Summary:
CI mode prevents Jest from automatically writing snapshots, and also
causes obsolete snapshots to be an error instead of a warning. This is
consistent with the behavior on Travis, where the `CI=1` environment
variable is set. It should thus be the default when running `yarn test`
(but not `yarn unit`).
Test Plan:
Add a file `src/foo.test.js`:
```js
// @flow
describe("foo", () => {
it("bar", () => {
expect("baz").toMatchSnapshot();
});
});
```
Note that `yarn test` fails with the message, “new snapshot was not
written”.
Revert this change, then re-run `yarn test`; note that it passes,
writing a snapshot.
Then, reinstate this change and delete `src/foo.test.js`. Note that
running `yarn test` fails, due to an obsolete snapshot. Revert the
change again, and watch `yarn test` pass despite the obsolete snapshot.
Finally, remove the snapshot. :-)
wchargin-branch: test-jest-ci
Summary:
Lots of tests need the output of `yarn backend`. Before this commit,
they tended to create it themselves. This was slow and wasteful, and
also could in principle have race conditions (though in practice usually
tended not to).
This commit updates tests to respect a `SOURCECRED_BIN` environment
variable indicating the path to an existing directory of backend
applications.
Closes#765.
Test Plan:
Running `yarn test --full` passes.
Prepending `echo run >>/tmp/log &&` to the `backend` script in
`package.json` and running `yarn test --full` results in a log file
containing only one line, indicating that the script really is run only
once.
wchargin-branch: deduplicate-backend
Summary:
This commit removes the `config/backend.js` script and replaces it with
a direct invocation of Webpack. This enables us to use command-line
arguments to Webpack, like `--output-path`.
Test Plan:
Note that `rm -rf bin; yarn backend` still works, and that the resulting
applications work (`node bin/sourcecred.js load`). Note that `yarn test`
and `yarn test --full` still work.
wchargin-branch: backend-webpack-direct
Summary:
This simplifies interfaces everywhere.
See also #216, which did the opposite of this as a temporary fix due to
a Babel/Webpack interaction that no longer exists as of #766.
Test Plan:
Note that `node bin/sourcecred.js load sourcecred/example-git` still
works (after `yarn backend`). Note that `yarn test` still works. These
demonstrate that the module works from both a Webpack context and a Node
context. Note that `git grep --name-only execDependencyGraph` yields
exactly those files touched in this commit. Note that `yarn test --full`
passes.
wchargin-branch: commonjs-execDependencyGraph
Summary:
We will shortly want to perform testing of shell scripts; it makes the
most sense to do so via the shell. We could roll our own testing
framework, but it makes more sense to use an existing one. By choosing
Sharness, we’re in good company: `go-ipfs` and `go-multihash` use it as
well, and it’s derived from Git’s testing library. I like it a lot.
For now, we need a dummy test file; our test runner will fail if there
are no tests to run. As soon as we have a real test, we can remove this.
This commit was generated by following the “per-project installation”
instructions at https://github.com/chriscool/sharness, and by
additionally including that repository’s `COPYING` file as
`SHARNESS_LICENSE`, with a header prepended. I considered instead adding
Sharness as a submodule, which is supported and has clear advantages
(e.g., you can update the thing), but opted to avoid the complexity of
submodules for now.
Test Plan:
Create the following tests in the `sharness` directory:
```shell
$ cat sharness/good.t
#!/bin/sh
test_description='demo of passing tests'
. ./sharness.sh
test_expect_success "look at me go" true
test_expect_success EXPENSIVE "this may take a while" 'sleep 2'
test_done
# vim: ft=sh
$ cat sharness/bad.t
#!/bin/sh
test_description='demo of failing tests'
. ./sharness.sh
test_expect_success "I don't feel so good" false
test_done
# vim: ft=sh
```
Note that `yarn sharness` and `yarn test` fail appropriately. Note that
`yarn sharness-full` fails appropriately after taking two extra seconds,
and `yarn test --full` runs the latter. Each failure message should
print the name of the failing test case, not just the suite name, and
should indicate that the passing tests passed.
Then, remove `sharness/bad.t`, and note that the above commands all
pass, with the `--full` variants still taking longer.
Finally, remove `sharness/good.t`, and note that the above commands all
pass (and all pass quickly).
wchargin-branch: add-sharness
Summary:
Running `yarn test` (equiv. `npm test` or `npm run test`) now runs all
checks. It takes the place of the former `yarn travis`. This is more in
line with the expectation of a top-level `test` command: if it passes,
your code is good.
The `unit` command now runs Jest once, not in watch mode. It takes the
place of the former `ci-test`. To run tests in watch mode, run any of
the following:
- `yarn unit --watch`, or
- `npm run unit -- --watch`, or
- `npm unit -- --watch`.
This behavior is more consistent with the standard behavior of commands
like `make test`. It is also empirically what @wchargin and
@decentralion want most of the time.
Test Plan:
Verify that each of the scripts `test`, `unit`, and `coverage` passes.
Verify that each of the aforementioned `--watch` invocations works.
Verify that `.travis.yml` has the correct `script:` command.
wchargin-branch: reorganize-test-command
William Chargin