diff --git a/src/testdir/test_vim9_func.vim b/src/testdir/test_vim9_func.vim
index 4efb48e..bf81bbe 100644
--- a/src/testdir/test_vim9_func.vim
+++ b/src/testdir/test_vim9_func.vim
@@ -30,7 +30,7 @@
 def Test_return_something()
   assert_equal('string', ReturnString())
   assert_equal(123, ReturnNumber())
-  assert_fails('ReturnGlobal()', 'E1029: Expected number but got string')
+  assert_fails('ReturnGlobal()', 'E1029: Expected number but got string', '', 1, 'ReturnGlobal')
 enddef
 
 def Test_missing_return()
@@ -112,7 +112,7 @@
 def Test_call_default_args()
   assert_equal('string', MyDefaultArgs())
   assert_equal('one', MyDefaultArgs('one'))
-  assert_fails('MyDefaultArgs("one", "two")', 'E118:')
+  assert_fails('MyDefaultArgs("one", "two")', 'E118:', '', 3, 'Test_call_default_args')
 
   assert_equal('test', MyDefaultSecond('test'))
   assert_equal('test', MyDefaultSecond('test', true))
@@ -139,7 +139,7 @@
 func Test_call_default_args_from_func()
   call assert_equal('string', MyDefaultArgs())
   call assert_equal('one', MyDefaultArgs('one'))
-  call assert_fails('call MyDefaultArgs("one", "two")', 'E118:')
+  call assert_fails('call MyDefaultArgs("one", "two")', 'E118:', '', 3, 'Test_call_default_args_from_func')
 endfunc
 
 def Test_nested_global_function()
@@ -245,7 +245,7 @@
 enddef
 
 def Test_call_def_varargs()
-  assert_fails('MyDefVarargs()', 'E119:')
+  assert_fails('MyDefVarargs()', 'E119:', '', 1, 'Test_call_def_varargs')
   assert_equal('one,foo', MyDefVarargs('one'))
   assert_equal('one,two', MyDefVarargs('one', 'two'))
   assert_equal('one,two,three', MyDefVarargs('one', 'two', 'three'))
@@ -362,7 +362,7 @@
 
 def Test_using_var_as_arg()
   writefile(['def Func(x: number)',  'let x = 234', 'enddef', 'defcompile'], 'Xdef')
-  assert_fails('so Xdef', 'E1006:')
+  assert_fails('so Xdef', 'E1006:', '', 1, 'Func')
   delete('Xdef')
 enddef
 
@@ -388,7 +388,7 @@
 
 def Test_call_func_defined_later()
   assert_equal('one', g:DefinedLater('one'))
-  assert_fails('NotDefined("one")', 'E117:')
+  assert_fails('NotDefined("one")', 'E117:', '', 2, 'Test_call_func_defined_later')
 enddef
 
 func DefinedLater(arg)
@@ -397,8 +397,8 @@
 
 def Test_call_funcref()
   assert_equal(3, g:SomeFunc('abc'))
-  assert_fails('NotAFunc()', 'E117:') # comment after call
-  assert_fails('g:NotAFunc()', 'E117:')
+  assert_fails('NotAFunc()', 'E117:', '', 2, 'Test_call_funcref') # comment after call
+  assert_fails('g:NotAFunc()', 'E117:', '', 3, 'Test_call_funcref')
 
   let lines =<< trim END
     vim9script
@@ -524,7 +524,7 @@
 
 def Test_error_in_nested_function()
   # Error in called function requires unwinding the call stack.
-  assert_fails('FuncWithForwardCall()', 'E1096:')
+  assert_fails('FuncWithForwardCall()', 'E1096:', 1, 'FuncWithForwardCall')
 enddef
 
 def Test_return_type_wrong()
@@ -705,7 +705,7 @@
     defcompile
   END
   writefile(lines, 'Xcall_const.vim')
-  assert_fails('source Xcall_const.vim', 'E46:')
+  assert_fails('source Xcall_const.vim', 'E46:', '', 1, 'MyFunc')
   delete('Xcall_const.vim')
 enddef
 
@@ -736,8 +736,8 @@
     CallGoneSoon()
   END
   writefile(lines, 'XToDelFunc')
-  assert_fails('so XToDelFunc', 'E933:')
-  assert_fails('so XToDelFunc', 'E933:')
+  assert_fails('so XToDelFunc', 'E933:', '', 1, 'CallGoneSoon')
+  assert_fails('so XToDelFunc', 'E933:', '', 1, 'CallGoneSoon')
 
   delete('XToDelFunc')
 enddef
@@ -748,7 +748,7 @@
   writefile(['def Func1(): string',  'return "Func1"', 'enddef'], 'Xdef')
   so Xdef
   writefile(['def! Func0(): string', 'enddef', 'defcompile'], 'Xdef')
-  assert_fails('so Xdef', 'E1027:')
+  assert_fails('so Xdef', 'E1027:', '', 1, 'Func0')
   writefile(['def Func2(): string',  'return "Func2"', 'enddef'], 'Xdef')
   so Xdef
   delete('Xdef')
@@ -824,7 +824,7 @@
     defcompile
   END
   call writefile(l, 'Xinvalidarg')
-  call assert_fails('so Xinvalidarg', 'E118:')
+  call assert_fails('so Xinvalidarg', 'E118:', '', 1, 'FArgErr')
   let l =<< trim END
     def! FArgErr(): float
       return ceil()
@@ -832,7 +832,7 @@
     defcompile
   END
   call writefile(l, 'Xinvalidarg')
-  call assert_fails('so Xinvalidarg', 'E119:')
+  call assert_fails('so Xinvalidarg', 'E119:', '', 1, 'FArgErr')
   call delete('Xinvalidarg')
 endfunc