diff --git a/src/Building/UnixBuild.php b/src/Building/UnixBuild.php
index 6e7c994..77f680d 100644
--- a/src/Building/UnixBuild.php
+++ b/src/Building/UnixBuild.php
@@ -23,6 +23,7 @@ final class UnixBuild implements Build
     private const PHPIZE_TIMEOUT_SECS    = 60; // 1 minute
     private const CONFIGURE_TIMEOUT_SECS = 120; // 2 minutes
     private const MAKE_TIMEOUT_SECS      = null; // unlimited
+    private const EMPTY_STRING_SHA256    = 'e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855';
 
     /** {@inheritDoc} */
     public function __invoke(
@@ -60,6 +61,7 @@ public function __invoke(
             $downloadedPackage,
             $output,
             $outputCallback,
+            $targetPlatform->dryRun,
         );
 
         $output->writeln('<info>phpize complete</info>.');
@@ -69,17 +71,31 @@ public function __invoke(
             $configureOptions[] = '--with-php-config=' . $phpConfigPath;
         }
 
-        $this->configure($downloadedPackage, $configureOptions, $output, $outputCallback);
+        $this->configure(
+            $downloadedPackage,
+            $configureOptions,
+            $output,
+            $outputCallback,
+            $targetPlatform->dryRun,
+        );
 
         $optionsOutput = count($configureOptions) ? ' with options: ' . implode(' ', $configureOptions) : '.';
         $output->writeln('<info>Configure complete</info>' . $optionsOutput);
 
-        $this->make($targetPlatform, $downloadedPackage, $output, $outputCallback);
+        $this->make(
+            $targetPlatform,
+            $downloadedPackage,
+            $output,
+            $outputCallback,
+            $targetPlatform->dryRun,
+        );
 
         $expectedSoFile = $downloadedPackage->extractedSourcePath . '/modules/' . $downloadedPackage->package->extensionName->name() . '.so';
 
-        if (! file_exists($expectedSoFile)) {
-            throw ExtensionBinaryNotFound::fromExpectedBinary($expectedSoFile);
+        if (! $targetPlatform->dryRun) {
+            if (! file_exists($expectedSoFile)) {
+                throw ExtensionBinaryNotFound::fromExpectedBinary($expectedSoFile);
+            }
         }
 
         $output->writeln(sprintf(
@@ -87,6 +103,10 @@ public function __invoke(
             $expectedSoFile,
         ));
 
+        if ($targetPlatform->dryRun) {
+            return new BinaryFile($expectedSoFile, self::EMPTY_STRING_SHA256); // sha256 of empty string
+        }
+
         return BinaryFile::fromFileWithSha256Checksum($expectedSoFile);
     }
 
@@ -96,6 +116,7 @@ private function phpize(
         DownloadedPackage $downloadedPackage,
         OutputInterface $output,
         callable|null $outputCallback,
+        bool $dryRun,
     ): void {
         $phpizeCommand = [$phpize->phpizeBinaryPath];
 
@@ -103,6 +124,10 @@ private function phpize(
             $output->writeln('<comment>Running phpize step using: ' . implode(' ', $phpizeCommand) . '</comment>');
         }
 
+        if ($dryRun) {
+            return;
+        }
+
         Process::run(
             $phpizeCommand,
             $downloadedPackage->extractedSourcePath,
@@ -120,6 +145,7 @@ private function configure(
         array $configureOptions,
         OutputInterface $output,
         callable|null $outputCallback,
+        bool $dryRun,
     ): void {
         $configureCommand = ['./configure', ...$configureOptions];
 
@@ -127,6 +153,10 @@ private function configure(
             $output->writeln('<comment>Running configure step with: ' . implode(' ', $configureCommand) . '</comment>');
         }
 
+        if ($dryRun) {
+            return;
+        }
+
         Process::run(
             $configureCommand,
             $downloadedPackage->extractedSourcePath,
@@ -141,6 +171,7 @@ private function make(
         DownloadedPackage $downloadedPackage,
         OutputInterface $output,
         callable|null $outputCallback,
+        bool $dryRun,
     ): void {
         $makeCommand = ['make'];
 
@@ -154,6 +185,10 @@ private function make(
             $output->writeln('<comment>Running make step with: ' . implode(' ', $makeCommand) . '</comment>');
         }
 
