patch 8.2.1184: some tests fail

Problem:    Some tests fail.
Solution:   Adjust tests for different assert_fails() behavior.  Remove unused
            variable.
diff --git a/src/testdir/test_eval_stuff.vim b/src/testdir/test_eval_stuff.vim
index 3a229b5..6d95cc0 100644
--- a/src/testdir/test_eval_stuff.vim
+++ b/src/testdir/test_eval_stuff.vim
@@ -1,5 +1,7 @@
 " Tests for various eval things.
 
+source view_util.vim
+
 function s:foo() abort
   try
     return [] == 0
@@ -17,13 +19,8 @@
     throw 1
   catch
   endtry
-  echoerr 'wrong'
-  let c1 = nr2char(screenchar(&lines, 1))
-  let c2 = nr2char(screenchar(&lines, 2))
-  let c3 = nr2char(screenchar(&lines, 3))
-  let c4 = nr2char(screenchar(&lines, 4))
-  let c5 = nr2char(screenchar(&lines, 5))
-  call assert_equal('wrong', c1 . c2 . c3 . c4 . c5)
+  echoerr 'wrong again'
+  call assert_equal('wrong again', ScreenLine(&lines))
 endfunc
 
 func Test_mkdir_p()