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help: improve v help test

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Delyan Angelov 2021-12-20 19:52:05 +02:00
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33
cmd/v/help/test.txt
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@ -1,10 +1,21 @@
Usage:
v [-stats] test FILE|DIRECTORY[...]
Runs test functions in the given FILEs and DIRECTORYs
v [-stats] test FILE|DIRECTORY[...] [-run-only GPATTERN1[,...]]
Runs test functions in the given FILEs and DIRECTORYs.
If '-stats' is given, more statistics about the tests are printed along
with a report of passes/failures
If you give `-run-only GPATTERN`, then *only* test functions, that do
match by name the given glob pattern `GPATTERN` will run. You can separate
multiple glob patterns with `,`.
If a _test.v file lacks matching functions for all of the glob patterns, it
will be ignored completely, so you can do in effect:
`v test . -run-only test_your_fn_name`
... and V will run only that test function, no matter how many _test.v
files you have, and how many other test_ functions exist in them.
NB: glob patterns support `*` which matches anything, and `?`, that
matches any single character. They are *NOT* regular expressions however.
NB 1: very frequently, when you work on a module you can cd into its folder,
and then you can perform:
v test .
@ -31,3 +42,21 @@ The names of the available test runners are:
You can also implement your own custom test runner, by providing the path to
your .v file, that implements it to this option. For example, see:
vlib/v/preludes/test_runner_tap.v .
NB 5: Filtering only specific _test.v files by name:
You can set the environment variable `VTEST_ONLY` to a list of strings, that
will have to be contained in the paths of the _test.v files.
Example:
`VTEST_ONLY=complex,stats v test . -run-only *sin*`
This will find all _test.v files that have either `complex` or `stats`
in their path, then for these test files, V test will find all that contain
`test_` functions that glob match `*sin*`, and run only them, so you
should see something like this:
```
OK [1/2] 164.671 ms vlib/math/stats/stats_test.v
OK [2/2] 184.842 ms vlib/math/complex/complex_test.v
------------------------------------------------------------------------------------------
Summary for all V _test.v files: 2 passed, 2 total. Runtime: 185 ms, on 2 parallel jobs.
```