fix(tests): Update exception usage to ensure proper namespace references in test files.

Author: terabytesoftw

tests/Fallback/ComposerFallbackTest.php

@@ -166,7 +166,6 @@ protected function setUp(): void
         $this->io = $this->createMock(IOInterface::class);
         $this->input = $this->createMock(InputInterface::class);
         $this->fs = $this->createMock(Filesystem::class);
-        /** @var Installer|MockObject $this */
         $this->installer = $this
             ->getMockBuilder(Installer::class)
             ->disableOriginalConstructor()

tests/Fixtures/Asset/StubAssetManager.php

@@ -9,8 +9,8 @@
 use Composer\Util\{Filesystem, ProcessExecutor};
 use Foxy\Asset\{AssetManagerInterface, AssetPackageInterface};
 use Foxy\Config\Config;
+use Foxy\Exception\RuntimeException;
 use Foxy\Fallback\FallbackInterface;
-use RuntimeException;
 
 final class StubAssetManager implements AssetManagerInterface
 {

tests/Fixtures/Util/ThrowingProcessExecutorMock.php

@@ -5,7 +5,7 @@
 namespace Foxy\Tests\Fixtures\Util;
 
 use Composer\Util\ProcessExecutor;
-use RuntimeException;
+use Foxy\Exception\RuntimeException;
 
 final class ThrowingProcessExecutorMock extends ProcessExecutor
 {