mirror of
https://github.com/NixOS/nix.git
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78 lines
2.7 KiB
Bash
78 lines
2.7 KiB
Bash
# shellcheck shell=bash
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# Golden test support
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#
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# Test that the output of the given test matches what is expected. If
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# `_NIX_TEST_ACCEPT` is non-empty also update the expected output so
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# that next time the test succeeds.
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function diffAndAcceptInner() {
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local -r testName=$1
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local -r got="$2"
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local -r expected="$3"
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# Absence of expected file indicates empty output expected.
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if test -e "$expected"; then
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local -r expectedOrEmpty="$expected"
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else
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local -r expectedOrEmpty=characterisation/empty
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fi
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# Diff so we get a nice message
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if ! diff --color=always --unified "$expectedOrEmpty" "$got"; then
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echo "FAIL: evaluation result of $testName not as expected"
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# shellcheck disable=SC2034
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badDiff=1
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fi
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# Update expected if `_NIX_TEST_ACCEPT` is non-empty.
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if test -n "${_NIX_TEST_ACCEPT-}"; then
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cp "$got" "$expected"
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# Delete empty expected files to avoid bloating the repo with
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# empty files.
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if ! test -s "$expected"; then
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rm "$expected"
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fi
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fi
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}
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function characterisationTestExit() {
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# Make sure shellcheck knows all these will be defined by the caller
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: "${badDiff?} ${badExitCode?}"
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if test -n "${_NIX_TEST_ACCEPT-}"; then
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if (( "$badDiff" )); then
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set +x
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echo 'Output did mot match, but accepted output as the persisted expected output.'
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echo 'That means the next time the tests are run, they should pass.'
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set -x
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else
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set +x
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echo 'NOTE: Environment variable _NIX_TEST_ACCEPT is defined,'
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echo 'indicating the unexpected output should be accepted as the expected output going forward,'
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echo 'but no tests had unexpected output so there was no expected output to update.'
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set -x
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fi
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if (( "$badExitCode" )); then
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exit "$badExitCode"
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else
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skipTest "regenerating golden masters"
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fi
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else
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if (( "$badDiff" )); then
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set +x
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echo ''
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echo 'You can rerun this test with:'
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echo ''
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echo " _NIX_TEST_ACCEPT=1 make tests/functional/${TEST_NAME}.test"
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echo ''
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echo 'to regenerate the files containing the expected output,'
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echo 'and then view the git diff to decide whether a change is'
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echo 'good/intentional or bad/unintentional.'
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echo 'If the diff contains arbitrary or impure information,'
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echo 'please improve the normalization that the test applies to the output.'
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set -x
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fi
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exit $(( "$badExitCode" + "$badDiff" ))
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fi
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}
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