The `LibraryInstallerTest::testUninstall()` method mocks a `Package` object, but did not set an expectation for a call to `getName()`, while that method _is_ called in the `LibraryInstaller::uninstall()` method.
Without expectation, the mock returns `null`, which was subsequently being passed on to `strpos()` leading to the below error.
Fixes:
```
Deprecation triggered by Composer\Test\Installer\LibraryInstallerTest::testUninstall:
strpos(): Passing null to parameter #1 ($haystack) of type string is deprecated
Stack trace:
0 [internal function]: Symfony\Bridge\PhpUnit\DeprecationErrorHandler->handleError(8192, '...', '...', 202)
1 src/Composer/Installer/LibraryInstaller.php(202): strpos(NULL, '...')
2 vendor/react/promise/src/FulfilledPromise.php(28): Composer\Installer\LibraryInstaller->Composer\Installer\{closure}(NULL)
3 src/Composer/Installer/LibraryInstaller.php(208): React\Promise\FulfilledPromise->then(Object(Closure))
4 tests/Composer/Test/Installer/LibraryInstallerTest.php(221): Composer\Installer\LibraryInstaller->uninstall(Object(Mock_InstalledRepositoryInterface_e3699f95), Object(Mock_Package_e4571076))
...
```
This also changes the PRE/POST_PACKAGE_INSTALL/UPDATE/UNINSTALL events to have less information available on them, repositorySet, request and policy are gone
Breaking change for the plugin interface so bumping the version of
composer-plugin-api to 2.0.0
First step for a refactoring of the package metadata loading mechanism
The functionality to install binaries might be useful
for other installers.
Create API for that by extracting this functionality from
the LibraryInstaller class.
any tests that use the filesystem should have their own unique directory, as we run our test suite in parallel and
cleanup of tests (removing directories) should not interfere with currently running tests
Jordi Boggiano
megubyte
jrfnl
Ion Bazan
Gabriel Caruso
Nils Adermann
Théo FIDRY
Alexander M. Turek
Jeremy Benoist
Helmut Hummel
Haralan Dobrev
Rob Bast
François Pluchino