patch 8.1.1610: there is no way to add or load a buffer without side effects
Problem: There is no way to add or load a buffer without side effects.
Solution: Add the bufadd() and bufload() functions.
diff --git a/src/testdir/test_functions.vim b/src/testdir/test_functions.vim
index cd3f253..34a4bbf 100644
--- a/src/testdir/test_functions.vim
+++ b/src/testdir/test_functions.vim
@@ -1515,3 +1515,31 @@
func Test_eventhandler()
call assert_equal(0, eventhandler())
endfunc
+
+func Test_bufadd_bufload()
+ call assert_equal(0, bufexists('someName'))
+ let buf = bufadd('someName')
+ call assert_notequal(0, buf)
+ call assert_equal(1, bufexists('someName'))
+ call assert_equal(0, getbufvar(buf, '&buflisted'))
+ call assert_equal(0, bufloaded(buf))
+ call bufload(buf)
+ call assert_equal(1, bufloaded(buf))
+ call assert_equal([''], getbufline(buf, 1, '$'))
+
+ let curbuf = bufnr('')
+ call writefile(['some', 'text'], 'otherName')
+ let buf = bufadd('otherName')
+ call assert_notequal(0, buf)
+ call assert_equal(1, bufexists('otherName'))
+ call assert_equal(0, getbufvar(buf, '&buflisted'))
+ call assert_equal(0, bufloaded(buf))
+ call bufload(buf)
+ call assert_equal(1, bufloaded(buf))
+ call assert_equal(['some', 'text'], getbufline(buf, 1, '$'))
+ call assert_equal(curbuf, bufnr(''))
+
+ bwipe someName
+ bwipe otherName
+ call assert_equal(0, bufexists('someName'))
+endfunc