- $mm->mid_set(1234, 'a@example.com') == 1 or BAIL_OUT 'mid_set once';
- ok(0 == $mm->mid_set(1234, 'a@example.com'), 'mid_set not idempotent');
- ok(0 == $mm->mid_set(1, 'a@example.com'), 'mid_set fails with dup MID');
+ is($mm->mid_set(1234, 'a@example.com'), 1, 'mid_set') or xbail 'once';
+ is($mm->mid_set(1234, 'a@example.com')+0, 0, 'mid_set not idempotent');
+ is($mm->mid_set(1, 'a@example.com')+0, 0, 'mid_set fails with dup MID');