diff --git a/test/unit/ComposerIntegration/Listeners/OverrideDownloadUrlInstallListenerTest.php b/test/unit/ComposerIntegration/Listeners/OverrideDownloadUrlInstallListenerTest.php
index 237cbb6..859bdb9 100644
--- a/test/unit/ComposerIntegration/Listeners/OverrideDownloadUrlInstallListenerTest.php
+++ b/test/unit/ComposerIntegration/Listeners/OverrideDownloadUrlInstallListenerTest.php
@@ -11,6 +11,7 @@
 use Composer\Installer\InstallerEvents;
 use Composer\IO\IOInterface;
 use Composer\Package\CompletePackage;
+use Composer\Package\Package;
 use Php\Pie\ComposerIntegration\Listeners\OverrideDownloadUrlInstallListener;
 use Php\Pie\ComposerIntegration\PieComposerRequest;
 use Php\Pie\ComposerIntegration\PieOperation;
@@ -87,17 +88,140 @@ public function testEventListenerRegistration(): void
 
     public function testNonInstallOperationsAreIgnored(): void
     {
-        self::markTestIncomplete('todo'); // @todo
+        $composerPackage = new CompletePackage('foo/bar', '1.2.3.0', '1.2.3');
+        $composerPackage->setDistUrl('https://example.com/git-archive-zip-url');
+
+        /**
+         * @psalm-suppress InternalClass
+         * @psalm-suppress InternalMethod
+         */
+        $installerEvent = new InstallerEvent(
+            InstallerEvents::PRE_OPERATIONS_EXEC,
+            $this->composer,
+            $this->io,
+            false,
+            true,
+            new Transaction([$composerPackage], []),
+        );
+
+        $this->container
+            ->expects(self::never())
+            ->method('get');
+
+        (new OverrideDownloadUrlInstallListener(
+            $this->composer,
+            $this->io,
+            $this->container,
+            new PieComposerRequest(
+                $this->createMock(OutputInterface::class),
+                new TargetPlatform(
+                    OperatingSystem::NonWindows,
+                    OperatingSystemFamily::Linux,
+                    PhpBinaryPath::fromCurrentProcess(),
+                    Architecture::x86_64,
+                    ThreadSafetyMode::NonThreadSafe,
+                    1,
+                    WindowsCompiler::VC15,
+                ),
+                new RequestedPackageAndVersion('foo/bar', '^1.1'),
+                PieOperation::Install,
+                [],
+                null,
+                false,
+            ),
+        ))($installerEvent);
     }
 
     public function testNonCompletePackagesAreIgnored(): void
     {
-        self::markTestIncomplete('todo'); // @todo
+        $composerPackage = new Package('foo/bar', '1.2.3.0', '1.2.3');
+        $composerPackage->setDistUrl('https://example.com/git-archive-zip-url');
+
+        /**
+         * @psalm-suppress InternalClass
+         * @psalm-suppress InternalMethod
+         */
+        $installerEvent = new InstallerEvent(
+            InstallerEvents::PRE_OPERATIONS_EXEC,
+            $this->composer,
+            $this->io,
+            false,
+            true,
+            new Transaction([], [$composerPackage]),
+        );
+
+        $this->container
+            ->expects(self::never())
+            ->method('get');
+
+        (new OverrideDownloadUrlInstallListener(
+            $this->composer,
+            $this->io,
+            $this->container,
+            new PieComposerRequest(
+                $this->createMock(OutputInterface::class),
+                new TargetPlatform(
+                    OperatingSystem::NonWindows,
+                    OperatingSystemFamily::Linux,
+                    PhpBinaryPath::fromCurrentProcess(),
+                    Architecture::x86_64,
+                    ThreadSafetyMode::NonThreadSafe,
+                    1,
+                    WindowsCompiler::VC15,
+                ),
+                new RequestedPackageAndVersion('foo/bar', '^1.1'),
+                PieOperation::Install,
+                [],
+                null,
+                false,
+            ),
+        ))($installerEvent);
     }
 
     public function testInstallOperationsForDifferentPackagesAreIgnored(): void
     {
-        self::markTestIncomplete('todo'); // @todo
+        $composerPackage = new CompletePackage('different/package', '1.2.3.0', '1.2.3');
+        $composerPackage->setDistUrl('https://example.com/git-archive-zip-url');
+
+        /**
+         * @psalm-suppress InternalClass
+         * @psalm-suppress InternalMethod
+         */
+        $installerEvent = new InstallerEvent(
+            InstallerEvents::PRE_OPERATIONS_EXEC,
+            $this->composer,
+            $this->io,
+            false,
+            true,
+            new Transaction([], [$composerPackage]),
+        );
+
+        $this->container
+            ->expects(self::never())
+            ->method('get');
+
+        (new OverrideDownloadUrlInstallListener(
+            $this->composer,
+            $this->io,
+            $this->container,
+            new PieComposerRequest(
+                $this->createMock(OutputInterface::class),
+                new TargetPlatform(
+                    OperatingSystem::NonWindows,
+                    OperatingSystemFamily::Linux,
+                    PhpBinaryPath::fromCurrentProcess(),
+                    Architecture::x86_64,
+                    ThreadSafetyMode::NonThreadSafe,
+                    1,
+                    WindowsCompiler::VC15,
+                ),
+                new RequestedPackageAndVersion('foo/bar', '^1.1'),
+                PieOperation::Install,
+                [],
+                null,
+                false,
+            ),
+        ))($installerEvent);
     }
 
     public function testWindowsUrlInstallerDoesNotRunOnNonWindows(): void
diff --git a/test/unit/Downloading/DownloadUrlMethodTest.php b/test/unit/Downloading/DownloadUrlMethodTest.php
index 53da6c5..f48b8e8 100644
--- a/test/unit/Downloading/DownloadUrlMethodTest.php
+++ b/test/unit/Downloading/DownloadUrlMethodTest.php
@@ -4,7 +4,19 @@
 
 namespace Php\PieUnitTest\Downloading;
 
