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test(unit/strings_spec): provide context for vim_snprintf tests

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Since these assertions all use a common function to perform the test
assertions, it's difficult to figure out which test failed:

    ERROR    test/unit/testutil.lua @ 785: vim_snprintf() positional arguments
    test/unit/testutil.lua:757: test/unit/testutil.lua:741: (string) '
    test/unit/strings_spec.lua:143: Expected objects to be the same.
    Passed in:
    (number) 6400
    Expected:
    (number) 6'
    exit code: 256

Adding context to the assertion makes it clearer what the problem is:

    ERROR    test/unit/testutil.lua @ 785: vim_snprintf() positional arguments
    test/unit/testutil.lua:757: test/unit/testutil.lua:741: (string) '
    test/unit/strings_spec.lua:149: snprintf(buf, 0, "%1$0.*2$b", cdata<unsigned int>: 0xf78d0f38, cdata<int>: 0xf78dc4e0) = 001100
    Expected objects to be the same.
    Passed in:
    (number) 6400
    Expected:
    (number) 6'
    exit code: 256

(cherry picked from commit a7be4b7bf8)
This commit is contained in:
James McCoy
2025-01-28 20:32:40 -05:00
committed by github-actions[bot]
parent 44c6fbaf9a
commit 452ed57b71
1 changed files with 7 additions and 1 deletions
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8
test/unit/strings_spec.lua
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@@ -140,7 +140,13 @@ end)
describe('vim_snprintf()', function()
local function a(expected, buf, bsize, fmt, ...)
eq(#expected, strings.vim_snprintf(buf, bsize, fmt, ...))
local args = { ... }
local ctx = string.format('snprintf(buf, %d, "%s"', bsize, fmt)
for _, x in ipairs(args) do
ctx = ctx .. ', ' .. tostring(x)
end
ctx = ctx .. string.format(') = %s', expected)
eq(#expected, strings.vim_snprintf(buf, bsize, fmt, ...), ctx)
if bsize > 0 then
local actual = ffi.string(buf, math.min(#expected + 1, bsize))
eq(expected:sub(1, bsize - 1) .. '\0', actual)