+        if ($dryRun) {
+            return;
+        }
+
         Process::run(
             $makeCommand,
             $downloadedPackage->extractedSourcePath,
diff --git a/src/Command/BuildCommand.php b/src/Command/BuildCommand.php
index 46bd27e..d4e2827 100644
--- a/src/Command/BuildCommand.php
+++ b/src/Command/BuildCommand.php
@@ -37,6 +37,7 @@ public function configure(): void
         parent::configure();
 
         CommandHelper::configureDownloadBuildInstallOptions($this);
+        CommandHelper::configureDryRunOption($this);
     }
 
     public function execute(InputInterface $input, OutputInterface $output): int
diff --git a/src/Command/CommandHelper.php b/src/Command/CommandHelper.php
index 68b55d2..6303d3d 100644
--- a/src/Command/CommandHelper.php
+++ b/src/Command/CommandHelper.php
@@ -38,6 +38,7 @@ final class CommandHelper
     private const OPTION_WITH_PHP_PATH              = 'with-php-path';
     private const OPTION_WITH_PHPIZE_PATH           = 'with-phpize-path';
     private const OPTION_MAKE_PARALLEL_JOBS         = 'make-parallel-jobs';
+    private const OPTION_DRY_RUN                    = 'dry-run';
 
     /** @psalm-suppress UnusedConstructor */
     private function __construct()
@@ -89,6 +90,16 @@ public static function configureDownloadBuildInstallOptions(Command $command): v
         $command->ignoreValidationErrors();
     }
 
+    public static function configureDryRunOption(Command $command): void
+    {
+        $command->addOption(
+            self::OPTION_DRY_RUN,
+            null,
+            InputOption::VALUE_NONE,
+            'Do not actually build or install the extension, just show the steps that would be run.',
+        );
+    }
+
     public static function validateInput(InputInterface $input, Command $command): void
     {
         $input->bind($command->getDefinition());
@@ -138,7 +149,12 @@ public static function determineTargetPlatformFromInputs(InputInterface $input,
             }
         }
 
-        $targetPlatform = TargetPlatform::fromPhpBinaryPath($phpBinaryPath, $makeParallelJobs);
+        $dryRun = false;
+        if ($input->hasOption(self::OPTION_DRY_RUN)) {
+            $dryRun = (bool) $input->getOption(self::OPTION_DRY_RUN);
+        }
+
+        $targetPlatform = TargetPlatform::fromPhpBinaryPath($phpBinaryPath, $makeParallelJobs, $dryRun);
 
         $output->writeln(sprintf('<info>You are running PHP %s</info>', PHP_VERSION));
         $output->writeln(sprintf(
diff --git a/src/Command/InstallCommand.php b/src/Command/InstallCommand.php
index ca29316..c8fb771 100644
--- a/src/Command/InstallCommand.php
+++ b/src/Command/InstallCommand.php
@@ -38,6 +38,7 @@ public function configure(): void
         parent::configure();
 
         CommandHelper::configureDownloadBuildInstallOptions($this);
+        CommandHelper::configureDryRunOption($this);
     }
 
     public function execute(InputInterface $input, OutputInterface $output): int
diff --git a/src/Installing/UnixInstall.php b/src/Installing/UnixInstall.php
index 6411e6b..6b47cb6 100644
--- a/src/Installing/UnixInstall.php
+++ b/src/Installing/UnixInstall.php
@@ -21,6 +21,7 @@
 final class UnixInstall implements Install
 {
     private const MAKE_INSTALL_TIMEOUT_SECS = 60; // 1 minute
+    private const EMPTY_STRING_SHA256       = 'e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855';
 
     public function __invoke(DownloadedPackage $downloadedPackage, TargetPlatform $targetPlatform, OutputInterface $output): BinaryFile
     {
@@ -47,18 +48,20 @@ public function __invoke(DownloadedPackage $downloadedPackage, TargetPlatform $t
             array_unshift($makeInstallCommand, 'sudo');
         }
 
-        $makeInstallOutput = Process::run(
-            $makeInstallCommand,
-            $downloadedPackage->extractedSourcePath,
-            self::MAKE_INSTALL_TIMEOUT_SECS,
-        );
+        if (! $targetPlatform->dryRun) {
+            $makeInstallOutput = Process::run(
+                $makeInstallCommand,
+                $downloadedPackage->extractedSourcePath,
+                self::MAKE_INSTALL_TIMEOUT_SECS,
+            );
 
-        if ($output->isVeryVerbose()) {
-            $output->writeln($makeInstallOutput);
-        }
+            if ($output->isVeryVerbose()) {
+                $output->writeln($makeInstallOutput);
+            }
 
