     fun featured() = runTest {
-        val featured = notes.featured().failOnError()
-        println(featured)
+        notes.featured().failOnError()
     }
 
     @Test
@@ -293,7 +287,6 @@ class NotesTestE2E {
             notes.create(NotesCreateRequest(text = "このノートはMultiMのテストで作成され、子ノート取得のテストで使用されます。${this@NotesTestE2E::class} children"))
         val id = create.failOnError().createdNote.id
         val children = notes.children(NotesChildrenRequest(id)).failOnError()
-        println(children)
     }
 
     @Test
@@ -303,14 +296,12 @@ class NotesTestE2E {
                 .failOnError()
         val conversation =
             notes.conversation(NotesConversationRequest(create.createdNote.id)).failOnError()
-        println(conversation)
     }
 
     @Test
     fun state() = runTest {
         val create = notes.create(NotesCreateRequest(text="このノートはMultiMのテストで作成され、ノートの状態を取得するテストで使用されます。 ${this@NotesTestE2E::class} state")).failOnError()
         val state = notes.state(NotesStateRequest(create.createdNote.id)).failOnError()
-        println(state)
     }
 
     @Test
@@ -346,14 +337,12 @@ class NotesTestE2E {
     @Test
     fun mentions() = runTest {
         val mentions = notes.mentions(NotesMentionsRequest()).failOnError()
-        println(mentions)
     }
 
     @Test
     fun reactions() = runTest {
         val create = notes.create(NotesCreateRequest(text = "このノートはMultiMのテストで作成され、リアクション取得のテストで使用されます。 ${this@NotesTestE2E::class} reactions")).failOnError()
         val reactions = notes.reactions(NotesReactionsRequest(create.createdNote.id))
-        println(reactions)
     }
 
     @Test
@@ -366,7 +355,6 @@ class NotesTestE2E {
         val renotes = NotesRenoteRequest(create.createdNote.id)
             .let { notes.renotes(it) }.failOnError()
         assertEquals(listOf(notesCreateResponse.createdNote), renotes)
-        println(renotes)
     }
 
     @Test
@@ -402,7 +390,6 @@ class NotesTestE2E {
         val searchByTag = notes.searchByTag(NotesSearchByTagRequest(tag)).failOnError()
         org.assertj.core.api.Assertions.assertThat(searchByTag)?.isNotEmpty
         assertTrue(searchByTag.contains(tagedNote.createdNote))
-        println(searchByTag)
     }
 
     @Test
@@ -443,7 +430,6 @@ class NotesTestE2E {
     @Test
     fun timeline() = runTest {
         val timeline = notes.timeline(NotesTimelineRequest()).failOnError()
-        println(timeline)
     }
 
     @RepeatedIfExceptionsTest(repeats = 4)
@@ -470,10 +456,7 @@ class NotesTestE2E {
     @Disabled("リスト操作系のAPIが未実装なため無効化")
     // TODO: リスト操作系のAPI追加後、リストを取得してテストするように
     fun userListTimeline() = runTest {
-
         val userListTimeline = notes.userListTimeline(NotesUserListTimelineRequest("9ady10e6z5"))
-        println(userListTimeline)
-
     }
 
     @Test
diff --git a/impl/misskey/src/test/kotlin/dev/usbharu/multim/misskey/v12/common/api/MisskeyStatusApiTest.kt b/impl/misskey/src/test/kotlin/dev/usbharu/multim/misskey/v12/common/api/MisskeyStatusApiTest.kt
index a66515a..92e9df7 100644
--- a/impl/misskey/src/test/kotlin/dev/usbharu/multim/misskey/v12/common/api/MisskeyStatusApiTest.kt
+++ b/impl/misskey/src/test/kotlin/dev/usbharu/multim/misskey/v12/common/api/MisskeyStatusApiTest.kt
@@ -2,6 +2,7 @@ package dev.usbharu.multim.misskey.v12.common.api
 
 import MisskeyTestUtil
 import com.github.michaelbull.result.get
+import dev.usbharu.multim.TestUtil.failOnError
 import dev.usbharu.multim.misskey.v12.api.MisskeyApis
 import dev.usbharu.multim.misskey.v12.common.MisskeyStatusId
 import dev.usbharu.multim.model.SingleTokenAuth
@@ -52,7 +53,7 @@ class MisskeyStatusApiTest {
     @Test
     fun findByIdTest() = runTest {
         val findById =
-            misskeyStatusApi.findById(MisskeyStatusId("9a65528e5z", "https://lcalhost")).get()
-        println(findById?.content?.text)
+            misskeyStatusApi.findById(MisskeyStatusId("9a65528e5z", "https://lcalhost")).failOnError()
+
     }
 }