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docs: clarify TESTS.md
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Delyan Angelov
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TESTS.md
242
TESTS.md
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# Automated tests
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TLDR: run `v test-all` locally, after making your changes,
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TLDR: do run `v test-all` locally, after making your changes,
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and before submitting PRs.
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## Notes
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In the `v` repo there are several different tests. The main types are:
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* `_test.v` tests - check that `test_` functions succeed. These can be
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run per directory or individually.
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* `.out` tests - run a `.vv` file and check the output matches the
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contents of the `.out` file with the same base name. This is
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particularly useful for checking that errors are printed.
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Tip: use `v -cc tcc` when compiling tests for speed.
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## `vlib/v/tests`
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General runnable tests for different features of the V compiler.
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* `vlib/v/tests/inout/compiler_test.v`
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Test output of running a V program matches an expected .out file.
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Check the source for how to test panics.
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* `vlib/v/gen/c/coutput_test.v`
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This tests whether the generated C source code matches all expectations,
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specified in *.c.must_have files, in the folder vlib/v/gen/c/testdata/ .
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Each `.c.must_have` file has to have a corresponding .vv file.
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Each `.c.must_have` file, consists of multiple lines. Each of these
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lines, *should* be present *at least once* in the output, when the .vv
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file is compiled with `-o -` .
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* `vlib/v/tests/run_project_folders_test.v`
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Tests whether whole project folders can be compiled, and run.
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NB: Each project in these folders, should finish with exit code 0,
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and it should output `OK` as its last stdout line.
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## Test building of actual V programs (examples, tools, V itself)
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* `v build-tools`
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* `v build-examples`
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* `v build-vbinaries`
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## vfmt tests
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In `vlib/v/fmt/` there are::
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* `v vlib/v/fmt/fmt_test.v`
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This checks `.out` tests.
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* `v vlib/v/fmt/fmt_keep_test.v`
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This verifies that `_keep.v` files would be unchanged by `vfmt -w`.
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* `v vlib/v/fmt/fmt_vlib_test.v`
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This checks all source files are formatted and prints a summary.
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This is not required.
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* `v test-fmt`
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Test all files in the current directory are formatted.
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## Markdown
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* `v check-md -hide-warnings .`
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Ensure that all .md files in the project are formatted properly,
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and that the V code block examples in them can be compiled/formatted too.
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## `.github/workflows/ci.yml`
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This runs various CI tests, e.g.:
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* `v vet vlib/v` - style checker
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* `v fmt -verify` on certain source files
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## `v test-cleancode`
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Check that most .v files, are invariant of `v fmt` runs.
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## `v test-self`
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Run `vlib` module tests, *including* the compiler tests.
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## `v vlib/v/compiler_errors_test.v`
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This runs tests for:
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* `vlib/v/checker/tests/*.vv`
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* `vlib/v/parser/tests/*.vv`
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### Special folders that compiler_errors_test.v will try to
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run/compile with specific options:
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vlib/v/checker/tests/globals_run/ - `-enable-globals run`;
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results stored in `.run.out` files, matching the .vv ones.
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Tip: use `v -cc tcc` when compiling tests, because TCC is much faster,
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compared to most other C compilers like clang/gcc/msvc. Most test commands
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will use the V compiler and the V tools many times, potentially
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hundreds/thousands of times.
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## `v test-all`
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@ -113,3 +21,143 @@ It works, by running these in succession:
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* `v build-examples`
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* `v check-md -hide-warnings .`
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* `v install nedpals.args`
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# Details:
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In the `v` repo there are many tests. The main types are:
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## `_test.v` tests - these are the normal V test files.
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All `test_` functions in these files, will be ran automatically by
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V's test framework.
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NB 1: You can run test files one by one, with:
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`v file_test.v` - this will run the test_ functions in file_test.v,
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and will exit with a 0 exit code, if they all had 0 failing assertions.
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`v -stats file_test.v` - this will run the test_ functions, and show a
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report about how much time it took to run each of them too.
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NB 2: You can also run many test files at once (in parallel, depending on
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how many cores you have), with:
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`v test folder` - this will run *all* `_test.v` files in `folder`,
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recursively.
