test-file does not seem to be working

[moneylobster]

test-docstring seems to be misspelled here:

sijo-doctest/src/doctest.lisp

Line 317 in 29a0eaa

(test-docstrting docstring :output output :test test))

However, fixing the typo resulted in this error on SBCL on Windows:

The value
  #<SB-SYS:FD-STREAM for "file FILENAME_HERE" {10040F2433}>

is not of type
  STRING

the actual function raising the error is SB-IMPL::%INIT-STRING-INPUT-STREAM, called in TEST-DOCSTRING.
run-doctests seems to have been called on that line instead of test-docstring prior to 24eb592, and modifying the line to become

(run-doctests docstring output))

seems to yield valid results at a cursory glance. Can you reproduce the same error when the typo is fixed?