diff --git a/lib/displayHelper.ts b/lib/displayHelper.ts
index 3b68777d..63aef5b9 100644
--- a/lib/displayHelper.ts
+++ b/lib/displayHelper.ts
@@ -8,7 +8,8 @@ export function getNowYMD(dt:Date, locale?:string):string{
       const hh = ("00" + dt.getHours()).slice(-2);
       const mm = ("00" + dt.getMinutes()).slice(-2);
       const result = y + "年" + m + "月" + d + "日" + hh + "時" + mm + "分";
-      return result
+      // TODO: 意図的に失敗するようにしている
+      return result + '_bar'
     case 'en':
       return dt.toLocaleString('en-JP');
     case 'es':
diff --git a/test-unit/components/Logo.vue.spec.js b/test-unit/components/Logo.vue.spec.js
deleted file mode 100644
index 83bc4037..00000000
--- a/test-unit/components/Logo.vue.spec.js
+++ /dev/null
@@ -1,24 +0,0 @@
-// Import the required libraries
-import { mount } from '@vue/test-utils';
-import Logo from '~/components/Logo.vue';
-
-// Describe the test suite
-describe('Logo', () => {
-  // Test if the component renders correctly
-  it('renders the component', () => {
-    const wrapper = mount(Logo);
-    expect(wrapper.exists()).toBe(true);
-  });
-
-  // You can add more specific tests for your component's behavior here
-  // For example, testing the presence and styling of individual triangles
-
-  it('contains four triangles with correct styling', () => {
-    const wrapper = mount(Logo);
-    const triangles = wrapper.findAll('.Triangle');
-
-    expect(triangles).toHaveLength(4);
-  });
-
-  // Add more tests as needed
-});
diff --git a/test-unit/lib/displayHelper.spec.js b/test-unit/lib/displayHelper.spec.js
index bf4d2fd1..3615eda1 100644
--- a/test-unit/lib/displayHelper.spec.js
+++ b/test-unit/lib/displayHelper.spec.js
@@ -17,6 +17,7 @@ describe('getNowYMD', () => {
     const mockDate = new Date('2022-01-05T12:34:56');
     const result = getNowYMD(mockDate, 'en');
     const expected = mockDate.toLocaleString('en-US');
-    expect(result).toBe(expected);
+    // TODO: 意図的に失敗するようにしている
+    expect(result).toBe(expected + '_foo');
   });
-});
\ No newline at end of file
+});