-        if (! file_exists($expectedSharedObjectLocation)) {
-            throw new RuntimeException('Install failed, ' . $expectedSharedObjectLocation . ' was not installed.');
+            if (! file_exists($expectedSharedObjectLocation)) {
+                throw new RuntimeException('Install failed, ' . $expectedSharedObjectLocation . ' was not installed.');
+            }
         }
 
         $output->writeln('<info>Install complete:</info> ' . $expectedSharedObjectLocation);
@@ -74,6 +77,10 @@ public function __invoke(DownloadedPackage $downloadedPackage, TargetPlatform $t
             $downloadedPackage->package->extensionName->name(),
         ));
 
+        if ($targetPlatform->dryRun) {
+            return new BinaryFile($expectedSharedObjectLocation, self::EMPTY_STRING_SHA256);
+        }
+
         return BinaryFile::fromFileWithSha256Checksum($expectedSharedObjectLocation);
     }
 }
diff --git a/src/Installing/WindowsInstall.php b/src/Installing/WindowsInstall.php
index a9f6c3c..de3b267 100644
--- a/src/Installing/WindowsInstall.php
+++ b/src/Installing/WindowsInstall.php
@@ -31,6 +31,8 @@
 /** @internal This is not public API for PIE, so should not be depended upon unless you accept the risk of BC breaks */
 final class WindowsInstall implements Install
 {
+    private const EMPTY_STRING_SHA256 = 'e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855';
+
     public function __invoke(DownloadedPackage $downloadedPackage, TargetPlatform $targetPlatform, OutputInterface $output): BinaryFile
     {
         $extractedSourcePath = $downloadedPackage->extractedSourcePath;
@@ -82,6 +84,10 @@ public function __invoke(DownloadedPackage $downloadedPackage, TargetPlatform $t
             $downloadedPackage->package->extensionName->name(),
         ));
 
+        if ($targetPlatform->dryRun) {
+            return new BinaryFile($destinationDllName, self::EMPTY_STRING_SHA256);
+        }
+
         return BinaryFile::fromFileWithSha256Checksum($destinationDllName);
     }
 
@@ -106,6 +112,10 @@ private function copyExtensionDll(TargetPlatform $targetPlatform, DownloadedPack
         $destinationDllName = $targetPlatform->phpBinaryPath->extensionPath() . DIRECTORY_SEPARATOR
             . 'php_' . $downloadedPackage->package->extensionName->name() . '.dll';
 
+        if ($targetPlatform->dryRun) {
+            return $destinationDllName;
+        }
+
         if (! copy($sourceDllName, $destinationDllName) || ! file_exists($destinationDllName) && ! is_file($destinationDllName)) {
             throw new RuntimeException('Failed to install DLL to ' . $destinationDllName);
         }
@@ -133,6 +143,10 @@ private function copyExtensionPdb(TargetPlatform $targetPlatform, DownloadedPack
         $destinationPdbName = str_replace('.dll', '.pdb', $destinationDllName);
         assert($destinationPdbName !== '');
 
+        if ($targetPlatform->dryRun) {
+            return $destinationPdbName;
+        }
+
         if (! copy($sourcePdbName, $destinationPdbName) || ! file_exists($destinationPdbName) && ! is_file($destinationPdbName)) {
             throw new RuntimeException('Failed to install PDB to ' . $destinationPdbName);
         }
@@ -156,6 +170,10 @@ private function copyDependencyDll(TargetPlatform $targetPlatform, SplFileInfo $
 
         $destinationExtraDll = dirname($targetPlatform->phpBinaryPath->phpBinaryPath) . DIRECTORY_SEPARATOR . $file->getFilename();
 
+        if ($targetPlatform->dryRun) {
+            return $destinationExtraDll;
+        }
+
         if (! copy($file->getPathname(), $destinationExtraDll) || ! file_exists($destinationExtraDll) && ! is_file($destinationExtraDll)) {
             throw new RuntimeException('Failed to copy to ' . $destinationExtraDll);
         }
@@ -177,6 +195,10 @@ private function copyExtraFile(TargetPlatform $targetPlatform, DownloadedPackage
 
         $destinationPath = dirname($destinationFullFilename);
 
