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v/TESTS.md

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# Automated tests
In the `v` repo there are several different tests. The main types are:
* `_test.v` tests - check that `test_` functions succeed. These can be
run per directory or individually.
* `.out` tests - run a `.vv` file and check the output matches the
contents of the `.out` file with the same base name. This is
particularly useful for checking that errors are printed.
Tip: use `v -cc tcc` when compiling tests for speed.
## `v test-compiler`
This builds and tests:
* `vc` repo
* `_test.v` files
* examples
* `v install` a module
Some of these can be invoked separately.
## `vlib/v/compiler_errors_test.v`
This runs tests for:
* `checker/tests/*.vv`
* `parser/tests/*.vv`
## `vlib/v/tests`
General runnable program tests.
## Actual code
* `v build-examples`
* `v build-tools`
## `v test-fixed`
Test `vlib`.
## vfmt tests
In `vlib/v/fmt/` there's:
* `fmt_test.v`
This checks `.out` tests.
* `fmt_keep_test.v`
This verifies that `_keep.v` files would be unchanged by `vfmt -w`.
* `fmt_vlib_test.v`
This checks all source files are formatted and prints a summary. This
is not required.
* `v test-fmt`
Test all files in the current directory are formatted.
## `.github/workflows/ci.yml`
This runs various CI tests, e.g.:
* `v vet vlib/v` - style checker
* `v fmt -verify` on certain source files