diff --git a/build.gradle.kts b/build.gradle.kts
index c8d31ca7..4ecf8a33 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -217,6 +217,7 @@ dependencies {
     testImplementation("org.mockito:mockito-inline:5.2.0")
     testImplementation("nl.jqno.equalsverifier:equalsverifier:3.15.3")
     testImplementation("com.jparams:to-string-verifier:1.4.8")
+    testImplementation("com.toomuchcoding.jsonassert:jsonassert:0.7.0")
 
     implementation("org.drewcarlson:kjob-core:0.6.0")
     implementation("org.drewcarlson:kjob-mongo:0.6.0")
diff --git a/src/test/kotlin/dev/usbharu/hideout/activitypub/domain/model/BlockTest.kt b/src/test/kotlin/dev/usbharu/hideout/activitypub/domain/model/BlockTest.kt
new file mode 100644
index 00000000..d7e2f700
--- /dev/null
+++ b/src/test/kotlin/dev/usbharu/hideout/activitypub/domain/model/BlockTest.kt
@@ -0,0 +1,77 @@
+package dev.usbharu.hideout.activitypub.domain.model
+
+import com.fasterxml.jackson.module.kotlin.readValue
+import dev.usbharu.hideout.application.config.ActivityPubConfig
+import org.assertj.core.api.Assertions.assertThat
+import org.intellij.lang.annotations.Language
+import org.junit.jupiter.api.Test
+import org.springframework.boot.test.json.BasicJsonTester
+
+class BlockTest {
+    @Test
+    fun blockDeserializeTest() {
+        @Language("JSON") val json = """{
+  "@context" : [ "https://www.w3.org/ns/activitystreams", "https://w3id.org/security/v1", {
+    "manuallyApprovesFollowers" : "as:manuallyApprovesFollowers",
+    "sensitive" : "as:sensitive",
+    "Hashtag" : "as:Hashtag",
+    "quoteUrl" : "as:quoteUrl",
+    "toot" : "http://joinmastodon.org/ns#",
+    "Emoji" : "toot:Emoji",
+    "featured" : "toot:featured",
+    "discoverable" : "toot:discoverable",
+    "schema" : "http://schema.org#",
+    "PropertyValue" : "schema:PropertyValue",
+    "value" : "schema:value",
+    "misskey" : "https://misskey-hub.net/ns#",
+    "_misskey_content" : "misskey:_misskey_content",
+    "_misskey_quote" : "misskey:_misskey_quote",
+    "_misskey_reaction" : "misskey:_misskey_reaction",
+    "_misskey_votes" : "misskey:_misskey_votes",
+    "_misskey_summary" : "misskey:_misskey_summary",
+    "isCat" : "misskey:isCat",
+    "vcard" : "http://www.w3.org/2006/vcard/ns#"
+  } ],
+  "type" : "Block",
+  "id" : "https://misskey.usbharu.dev/blocks/9myf6e40vm",
+  "actor" : "https://misskey.usbharu.dev/users/97ws8y3rj6",
+  "object" : "https://test-hideout.usbharu.dev/users/test-user2"
+}
+"""
+
+        val objectMapper = ActivityPubConfig().objectMapper()
+
+        val block = objectMapper.readValue<Block>(json)
+
+        val expected = Block(
+            "https://misskey.usbharu.dev/users/97ws8y3rj6",
+            "https://misskey.usbharu.dev/blocks/9myf6e40vm",
+            "https://test-hideout.usbharu.dev/users/test-user2"
+        ).apply { context = listOf("https://www.w3.org/ns/activitystreams", "https://w3id.org/security/v1") }
+        assertThat(block).isEqualTo(expected)
+    }
+
+    @Test
+    fun blockSerializeTest() {
+        val basicJsonTester = BasicJsonTester(javaClass)
+
+        val block = Block(
+            "https://misskey.usbharu.dev/users/97ws8y3rj6",
+            "https://misskey.usbharu.dev/blocks/9myf6e40vm",
+            "https://test-hideout.usbharu.dev/users/test-user2"
+        ).apply { context = listOf("https://www.w3.org/ns/activitystreams", "https://w3id.org/security/v1") }
+
+        val objectMapper = ActivityPubConfig().objectMapper()
+
+        val writeValueAsString = objectMapper.writeValueAsString(block)
+
+        val from = basicJsonTester.from(writeValueAsString)
+        assertThat(from).extractingJsonPathStringValue("$.actor")
+            .isEqualTo("https://misskey.usbharu.dev/users/97ws8y3rj6")
+        assertThat(from).extractingJsonPathStringValue("$.id")
+            .isEqualTo("https://misskey.usbharu.dev/blocks/9myf6e40vm")
+        assertThat(from).extractingJsonPathStringValue("$.object")
+            .isEqualTo("https://test-hideout.usbharu.dev/users/test-user2")
+
+    }
+}