+        if ($targetPlatform->dryRun) {
+            return $destinationFullFilename;
+        }
+
         if (! file_exists($destinationPath)) {
             mkdir($destinationPath, 0777, true);
         }
diff --git a/src/Platform/TargetPlatform.php b/src/Platform/TargetPlatform.php
index 5da75bb..3724e06 100644
--- a/src/Platform/TargetPlatform.php
+++ b/src/Platform/TargetPlatform.php
@@ -28,6 +28,7 @@ public function __construct(
         public readonly ThreadSafetyMode $threadSafety,
         public readonly int $makeParallelJobs,
         public readonly WindowsCompiler|null $windowsCompiler,
+        public readonly bool $dryRun,
     ) {
     }
 
@@ -36,7 +37,7 @@ public static function isRunningAsRoot(): bool
         return function_exists('posix_getuid') && posix_getuid() === 0;
     }
 
-    public static function fromPhpBinaryPath(PhpBinaryPath $phpBinaryPath, int|null $makeParallelJobs): self
+    public static function fromPhpBinaryPath(PhpBinaryPath $phpBinaryPath, int|null $makeParallelJobs, bool $dryRun): self
     {
         $os = $phpBinaryPath->operatingSystem();
 
@@ -119,6 +120,7 @@ public static function fromPhpBinaryPath(PhpBinaryPath $phpBinaryPath, int|null
             $threadSafety,
             $makeParallelJobs,
             $windowsCompiler,
+            $dryRun,
         );
     }
 }
diff --git a/test/integration/Building/UnixBuildTest.php b/test/integration/Building/UnixBuildTest.php
index 41bffb7..ba7a757 100644
--- a/test/integration/Building/UnixBuildTest.php
+++ b/test/integration/Building/UnixBuildTest.php
@@ -55,7 +55,7 @@ public function testUnixBuildCanBuildExtension(): void
         $unixBuilder = new UnixBuild();
         $builtBinary = $unixBuilder->__invoke(
             $downloadedPackage,
-            TargetPlatform::fromPhpBinaryPath(PhpBinaryPath::fromCurrentProcess(), null),
+            TargetPlatform::fromPhpBinaryPath(PhpBinaryPath::fromCurrentProcess(), null, false),
             ['--enable-pie_test_ext'],
             $output,
             null,
@@ -111,7 +111,7 @@ public function testUnixBuildWillThrowExceptionWhenExpectedBinaryNameMismatches(
         try {
             $unixBuilder->__invoke(
                 $downloadedPackage,
-                TargetPlatform::fromPhpBinaryPath(PhpBinaryPath::fromCurrentProcess(), null),
+                TargetPlatform::fromPhpBinaryPath(PhpBinaryPath::fromCurrentProcess(), null, false),
                 ['--enable-pie_test_ext'],
                 $output,
                 null,
@@ -149,7 +149,7 @@ public function testUnixBuildCanBuildExtensionWithBuildPath(): void
         $unixBuilder = new UnixBuild();
         $builtBinary = $unixBuilder->__invoke(
             $downloadedPackage,
-            TargetPlatform::fromPhpBinaryPath(PhpBinaryPath::fromCurrentProcess(), null),
+            TargetPlatform::fromPhpBinaryPath(PhpBinaryPath::fromCurrentProcess(), null, false),
             ['--enable-pie_test_ext'],
             $output,
             null,
@@ -206,7 +206,7 @@ public function testCleanupDoesNotCleanWhenConfigureIsMissing(): void
         $unixBuilder = new UnixBuild();
         $unixBuilder->__invoke(
             $downloadedPackage,
-            TargetPlatform::fromPhpBinaryPath(PhpBinaryPath::fromCurrentProcess(), null),
+            TargetPlatform::fromPhpBinaryPath(PhpBinaryPath::fromCurrentProcess(), null, false),
             ['--enable-pie_test_ext'],
             $output,
             null,
@@ -248,7 +248,7 @@ public function testVerboseOutputShowsCleanupMessages(): void
         $unixBuilder = new UnixBuild();
         $unixBuilder->__invoke(
             $downloadedPackage,
-            TargetPlatform::fromPhpBinaryPath(PhpBinaryPath::fromCurrentProcess(), null),
+            TargetPlatform::fromPhpBinaryPath(PhpBinaryPath::fromCurrentProcess(), null, false),
             ['--enable-pie_test_ext'],
             $output,
             null,
diff --git a/test/integration/DependencyResolver/ResolveDependencyWithComposerTest.php b/test/integration/DependencyResolver/ResolveDependencyWithComposerTest.php
index c708dff..5f4c9ca 100644
--- a/test/integration/DependencyResolver/ResolveDependencyWithComposerTest.php
+++ b/test/integration/DependencyResolver/ResolveDependencyWithComposerTest.php
@@ -74,7 +74,7 @@ public function testDependenciesAreResolvedToExpectedVersions(
         $container = Container::factory();
         $resolve   = $container->get(DependencyResolver::class);
 
