test: user-inboxの認証テストを追加

src/e2eTest/kotlin/federation/InboxCommonTest.kt

@@ -67,6 +67,16 @@ class InboxCommonTest {
         )
     }
 
+    @Karate.Test
+    @TestFactory
+    fun `user-inboxにHTTP Signatureがないリクエストがきたら401を返す`(): Karate {
+        return KarateUtil.e2eTest(
+            "InboxCommonTest",
+            "user-inboxにHTTP Signatureがないリクエストがきたら401を返す",
+            mapOf("karate.port" to port),
+            javaClass
+        )
+    }
 
     companion object {
         lateinit var server: MockServer

src/e2eTest/resources/federation/InboxCommonTest.feature

@@ -91,3 +91,15 @@ Feature: Inbox Common Test
 
     * print response
     Then match response.req == ['/users/test-user2']
+
+  Scenario: user-inboxにHTTP Signatureがないリクエストがきたら401を返す
+
+    * def inbox =
+    """
+    {"type": "Follow"}
+    """
+
+    Given path '/inbox'
+    And request inbox
+    When method post
+    Then status 401