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lib/Streamly/Test | ||
Streamly/Test | ||
README.md | ||
streamly-tests.cabal | ||
version-bounds.hs |
Streamly Tests
Running tests using bin/test.sh
bin/test.sh
(path relative to the top level repo dir) can run selected
test groups, generate coverage report, pass GHC RTS options when
running tests. test.sh
runs the tests with restricted memory, see
bin/test.sh
source for details on the amount of memory used or to change it.
To generate coverage report:
$ bin/test.sh --coverage
To view coverage report, open ./hpc_index.html
in browser.
See bin/test.sh --help
for more info.
Building and Running Tests using cabal
Build a single test
$ cabal build test:Prelude.Serial
or:
$ cd test; cabal build Prelude.Serial
Build with optimizations:
$ cabal build --flag opt ...
Build all tests
$ cabal build --enable-tests all
or:
$ cd test; cabal build --enable-tests
Or this, note this command does not work as expected when in the "test" dir:
$ cabal build --enable-tests streamly-tests
Build and run
Running all test suites, use any of the following:
$ cabal test all
or:
$ cd test; cabal test
Or this, note this command does not work as expected when in the "test" dir:
$ cabal test streamly-tests
Build and Run a single test suite
To run Prelude.Serial
test-suite:
$ cabal run test:Prelude.Serial
or:
$ cd test; cabal run Prelude.Serial
Note you could use cabal test Prelude.Serial
but that unfortunately builds
all the test suites before running Prelude.Serial
.
Writing doctests
- The test named
doctest
runs all the code snippets in a source module that are written using the>>>
markup in haddock. Seedoctest.hs
. - Make sure you do not enclose your snippets in the
@ .. @
markup otherwise they will show up verbatim in the docs and not as ghci styled snippets. - We use
--fast
mode of doctest, which means snippets are run as if you are typing those examples from top to bottom in that order in GHCi. Previous snippet's state is available to the next one. - A haddock section named
$setup
contains a snippet that is always run before any other. When--fast
mode is not used it is run before every snippet.
An example setup section:
-- $setup
-- >>> :m
-- >>> import Control.Monad.IO.Class (MonadIO(..))
-- >>> import Data.Function ((&))
Some tests that may take long can be written as follows. Just assigning the code to a function makes it compile but not run.
>>> :{
main = do
Stream.drain $ Stream.fromAsync $ foldMap delay [1..10]
Stream.drain $ Stream.concatFoldableWith Stream.async (map delay [1..10])
Stream.drain $ Stream.concatMapFoldableWith Stream.async delay [1..10]
Stream.drain $ Stream.concatForFoldableWith Stream.async [1..10] delay
:}
Running doctests
Run tests for all modules:
$ cabal run doctests --flag doctests
Use verbose mode to debug:
$ cabal run doctests --flag doctests -- --verbose
Run tests only for selected modules:
$ cabal run doctests --flag doctests -- --modules Streamly.Prelude
If it fails with a message that a particular modules is not loaded specify that module as well on the command line.
Naming of test modules
Tests are organized by source modules. For example, for the source
module Streamly.Data.Array
and Streamly.Internal.Data.Array
we have
a test module Data.Array
. For some modules tests for a source module
are broken into multiple modules. For example, for Streamly.Prelude
we have
Streamly.Prelude.Serial
, Streamly.Prelude.Async
etc.