diff --git a/src/testdir/test_mapping.vim b/src/testdir/test_mapping.vim
index e361f3e..71d9046 100644
--- a/src/testdir/test_mapping.vim
+++ b/src/testdir/test_mapping.vim
@@ -120,7 +120,7 @@
   unmap x
   bwipe!
 
-  " 'langnoremap' follows 'langremap' and vise versa
+  " 'langnoremap' follows 'langremap' and vice versa
   set langremap
   set langnoremap
   call assert_equal(0, &langremap)
diff --git a/src/testdir/test_utf8_comparisons.vim b/src/testdir/test_utf8_comparisons.vim
index 20b5762..2c1972b 100644
--- a/src/testdir/test_utf8_comparisons.vim
+++ b/src/testdir/test_utf8_comparisons.vim
@@ -93,7 +93,7 @@
   call assert_equal(["ABCD", "", "defg"], getline(1,3))
 endfunc
 
-" test that g~, ~ and gU correclty upper-cases ß
+" test that g~, ~ and gU correctly upper-cases ß
 func Test_uppercase_sharp_ss()
   new
   call setline(1, repeat(['ß'], 4))
diff --git a/src/testdir/test_vim9_class.vim b/src/testdir/test_vim9_class.vim
index 62a6d04..0bf7e9c 100644
--- a/src/testdir/test_vim9_class.vim
+++ b/src/testdir/test_vim9_class.vim
@@ -67,7 +67,7 @@
   END
   v9.CheckSourceFailure(lines, "E488: Trailing characters: | echo 'done'", 3)
 
-  # Use old "this." prefixed member variable declaration syntax (without intialization)
+  # Use old "this." prefixed member variable declaration syntax (without initialization)
   lines =<< trim END
     vim9script
     class Something
@@ -76,7 +76,7 @@
   END
   v9.CheckSourceFailure(lines, 'E1318: Not a valid command in a class: this.count: number', 3)
 
-  # Use old "this." prefixed member variable declaration syntax (with intialization)
+  # Use old "this." prefixed member variable declaration syntax (with initialization)
   lines =<< trim END
     vim9script
     class Something
diff --git a/src/testdir/test_vim9_typealias.vim b/src/testdir/test_vim9_typealias.vim
index 4155744..998079c 100644
--- a/src/testdir/test_vim9_typealias.vim
+++ b/src/testdir/test_vim9_typealias.vim
@@ -641,7 +641,7 @@
   END
   v9.CheckScriptFailure(lines, 'E1407: Cannot use a Typealias as a variable or value', 1)
 
-  # check defered function using typealias as arg
+  # check deferred function using typealias as arg
   lines =<< trim END
     vim9script
     type A = number
@@ -764,7 +764,7 @@
   END
   v9.CheckScriptFailure(lines, 'E1405: Class "C" cannot be used as a value', 1)
 
-  # check defered function using class typealias as arg
+  # check deferred function using class typealias as arg
   lines =<< trim END
     vim9script
     class C
diff --git a/src/testdir/test_visual.vim b/src/testdir/test_visual.vim
index 066d7eb..17f0fd0 100644
--- a/src/testdir/test_visual.vim
+++ b/src/testdir/test_visual.vim
@@ -1008,7 +1008,7 @@
 " Test for changing case
 func Test_visual_change_case()
   new
-  " gUe must uppercase a whole word, also when ß changes to SS
+  " gUe must uppercase a whole word, also when ß changes to ẞ
   exe "normal Gothe youtußeuu end\<Esc>Ypk0wgUe\r"
   " gUfx must uppercase until x, inclusive.
   exe "normal O- youßtußexu -\<Esc>0fogUfx\r"