Make sure delete mobile number only shown when needed

Users who have no mobile number set, users who are not on email auth
and users who are not on "Change mobile number" page should not
see the delete link.

tests/app/main/views/test_user_profile.py

@@ -12,6 +12,8 @@ from app.models.webauthn_credential import (
 )
 from tests.conftest import (
     create_api_user_active,
+    create_user,
+    fake_uuid,
     normalize_spaces,
     url_for_endpoint_with_token,
 )
@@ -91,6 +93,8 @@ def test_should_show_email_page(
         'main.user_profile_email'
     )
     assert page.select_one('h1').text.strip() == 'Change your email address'
+    # template is shared with "Change your mobile number" but we don't want to show Delete mobile number link
+    assert 'Delete your number' not in page.text
 
 
 def test_should_redirect_after_email_change(
@@ -197,6 +201,22 @@ def test_change_your_mobile_number_page_shows_delete_link_if_user_on_email_auth(
     assert 'Delete your number' in page.text
 
 
+def test_change_your_mobile_number_page_doesnt_show_delete_link_if_user_has_no_mobile_number(
+    client_request,
+    api_user_active_email_auth,
+    mocker
+):
+    user = create_user(
+        id=fake_uuid,
+        auth_type='email_auth',
+        mobile_number=None
+    )
+    mocker.patch('app.user_api_client.get_user', return_value=user)
+    page = client_request.get(('main.user_profile_mobile_number'))
+    assert 'Change your mobile number' in page.text
+    assert 'Delete your number' not in page.text
+
+
 def test_confirm_delete_mobile_number(
     client_request,
     api_user_active_email_auth,