zsh-syntax-highlighting/tests/README.md

zsh-syntax-highlighting / tests

Utility scripts for testing zsh-syntax-highlighting highlighters.

The tests harness expects the highlighter directory to contain a test-data directory with test data files. See the main highlighter for examples.

Tests should set the following variables:

Each test should define the string $BUFFER that is to be highlighted and the array parameter $expected_region_highlight. The value of that parameter is a list of strings of the form "$i $j $style". or "$i $j $style $todo". Each string specifies the highlighting that $BUFFER[$i,$j] should have; that is, $i and $j specify a range, 1-indexed, inclusive of both endpoints. $style is a key of $ZSH_HIGHLIGHT_STYLES. If $todo exists, the test point is marked as TODO (the failure of that test point will not fail the test), and $todo is used as the explanation.

If a test sets $skip_test to a non-empty string, the test will be skipped with the provided string as the reason.

If a test sets $fail_test to a non-empty string, the test will be skipped with the provided string as the reason.

If a test sets unsorted=1 the order of highlights in $expected_region_highlight need not match the order in $region_highlight.

Normally, tests fail if $expected_region_highlight and $region_highlight have different numbers of elements. To mark this check as expected to fail, tests may set $expected_mismatch to an explanation string (like $todo); this is useful when the only difference between actual and expected is that actual has some additional, superfluous elements. This check is skipped if the $todo component is present in any regular test point.

Note: $region_highlight uses the same "$i $j $style" syntax but interprets the indexes differently.

Note: Tests are run with setopt NOUNSET WARN_CREATE_GLOBAL, so any variables the test creates must be declared local.

Isolation: Each test is run in a separate subshell, so any variables, aliases, functions, etc., it defines will be visible to the tested code (that computes $region_highlight), but will not affect subsequent tests. The current working directory of tests is set to a newly-created empty directory, which is automatically cleaned up after the test exits. For example:

setopt PATH_DIRS
mkdir -p foo/bar
touch foo/bar/testing-issue-228
chmod  +x foo/bar/testing-issue-228
path+=( "$PWD"/foo )

BUFFER='bar/testing-issue-228'

expected_region_highlight=(
  "1 21 command" # bar/testing-issue-228
)

Writing new tests

An experimental tool is available to generate test files:

zsh -f tests/generate.zsh 'ls -x' acme newfile

This generates a highlighters/acme/test-data/newfile.zsh test file based on the current highlighting of the given $BUFFER (in this case, ls -x).

This tool is experimental. Its interface may change. In particular it may grow ways to set $PREBUFFER to inject free-form code into the generated file.

Highlighting test

test-highlighting.zsh tests the correctness of the highlighting. Usage:

zsh test-highlighting.zsh <HIGHLIGHTER NAME>

All tests may be run with

make test

which will run all highlighting tests and report results in TAP format. By default, the results of all tests will be printed; to show only "interesting" results (tests that failed but were expected to succeed, or vice-versa), run make quiet-test (or make test QUIET=y).

Performance test

test-perfs.zsh measures the time spent doing the highlighting. Usage:

zsh test-perfs.zsh <HIGHLIGHTER NAME>

All tests may be run with

make perf