-        $targetPlatform             = TargetPlatform::fromPhpBinaryPath(PhpBinaryPath::fromCurrentProcess(), null);
+        $targetPlatform             = TargetPlatform::fromPhpBinaryPath(PhpBinaryPath::fromCurrentProcess(), null, false);
         $requestedPackageAndVersion = new RequestedPackageAndVersion(
             'asgrim/example-pie-extension',
             $requestedVersion,
diff --git a/test/integration/Downloading/GithubPackageReleaseAssetsTest.php b/test/integration/Downloading/GithubPackageReleaseAssetsTest.php
index 4a1ca2f..eb68c97 100644
--- a/test/integration/Downloading/GithubPackageReleaseAssetsTest.php
+++ b/test/integration/Downloading/GithubPackageReleaseAssetsTest.php
@@ -39,6 +39,7 @@ public function testDeterminingReleaseAssetUrlForWindows(): void
             ThreadSafetyMode::ThreadSafe,
             1,
             WindowsCompiler::VS16,
+            false,
         );
 
         $package = new Package(
diff --git a/test/integration/Installing/UnixInstallTest.php b/test/integration/Installing/UnixInstallTest.php
index 5bf7bb9..8c4fa41 100644
--- a/test/integration/Installing/UnixInstallTest.php
+++ b/test/integration/Installing/UnixInstallTest.php
@@ -76,7 +76,7 @@ public function testUnixInstallCanInstallExtension(string $phpConfig): void
         }
 
         $output         = new BufferedOutput();
-        $targetPlatform = TargetPlatform::fromPhpBinaryPath(PhpBinaryPath::fromPhpConfigExecutable($phpConfig), null);
+        $targetPlatform = TargetPlatform::fromPhpBinaryPath(PhpBinaryPath::fromPhpConfigExecutable($phpConfig), null, false);
         $extensionPath  = $targetPlatform->phpBinaryPath->extensionPath();
 
         $downloadedPackage = DownloadedPackage::fromPackageAndExtractedPath(
@@ -125,4 +125,54 @@ public function testUnixInstallCanInstallExtension(string $phpConfig): void
         (new Process(['make', 'clean'], $downloadedPackage->extractedSourcePath))->mustRun();
         (new Process(['phpize', '--clean'], $downloadedPackage->extractedSourcePath))->mustRun();
     }
+
+    #[DataProvider('phpPathProvider')]
+    public function testUnixInstallCanInstallExtensionWithDryRun(string $phpConfig): void
+    {
+        assert($phpConfig !== '');
+        if (Platform::isWindows()) {
+            self::markTestSkipped('Unix build test cannot be run on Windows');
+        }
+
+        $output         = new BufferedOutput();
+        $targetPlatform = TargetPlatform::fromPhpBinaryPath(PhpBinaryPath::fromPhpConfigExecutable($phpConfig), null, true);
+        $extensionPath  = $targetPlatform->phpBinaryPath->extensionPath();
+
+        $downloadedPackage = DownloadedPackage::fromPackageAndExtractedPath(
+            new Package(
+                $this->createMock(CompletePackage::class),
+                ExtensionType::PhpModule,
+                ExtensionName::normaliseFromString('pie_test_ext'),
+                'pie_test_ext',
+                '0.1.0',
+                null,
+                [ConfigureOption::fromComposerJsonDefinition(['name' => 'enable-pie_test_ext'])],
+                true,
+                true,
+                null,
+            ),
+            self::TEST_EXTENSION_PATH,
+        );
+
+        (new UnixBuild())->__invoke(
+            $downloadedPackage,
+            $targetPlatform,
+            ['--enable-pie_test_ext'],
+            $output,
+            null,
+        );
+
+        $installedSharedObject = (new UnixInstall())->__invoke(
+            $downloadedPackage,
+            $targetPlatform,
+            $output,
+        );
+        $outputString          = $output->fetch();
+
+        self::assertStringContainsString('Install complete: ' . $extensionPath . '/pie_test_ext.so', $outputString);
+        self::assertStringContainsString('You must now add "extension=pie_test_ext" to your php.ini', $outputString);
+
+        self::assertSame($extensionPath . '/pie_test_ext.so', $installedSharedObject->filePath);
+        self::assertFileDoesNotExist($installedSharedObject->filePath);
+    }
 }
diff --git a/test/integration/Installing/WindowsInstallTest.php b/test/integration/Installing/WindowsInstallTest.php
index 0905fa9..f333e97 100644
--- a/test/integration/Installing/WindowsInstallTest.php
+++ b/test/integration/Installing/WindowsInstallTest.php
@@ -65,6 +65,7 @@ public function testWindowsInstallCanInstallExtension(): void
             ThreadSafetyMode::ThreadSafe,
             1,
             WindowsCompiler::VS16,
+            false,
         );
         $phpPath           = dirname($targetPlatform->phpBinaryPath->phpBinaryPath);
         $extensionPath     = $targetPlatform->phpBinaryPath->extensionPath();
@@ -99,6 +100,62 @@ public function testWindowsInstallCanInstallExtension(): void
         $this->delete($extrasDirectory);
     }
 
