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jrfnl 7022ceb0a6 PHP 8.1: prevent a "null to non-nullable" deprecation notice (test only fix)
Not all tests in the `InstallerTest` class actually create a temporary directory and set the `$this->tempComposerHome` property.

Those tests which didn't, throw a notice in PHP 8.1.

Fixes 3 notices along the lines of:
```
Deprecation triggered by Composer\Test\InstallerTest::tearDown:
is_dir(): Passing null to parameter #1 ($filename) of type string is deprecated

Stack trace:
0 [internal function]: Symfony\Bridge\PhpUnit\DeprecationErrorHandler->handleError(8192, '...', '...', 53)
1 tests/Composer/Test/InstallerTest.php(53): is_dir(NULL)
...
```
3 years ago
..
Composer/Test PHP 8.1: prevent a "null to non-nullable" deprecation notice (test only fix) 3 years ago
bootstrap.php Allow querying InstalledVersions::isInstalled() for no-dev packages 3 years ago
complete.phpunit.xml Build tweaks 4 years ago