patch 8.2.4754: using cached values after unsetting some environment variables
Problem: Still using cached values after unsetting some known environment
variables.
Solution: Take care of the side effects. (closes #10194)
diff --git a/src/testdir/test_environ.vim b/src/testdir/test_environ.vim
index dd34983..d834481 100644
--- a/src/testdir/test_environ.vim
+++ b/src/testdir/test_environ.vim
@@ -28,6 +28,26 @@
call assert_equal(v:null, getenv('TEST ENV'))
endfunc
+func Test_special_env()
+ " The value for $HOME is cached internally by Vim, ensure the value is up to
+ " date.
+ let orig_ENV = $HOME
+
+ let $HOME = 'foo'
+ call assert_equal('foo', expand('~'))
+ " old $HOME value is kept until a new one is set
+ unlet $HOME
+ call assert_equal('foo', expand('~'))
+
+ call setenv('HOME', 'bar')
+ call assert_equal('bar', expand('~'))
+ " old $HOME value is kept until a new one is set
+ call setenv('HOME', v:null)
+ call assert_equal('bar', expand('~'))
+
+ let $HOME = orig_ENV
+endfunc
+
func Test_external_env()
call setenv('FOO', 'HelloWorld')
if has('win32')