lix/tests/lang/framework.sh

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# 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="$expected"
else
local -r expectedOrEmpty=lang/empty.exp
fi
# Diff so we get a nice message
if ! diff "$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
}