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`v -stats test folder` - same, but will also produce timing reports
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about how fast each test_ function in each _test.v file ran.
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## `v test vlib/v/tests`:
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This folder contains _test.v files, testing the different features of the V
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compiler. Each of them will be compiled, and all the features in them have
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to work (verified by assertions).
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## `v vlib/v/tests/inout/compiler_test.v`
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This is a *test runner*, that checks whether the output of running a V program,
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matches an expected .out file. You can also check for code that does panic
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using this test runner - just paste the start of the `panic()` output in the
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corresponding .out file.
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NB: these tests, expect to find a pair of `.vv` and `.out` files, in the folder:
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vlib/v/tests/inout
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The test runner will run each `.vv` file, and will check that its output, matches
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the contents of the `.out` file with the same base name. This is particularly useful
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for checking that errors and panics are printed.
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## `v vlib/v/gen/c/coutput_test.v`
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coutput_test.v is a *test runner*, that checks whether the generated C source
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code matches *all* expectations, specified in *.c.must_have files, in the
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folder vlib/v/gen/c/testdata/ .
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Each `.c.must_have` file, *has* to have a corresponding `.vv` file.
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Each `.c.must_have` file, consists of multiple lines. Each of these
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lines, *should* be present *at least once* in the output, when the .vv
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file is compiled with `-o -` .
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## `v vlib/v/tests/run_project_folders_test.v`
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This *test runner*, checks whether whole project folders, can be compiled, and run.
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NB: Each project in these folders, should finish with an exit code of 0,
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and it should output `OK` as its last stdout line.
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## Test building of actual V programs (examples, tools, V itself)
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* `v build-tools`
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* `v build-examples`
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* `v build-vbinaries`
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## Formatting tests
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In `vlib/v/fmt/` there are:
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* `v vlib/v/fmt/fmt_test.v`
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This checks `.out` tests.
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* `v vlib/v/fmt/fmt_keep_test.v`
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This verifies that all `_keep.vv` files in the `vlib/v/fmt/tests/` folder,
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would be unchanged by `v fmt -w`, i.e. that the v source code formatter,
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generates a stable source output, that does not change, once it is already
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formatted once.
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* `v vlib/v/fmt/fmt_vlib_test.v`
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This checks that all V source files are formatted, and prints a summary.
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This is not required.
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* `v test-cleancode`
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Check that most .v files, are invariant of `v fmt` runs.
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* `v test-fmt`
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This tests that all .v files in the current folder are already formatted.
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It is useful for adding to CI jobs, to guarantee, that future contributions
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will keep the existing source nice and clean.
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## Markdown/documentation checks:
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* `v check-md -hide-warnings .`
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Ensure that all .md files in the project are formatted properly,
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and that the V code block examples in them can be compiled/formatted too.
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## `v test-self`
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Run `vlib` module tests, *including* the compiler tests.
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## `v vlib/v/compiler_errors_test.v`
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This runs tests for:
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* `vlib/v/scanner/tests/*.vv`
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* `vlib/v/checker/tests/*.vv`
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* `vlib/v/parser/tests/*.vv`
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NB: there are special folders, that compiler_errors_test.v will try to
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run/compile with specific options:
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vlib/v/checker/tests/globals_run/ - `-enable-globals run`;
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results stored in `.run.out` files, matching the .vv ones.
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NB 2: in case you need to modify many .out files, run *twice* in a row:
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`VAUTOFIX=1 ./v vlib/v/compiler_errors_test.v`
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This will fail the first time, but it will record the new output for each
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.vv file, and store it into the corresponding .out file. The second run
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should be now successfull, and so you can inspect the difference, and
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commit the new .out files with minimum manual effort.
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NB 3: To run only some of the tests, use:
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`VTEST_ONLY=mismatch ./v vlib/v/compiler_errors_test.v`
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This will check only the .vv files, whose paths match the given filter.
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## `.github/workflows/ci.yml`
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This is a Github Actions configuration file, that runs various CI
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tests in the main V repository, for example:
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* `v vet vlib/v` - run a style checker.
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* `v test-self` (run self tests) in various compilation modes.
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