diff --git a/hideout-core/src/test/kotlin/dev/usbharu/hideout/activitypub/domain/model/JsonLdSerializeTest.kt b/hideout-core/src/test/kotlin/dev/usbharu/hideout/activitypub/domain/model/JsonLdSerializeTest.kt
index 3056cc17..9c9530cc 100644
--- a/hideout-core/src/test/kotlin/dev/usbharu/hideout/activitypub/domain/model/JsonLdSerializeTest.kt
+++ b/hideout-core/src/test/kotlin/dev/usbharu/hideout/activitypub/domain/model/JsonLdSerializeTest.kt
@@ -176,4 +176,74 @@ class JsonLdSerializeTest {
 
         assertEquals("""{"@context":["https://example.com","https://www.w3.org/ns/activitystreams"]}""", actual)
     }
+
+    @Test
+    fun contextがオブジェクトのときシリアライズできる() {
+        val jsonLd = JsonLd(
+            listOf(
+                StringOrObject(mapOf("hoge" to "fuga"))
+            )
+        )
+
+        val objectMapper = ActivityPubConfig().objectMapper()
+
+        val actual = objectMapper.writeValueAsString(jsonLd)
+
+        assertEquals("""{"@context":{"hoge":"fuga"}}""", actual)
+
+    }
+
+    @Test
+    fun contextが複数のオブジェクトのときシリアライズできる() {
+        val jsonLd = JsonLd(
+            listOf(
+                StringOrObject(mapOf("hoge" to "fuga")),
+                StringOrObject(mapOf("foo" to "bar"))
+            )
+        )
+
+        val objectMapper = ActivityPubConfig().objectMapper()
+
+        val actual = objectMapper.writeValueAsString(jsonLd)
+
+        assertEquals("""{"@context":[{"hoge":"fuga"},{"foo":"bar"}]}""", actual)
+    }
+
+    @Test
+    fun contextが複数のオブジェクトのときデシリアライズできる() {
+        //language=JSON
+        val json = """{"@context":["https://example.com",{"hoge": "fuga"},{"foo": "bar"}]}"""
+
+        val objectMapper = ActivityPubConfig().objectMapper()
+
+        val readValue = objectMapper.readValue<JsonLd>(json)
+
+        assertEquals(
+            JsonLd(
+                listOf(
+                    StringOrObject("https://example.com"),
+                    StringOrObject(mapOf("hoge" to "fuga")),
+                    StringOrObject(mapOf("foo" to "bar"))
+                )
+            ), readValue
+        )
+    }
+
+    @Test
+    fun contextがオブジェクトのときデシリアライズできる() {
+        //language=JSON
+        val json = """{"@context":{"hoge": "fuga"}}"""
+
+        val objectMapper = ActivityPubConfig().objectMapper()
+
+        val readValue = objectMapper.readValue<JsonLd>(json)
+
+        assertEquals(
+            JsonLd(
+                listOf(
+                    StringOrObject(mapOf("hoge" to "fuga"))
+                )
+            ), readValue
+        )
+    }
 }