nix-super/tests/lang/framework.sh
John Ericson e072e18475 Fix race condition in the language tests
When we pipe to `>(...)` like that, we unfortunately don't wait for the
process to finish. Better to just substitute the file.

Also, use the "unified" diff output that people (including myself) are
more familiar with, thanks to Git.
2023-07-13 08:09:03 -04:00

33 lines
1,010 B
Bash

# Golden test support
#
# Test that the output of the given test matches what is expected. If
# `_NIX_TEST_ACCEPT` is non-empty also update the expected output so
# that next time the test succeeds.
function diffAndAcceptInner() {
local -r testName=$1
local -r got="$2"
local -r expected="$3"
# Absence of expected file indicates empty output expected.
if test -e "$expected"; then
local -r expectedOrEmpty="$expected"
else
local -r expectedOrEmpty=lang/empty.exp
fi
# Diff so we get a nice message
if ! diff --unified "$got" "$expectedOrEmpty"; then
echo "FAIL: evaluation result of $testName not as expected"
badDiff=1
fi
# Update expected if `_NIX_TEST_ACCEPT` is non-empty.
if test -n "${_NIX_TEST_ACCEPT-}"; then
cp "$got" "$expected"
# Delete empty expected files to avoid bloating the repo with
# empty files.
if ! test -s "$expected"; then
rm "$expected"
fi
fi
}