patch 9.1.0415: Some functions are not tested

Problem:  Some functions are not tested
Solution: Add a few more tests, fix a few minor problems
          (Yegappan Lakshmanan)

closes: #14789

Signed-off-by: Yegappan Lakshmanan <yegappan@yahoo.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/testdir/test_vim9_import.vim b/src/testdir/test_vim9_import.vim
index 61184a1..3067ef6 100644
--- a/src/testdir/test_vim9_import.vim
+++ b/src/testdir/test_vim9_import.vim
@@ -3311,4 +3311,20 @@
   delete('Xoutput.log')
 enddef
 
+" Test for changing a locked imported variable
+def Test_import_locked_var()
+  var lines =<< trim END
+    vim9script
+    export var Foo: number = 10
+    lockvar Foo
+  END
+  writefile(lines, 'Ximportlockedvar.vim', 'D')
+  lines =<< trim END
+    vim9script
+    import './Ximportlockedvar.vim' as Bar
+    Bar.Foo = 20
+  END
+  v9.CheckScriptFailure(lines, 'E741: Value is locked: Foo', 3)
+enddef
+
 " vim: ts=8 sw=2 sts=2 expandtab tw=80 fdm=marker