diff --git a/src/testdir/vim9.vim b/src/testdir/vim9.vim
index 5877a79..782809b 100644
--- a/src/testdir/vim9.vim
+++ b/src/testdir/vim9.vim
@@ -110,6 +110,40 @@
   endtry
 enddef
 
+# :source a list of "lines" and check whether it fails with "error"
+export def CheckSourceFailure(lines: list<string>, error: string, lnum = -3)
+  new
+  setline(1, lines)
+  try
+    assert_fails('source', error, lines, lnum)
+  finally
+    bw!
+  endtry
+enddef
+
+# :source a list of "lines" and check whether it fails with the list of
+# "errors"
+export def CheckSourceFailureList(lines: list<string>, errors: list<string>, lnum = -3)
+  new
+  setline(1, lines)
+  try
+    assert_fails('source', errors, lines, lnum)
+  finally
+    bw!
+  endtry
+enddef
+
+# :source a list of "lines" and check whether it succeeds
+export def CheckSourceSuccess(lines: list<string>)
+  new
+  setline(1, lines)
+  try
+    :source
+  finally
+    bw!
+  endtry
+enddef
+
 export def CheckDefAndScriptSuccess(lines: list<string>)
   CheckDefSuccess(lines)
   CheckScriptSuccess(['vim9script'] + lines)