Same idea as a7be4b7bf8, but that only showed the context if the
length of the string differed. Since these tests check both string
length and string content, the ctx should be provided for both.
ERROR test/unit/testutil.lua @ 797: vim_snprintf() positional arguments
test/unit/testutil.lua:769: test/unit/testutil.lua:753: (string) '
test/unit/strings_spec.lua:159: snprintf(buf, 4, "%1$0.*2$b", 12ULL, cdata<int>: 0xf78c8ed8) = 001100
Expected objects to be the same.
Passed in:
(string) '000'
Expected:
(string) '001''
1c81734871