+    #[RequiresOperatingSystemFamily('Windows')]
+    public function testWindowsInstallCanInstallExtensionWithDryRun(): void
+    {
+        $downloadedPackage = DownloadedPackage::fromPackageAndExtractedPath(
+            new Package(
+                $this->createMock(CompletePackage::class),
+                ExtensionType::PhpModule,
+                ExtensionName::normaliseFromString('pie_test_ext'),
+                'php/pie-test-ext',
+                '1.2.3',
+                null,
+                [],
+                true,
+                true,
+                null,
+            ),
+            self::TEST_EXTENSION_PATH,
+        );
+        $output            = new BufferedOutput();
+        $targetPlatform    = new TargetPlatform(
+            OperatingSystem::Windows,
+            PhpBinaryPath::fromCurrentProcess(),
+            Architecture::x86_64,
+            ThreadSafetyMode::ThreadSafe,
+            1,
+            WindowsCompiler::VS16,
+            true,
+        );
+        $phpPath           = dirname($targetPlatform->phpBinaryPath->phpBinaryPath);
+        $extensionPath     = $targetPlatform->phpBinaryPath->extensionPath();
+
+        $installer = new WindowsInstall();
+
+        $installedDll = $installer->__invoke($downloadedPackage, $targetPlatform, $output);
+        self::assertSame($extensionPath . '\php_pie_test_ext.dll', $installedDll->filePath);
+
+        $outputString = $output->fetch();
+
+        self::assertStringContainsString('Copied DLL to: ' . $extensionPath . '\php_pie_test_ext.dll', $outputString);
+        self::assertStringContainsString('You must now add "extension=pie_test_ext" to your php.ini', $outputString);
+
+        $extrasDirectory = $phpPath . DIRECTORY_SEPARATOR . 'extras' . DIRECTORY_SEPARATOR . 'pie_test_ext';
+
+        $expectedPdb                 = str_replace('.dll', '.pdb', $installedDll->filePath);
+        $expectedSupportingDll       = $phpPath . DIRECTORY_SEPARATOR . 'supporting-library.dll';
+        $expectedSupportingOtherFile = $extrasDirectory . DIRECTORY_SEPARATOR . 'README.md';
+        $expectedSubdirectoryFile    = $extrasDirectory . DIRECTORY_SEPARATOR . 'more' . DIRECTORY_SEPARATOR . 'more-information.txt';
+        assert($expectedPdb !== '');
+
+        self::assertFileDoesNotExist($installedDll->filePath);
+        self::assertFileDoesNotExist($expectedPdb);
+        self::assertFileDoesNotExist($expectedSupportingDll);
+        self::assertFileDoesNotExist($expectedSupportingOtherFile);
+        self::assertFileDoesNotExist($expectedSubdirectoryFile);
+    }
+
     /**
      * Recursively remove a file/path to clean up after testing
      *
diff --git a/test/unit/ComposerIntegration/InstallAndBuildProcessTest.php b/test/unit/ComposerIntegration/InstallAndBuildProcessTest.php
index c8ff3cc..a39265a 100644
--- a/test/unit/ComposerIntegration/InstallAndBuildProcessTest.php
+++ b/test/unit/ComposerIntegration/InstallAndBuildProcessTest.php
@@ -61,6 +61,7 @@ public function testDownloadWithoutBuildAndInstall(): void
                 ThreadSafetyMode::NonThreadSafe,
                 1,
                 null,
+                false,
             ),
             new RequestedPackageAndVersion('foo/bar', '^1.0'),
             PieOperation::Download,
@@ -101,6 +102,7 @@ public function testDownloadAndBuildWithoutInstall(): void
                 ThreadSafetyMode::NonThreadSafe,
