diff --git a/tests/unit/mentor-welcome-email.test.ts b/tests/unit/mentor-welcome-email.test.ts
index fbf601e..fb8f41d 100644
--- a/tests/unit/mentor-welcome-email.test.ts
+++ b/tests/unit/mentor-welcome-email.test.ts
@@ -16,13 +16,17 @@ describe('getMentorBulkAssignmentTemplate', () => {
         },
       ],
       'https://x/mentor',
-      'Please reach out this week.',
+      'Reach out <b>now</b> & soon',
     )
     expect(t.html).toContain('bob@team.com')
     expect(t.html).toContain('How to mentor on MOPC')
-    expect(t.html).toContain('Please reach out this week.')
+    // The admin-supplied custom note must be HTML-escaped in the HTML body.
+    expect(t.html).toContain('&lt;b&gt;')
+    expect(t.html).not.toContain('<b>now</b>')
     expect(t.text).toContain('bob@team.com')
     expect(t.text).toContain('How to mentor on MOPC')
+    // The plain-text body keeps the raw note unescaped.
+    expect(t.text).toContain('Reach out <b>now</b> & soon')
   })
 
   it('renders without team members or note (backward compatible)', () => {
@@ -51,6 +55,10 @@ describe('getTeamMentorIntroductionTemplate', () => {
     expect(t.html).toContain('carol@team.com')
     expect(t.html).toContain('Working with your mentor')
     expect(t.html).toContain('Welcome aboard!')
+    // Mirror coverage on the plain-text path.
+    expect(t.text).toContain('alice@mentor.com')
+    expect(t.text).toContain('carol@team.com')
+    expect(t.text).toContain('Welcome aboard!')
   })
 
   it('renders without teammates or note (backward compatible)', () => {