diff --git a/dictation_server/src/common/test/overrides.ts b/dictation_server/src/common/test/overrides.ts
index a24758c..e791d1c 100644
--- a/dictation_server/src/common/test/overrides.ts
+++ b/dictation_server/src/common/test/overrides.ts
@@ -1,5 +1,10 @@
-import { ConflictError } from '../../gateways/adb2c/adb2c.service';
+import {
+  AdB2cService,
+  ConflictError,
+} from '../../gateways/adb2c/adb2c.service';
+import { SendGridService } from '../../gateways/sendgrid/sendgrid.service';
 import { User, newUser } from '../../repositories/users/entity/user.entity';
+import { UsersRepositoryService } from '../../repositories/users/users.repository.service';
 
 // ### ユニットテスト用コード以外では絶対に使用してはいけないダーティな手段を使用しているが、他の箇所では使用しないこと ###
 
@@ -19,12 +24,11 @@ export const overrideAdB2cService = <TService>(
     ) => Promise<{ sub: string } | ConflictError>;
   },
 ): void => {
-  const { createUser } = overrides;
   // テストコードでのみ許される強引な方法でprivateメンバ変数の参照を取得
-  const obj = (service as any).adB2cService;
-  if (createUser) {
-    Object.defineProperty(obj, createUser.name, {
-      value: createUser,
+  const obj = (service as any).adB2cService as AdB2cService;
+  if (overrides.createUser) {
+    Object.defineProperty(obj, obj.createUser.name, {
+      value: overrides.createUser,
       writable: true,
     });
   }
@@ -58,24 +62,18 @@ export const overrideSendgridService = <TService>(
     ) => Promise<void>;
   },
 ): void => {
-  const {
-    createMailContentFromEmailConfirm,
-    createMailContentFromEmailConfirmForNormalUser,
-    sendMail,
-  } = overrides;
-
   // テストコードでのみ許される強引な方法でprivateメンバ変数の参照を取得
-  const obj = (service as any).sendgridService;
-  if (sendMail) {
-    Object.defineProperty(obj, sendMail.name, {
-      value: sendMail,
+  const obj = (service as any).sendgridService as SendGridService;
+  if (overrides.sendMail) {
+    Object.defineProperty(obj, obj.sendMail.name, {
+      value: overrides.sendMail,
       writable: true,
     });
   } else {
     // [重要]
     // sendMailだけは外部に対する送信を行ってしまう & 失敗によりメールアドレス自体の信頼度が変動してしまうため、
     // overrideした場合には"必ず"偽物の呼び出しになるようにしておく
-    Object.defineProperty(obj, sendMail.name, {
+    Object.defineProperty(obj, obj.sendMail.name, {
       value: async () => {
         return;
       },
@@ -83,19 +81,19 @@ export const overrideSendgridService = <TService>(
     });
   }
 
-  if (createMailContentFromEmailConfirm) {
-    Object.defineProperty(obj, createMailContentFromEmailConfirm.name, {
-      value: createMailContentFromEmailConfirm,
+  if (overrides.createMailContentFromEmailConfirm) {
+    Object.defineProperty(obj, obj.createMailContentFromEmailConfirm.name, {
+      value: overrides.createMailContentFromEmailConfirm,
       writable: true,
     });
   }
 
-  if (createMailContentFromEmailConfirmForNormalUser) {
+  if (overrides.createMailContentFromEmailConfirmForNormalUser) {
     Object.defineProperty(
       obj,
-      createMailContentFromEmailConfirmForNormalUser.name,
+      obj.createMailContentFromEmailConfirmForNormalUser.name,
       {
-        value: createMailContentFromEmailConfirmForNormalUser,
+        value: overrides.createMailContentFromEmailConfirmForNormalUser,
         writable: true,
       },
     );
@@ -114,12 +112,11 @@ export const overrideUsersRepositoryService = <TService>(
     createNormalUser?: (user: newUser) => Promise<User>;
   },
 ): void => {
-  const { createNormalUser } = overrides;
   // テストコードでのみ許される強引な方法でprivateメンバ変数の参照を取得
-  const obj = (service as any).usersRepository;
-  if (createNormalUser) {
-    Object.defineProperty(obj, createNormalUser.name, {
-      value: createNormalUser,
+  const obj = (service as any).usersRepository as UsersRepositoryService;
+  if (overrides.createNormalUser) {
+    Object.defineProperty(obj, obj.createNormalUser.name, {
+      value: overrides.createNormalUser,
       writable: true,
     });
   }