                 1,
                 null,
+                false,
             ),
             new RequestedPackageAndVersion('foo/bar', '^1.0'),
             PieOperation::Build,
@@ -144,6 +146,7 @@ public function testDownloadBuildAndInstall(): void
                 ThreadSafetyMode::NonThreadSafe,
                 1,
                 null,
+                false,
             ),
             new RequestedPackageAndVersion('foo/bar', '^1.0'),
             PieOperation::Install,
diff --git a/test/unit/ComposerIntegration/InstalledJsonMetadataTest.php b/test/unit/ComposerIntegration/InstalledJsonMetadataTest.php
index 93a0672..4e920dc 100644
--- a/test/unit/ComposerIntegration/InstalledJsonMetadataTest.php
+++ b/test/unit/ComposerIntegration/InstalledJsonMetadataTest.php
@@ -57,6 +57,7 @@ public function testMetadataForDownloads(): void
                     ThreadSafetyMode::NonThreadSafe,
                     1,
                     null,
+                    false,
                 ),
                 new RequestedPackageAndVersion('foo/bar', '^1.0'),
                 PieOperation::Build,
@@ -94,6 +95,7 @@ public function testMetadataForBuilds(): void
                     ThreadSafetyMode::NonThreadSafe,
                     1,
                     null,
+                    false,
                 ),
                 new RequestedPackageAndVersion('foo/bar', '^1.0'),
                 PieOperation::Build,
diff --git a/test/unit/ComposerIntegration/OverrideWindowsUrlInstallListenerTest.php b/test/unit/ComposerIntegration/OverrideWindowsUrlInstallListenerTest.php
index 233566c..fde999b 100644
--- a/test/unit/ComposerIntegration/OverrideWindowsUrlInstallListenerTest.php
+++ b/test/unit/ComposerIntegration/OverrideWindowsUrlInstallListenerTest.php
@@ -73,6 +73,7 @@ public function testEventListenerRegistration(): void
                     ThreadSafetyMode::NonThreadSafe,
                     1,
                     WindowsCompiler::VC15,
+                    false,
                 ),
                 new RequestedPackageAndVersion('foo/bar', '^1.1'),
                 PieOperation::Install,
@@ -117,6 +118,7 @@ public function testWindowsUrlInstallerDoesNotRunOnNonWindows(): void
                     ThreadSafetyMode::NonThreadSafe,
                     1,
                     WindowsCompiler::VC15,
+                    false,
                 ),
                 new RequestedPackageAndVersion('foo/bar', '^1.1'),
                 PieOperation::Install,
@@ -173,6 +175,7 @@ public function testDistUrlIsUpdatedForWindowsInstallers(): void
                     ThreadSafetyMode::NonThreadSafe,
                     1,
                     WindowsCompiler::VC15,
+                    false,
                 ),
                 new RequestedPackageAndVersion('foo/bar', '^1.1'),
                 PieOperation::Install,
diff --git a/test/unit/ComposerIntegration/VersionSelectorFactoryTest.php b/test/unit/ComposerIntegration/VersionSelectorFactoryTest.php
index c513dd0..4254b32 100644
--- a/test/unit/ComposerIntegration/VersionSelectorFactoryTest.php
+++ b/test/unit/ComposerIntegration/VersionSelectorFactoryTest.php
@@ -51,6 +51,7 @@ public function testVersionSelectorFactory(): void
                 ThreadSafetyMode::NonThreadSafe,
                 1,
                 null,
+                false,
             ),
         );
 
