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+# Automated tests
+
+TLDR: run `v test-all` locally, after making your changes,
+and before submitting PRs.
+
+## Notes
+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.
+
+## `vlib/v/tests`
+
+General runnable tests for different features of the V compiler.
+
+* `vlib/v/tests/inout/compiler_test.v`
+
+Test output of running a V program matches an expected .out file.
+Check the source for how to test panics.
+
+* `vlib/v/gen/c/coutput_test.v`
+
+This tests whether the generated C source code matches all expectations,
+specified in *.c.must_have files, in the folder vlib/v/gen/c/testdata/ .
+
+Each `.c.must_have` file has to have a corresponding .vv file.
+
+Each `.c.must_have` file, consists of multiple lines. Each of these
+lines, *should* be present *at least once* in the output, when the .vv
+file is compiled with `-o -` .
+
+* `vlib/v/tests/run_project_folders_test.v`
+Tests whether whole project folders can be compiled, and run.
+NB: Each project in these folders, should finish with exit code 0,
+and it should output `OK` as its last stdout line.
+
+## Test building of actual V programs (examples, tools, V itself)
+
+* `v build-tools`
+* `v build-examples`
+* `v build-vbinaries`
+
+## vfmt tests
+
+In `vlib/v/fmt/` there are::
+
+* `v vlib/v/fmt/fmt_test.v`
+
+This checks `.out` tests.
+
+* `v vlib/v/fmt/fmt_keep_test.v`
+
+This verifies that `_keep.v` files would be unchanged by `vfmt -w`.
+
+* `v vlib/v/fmt/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.
+
+## Markdown
+
+* `v check-md -hide-warnings .`
+
+Ensure that all .md files in the project are formatted properly,
+and that the V code block examples in them can be compiled/formatted too.
+
+## `.github/workflows/ci.yml`
+
+This runs various CI tests, e.g.:
+
+* `v vet vlib/v` - style checker
+* `v fmt -verify` on certain source files
+
+## `v test-cleancode`
+
+Check that most .v files, are invariant of `v fmt` runs.
+
+## `v test-self`
+
+Run `vlib` module tests, *including* the compiler tests.
+
+## `v vlib/v/compiler_errors_test.v`
+
+This runs tests for:
+* `vlib/v/checker/tests/*.vv`
+* `vlib/v/parser/tests/*.vv`
+
+### Special folders that compiler_errors_test.v will try to
+run/compile with specific options:
+
+vlib/v/checker/tests/globals_run/ - `-enable-globals run`; 
+results stored in `.run.out` files, matching the .vv ones.
+
+## `v test-all`
+
+Test and build *everything*. Usefull to verify *locally*, that the CI will
+most likely pass. Slowest, but most comprehensive.
+
+It works, by running these in succession:
+* `v test-cleancode`
+* `v test-self`
+* `v test-fmt`
+* `v build-tools`
+* `v build-examples`
+* `v check-md -hide-warnings .`
+* `v install nedpals.args`