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eval: add v:_null_string

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Replacement for Vim's test_null_string().
Vim uses it to verify that its codebase handles null strings.
Preparation for the Test_null_list() in patch v8.2.1822.

Use v:_null_string, not non-existent env var, for null string tests.

Mention v:_null_string in id() because id(v:_null_string) returns (nil).
This commit is contained in:
Jan Edmund Lazo
2021-04-08 22:33:21 -04:00
parent ec273a2c6b
commit 0d0eeff8a3
5 changed files with 45 additions and 8 deletions
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10
test/functional/eval/writefile_spec.lua
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@@ -59,6 +59,16 @@ describe('writefile()', function()
eq('\n', read_file(fname))
end)
it('writes list with a null string to a file', function()
eq(0, exc_exec(
('call writefile([v:_null_string], "%s", "b")'):format(
fname)))
eq('', read_file(fname))
eq(0, exc_exec(('call writefile([v:_null_string], "%s")'):format(
fname)))
eq('\n', read_file(fname))
end)
it('appends to a file', function()
eq(nil, read_file(fname))
eq(0, funcs.writefile({'abc', 'def', 'ghi'}, fname))