diff --git a/test/unit/DependencyResolver/ResolveDependencyWithComposerTest.php b/test/unit/DependencyResolver/ResolveDependencyWithComposerTest.php
index b0fe20a..4e4237d 100644
--- a/test/unit/DependencyResolver/ResolveDependencyWithComposerTest.php
+++ b/test/unit/DependencyResolver/ResolveDependencyWithComposerTest.php
@@ -57,6 +57,7 @@ public function testPackageThatCanBeResolved(): void
             ThreadSafetyMode::ThreadSafe,
             1,
             null,
+            false,
         );
 
         $package = (new ResolveDependencyWithComposer(
@@ -101,6 +102,7 @@ public function testPackageThatCannotBeResolvedThrowsException(array $platformOv
             ThreadSafetyMode::ThreadSafe,
             1,
             null,
+            false,
         );
 
         $this->expectException(UnableToResolveRequirement::class);
@@ -146,6 +148,7 @@ public function testZtsOnlyPackageCannotBeInstalledOnNtsSystem(): void
             ThreadSafetyMode::NonThreadSafe,
             1,
             null,
+            false,
         );
 
         $this->expectException(IncompatibleThreadSafetyMode::class);
@@ -191,6 +194,7 @@ public function testNtsOnlyPackageCannotBeInstalledOnZtsSystem(): void
             ThreadSafetyMode::ThreadSafe,
             1,
             null,
+            false,
         );
 
         $this->expectException(IncompatibleThreadSafetyMode::class);
diff --git a/test/unit/Downloading/Exception/CouldNotFindReleaseAssetTest.php b/test/unit/Downloading/Exception/CouldNotFindReleaseAssetTest.php
index 64ba9d0..00fd60e 100644
--- a/test/unit/Downloading/Exception/CouldNotFindReleaseAssetTest.php
+++ b/test/unit/Downloading/Exception/CouldNotFindReleaseAssetTest.php
@@ -70,6 +70,7 @@ public function testForMissingWindowsCompiler(): void
             ThreadSafetyMode::NonThreadSafe,
             1,
             null,
+            false,
         ));
 
         self::assertSame('Could not determine Windows Compiler for PHP ' . $phpBinary->version() . ' on NonWindows', $exception->getMessage());
diff --git a/test/unit/Downloading/GithubPackageReleaseAssetsTest.php b/test/unit/Downloading/GithubPackageReleaseAssetsTest.php
index 846b507..db0e052 100644
--- a/test/unit/Downloading/GithubPackageReleaseAssetsTest.php
+++ b/test/unit/Downloading/GithubPackageReleaseAssetsTest.php
@@ -42,6 +42,7 @@ public function testUrlIsReturnedWhenFindingWindowsDownloadUrl(): void
             ThreadSafetyMode::ThreadSafe,
             1,
             WindowsCompiler::VC14,
+            false,
         );
 
         $authHelper = $this->createMock(AuthHelper::class);
@@ -101,6 +102,7 @@ public function testUrlIsReturnedWhenFindingWindowsDownloadUrlWithCompilerAndThr
             ThreadSafetyMode::ThreadSafe,
             1,
             WindowsCompiler::VC14,
+            false,
         );
 
         $authHelper = $this->createMock(AuthHelper::class);
@@ -155,6 +157,7 @@ public function testFindWindowsDownloadUrlForPackageThrowsExceptionWhenAssetNotF
             ThreadSafetyMode::ThreadSafe,
             1,
             WindowsCompiler::VC14,
+            false,
         );
 
         $authHelper = $this->createMock(AuthHelper::class);
diff --git a/test/unit/Platform/TargetPlatformTest.php b/test/unit/Platform/TargetPlatformTest.php
index fe588c2..3db777c 100644
--- a/test/unit/Platform/TargetPlatformTest.php
+++ b/test/unit/Platform/TargetPlatformTest.php
@@ -50,7 +50,7 @@ public function testWindowsPlatformFromPhpInfo(): void
 PHP Extension Build => API20230831,TS,VS16
 TEXT);
 
-        $platform = TargetPlatform::fromPhpBinaryPath($phpBinaryPath, null);
+        $platform = TargetPlatform::fromPhpBinaryPath($phpBinaryPath, null, false);
 
         self::assertSame(OperatingSystem::Windows, $platform->operatingSystem);
         self::assertSame(WindowsCompiler::VS16, $platform->windowsCompiler);
@@ -91,7 +91,7 @@ public function testLinuxPlatform(): void
 Thread Safety => disabled
 TEXT);
 
-        $platform = TargetPlatform::fromPhpBinaryPath($phpBinaryPath, null);
+        $platform = TargetPlatform::fromPhpBinaryPath($phpBinaryPath, null, false);
 
         self::assertSame(OperatingSystem::NonWindows, $platform->operatingSystem);
         self::assertNull($platform->windowsCompiler);
diff --git a/test/unit/Platform/WindowsExtensionAssetNameTest.php b/test/unit/Platform/WindowsExtensionAssetNameTest.php
index 8f10040..44e587b 100644
--- a/test/unit/Platform/WindowsExtensionAssetNameTest.php
+++ b/test/unit/Platform/WindowsExtensionAssetNameTest.php
@@ -36,6 +36,7 @@ public function setUp(): void
             ThreadSafetyMode::ThreadSafe,
             1,
             WindowsCompiler::VC14,
+            false,
         );
 
         $this->phpVersion = $this->platform->phpBinaryPath->majorMinorVersion();