+use Composer\Package\CompletePackage;
+use Composer\Package\CompletePackageInterface;
+use Php\Pie\DependencyResolver\Package;
 use Php\Pie\Downloading\DownloadUrlMethod;
+use Php\Pie\ExtensionName;
+use Php\Pie\ExtensionType;
+use Php\Pie\Platform\Architecture;
+use Php\Pie\Platform\OperatingSystem;
+use Php\Pie\Platform\OperatingSystemFamily;
+use Php\Pie\Platform\TargetPhp\PhpBinaryPath;
+use Php\Pie\Platform\TargetPlatform;
+use Php\Pie\Platform\ThreadSafetyMode;
+use Php\Pie\Platform\WindowsCompiler;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\TestCase;
 
@@ -13,16 +25,101 @@ final class DownloadUrlMethodTest extends TestCase
 {
     public function testWindowsPackages(): void
     {
-        self::markTestIncomplete('todo'); // @todo
+        $package = new Package(
+            $this->createMock(CompletePackageInterface::class),
+            ExtensionType::PhpModule,
+            ExtensionName::normaliseFromString('foo'),
+            'foo/foo',
+            '1.2.3',
+            null,
+        );
+
+        $phpBinaryPath = $this->createMock(PhpBinaryPath::class);
+        $phpBinaryPath
+            ->method('majorMinorVersion')
+            ->willReturn('8.1');
+
+        $targetPlatform = new TargetPlatform(
+            OperatingSystem::Windows,
+            OperatingSystemFamily::Windows,
+            $phpBinaryPath,
+            Architecture::x86_64,
+            ThreadSafetyMode::NonThreadSafe,
+            1,
+            WindowsCompiler::VC15,
+        );
+
+        $downloadUrlMethod = DownloadUrlMethod::fromPackage($package, $targetPlatform);
+
+        self::assertSame(DownloadUrlMethod::WindowsBinaryDownload, $downloadUrlMethod);
+
+        self::assertSame(
+            [
+                'php_foo-1.2.3-8.1-nts-vc15-x86_64.zip',
+                'php_foo-1.2.3-8.1-vc15-nts-x86_64.zip',
+            ],
+            $downloadUrlMethod->possibleAssetNames($package, $targetPlatform),
+        );
     }
 
     public function testPrePackagedSourceDownloads(): void
     {
-        self::markTestIncomplete('todo'); // @todo
+        $composerPackage = $this->createMock(CompletePackage::class);
+        $composerPackage->method('getPrettyName')->willReturn('foo/bar');
+        $composerPackage->method('getPrettyVersion')->willReturn('1.2.3');
+        $composerPackage->method('getType')->willReturn('php-ext');
+        $composerPackage->method('getPhpExt')->willReturn(['download-url-method' => 'pre-packaged-source']);
+
+        $package = Package::fromComposerCompletePackage($composerPackage);
+
+        $targetPlatform = new TargetPlatform(
+            OperatingSystem::NonWindows,
+            OperatingSystemFamily::Linux,
+            PhpBinaryPath::fromCurrentProcess(),
+            Architecture::x86_64,
+            ThreadSafetyMode::NonThreadSafe,
+            1,
+            null,
+        );
+
+        $downloadUrlMethod = DownloadUrlMethod::fromPackage($package, $targetPlatform);
+
+        self::assertSame(DownloadUrlMethod::PrePackagedSourceDownload, $downloadUrlMethod);
+
+        self::assertSame(
+            [
+                'php_bar-1.2.3-src.tgz',
+                'php_bar-1.2.3-src.zip',
+            ],
+            $downloadUrlMethod->possibleAssetNames($package, $targetPlatform),
+        );
     }
 
     public function testComposerDefaultDownload(): void
     {
-        self::markTestIncomplete('todo'); // @todo
+        $package = new Package(
+            $this->createMock(CompletePackageInterface::class),
+            ExtensionType::PhpModule,
+            ExtensionName::normaliseFromString('foo'),
+            'foo/foo',
+            '1.2.3',
+            null,
+        );
+
+        $targetPlatform = new TargetPlatform(
+            OperatingSystem::NonWindows,
+            OperatingSystemFamily::Linux,
+            PhpBinaryPath::fromCurrentProcess(),
+            Architecture::x86_64,
+            ThreadSafetyMode::NonThreadSafe,
+            1,
+            null,
+        );
+
+        $downloadUrlMethod = DownloadUrlMethod::fromPackage($package, $targetPlatform);
+
+        self::assertSame(DownloadUrlMethod::ComposerDefaultDownload, $downloadUrlMethod);
+
+        self::assertNull($downloadUrlMethod->possibleAssetNames($package, $targetPlatform));
     }
 }
diff --git a/test/unit/Platform/PrePackagedSourceAssetNameTest.php b/test/unit/Platform/PrePackagedSourceAssetNameTest.php
index 426aebc..5a47f14 100644
--- a/test/unit/Platform/PrePackagedSourceAssetNameTest.php
+++ b/test/unit/Platform/PrePackagedSourceAssetNameTest.php
@@ -4,6 +4,10 @@
 
 namespace Php\PieUnitTest\Platform;
 
+use Composer\Package\CompletePackageInterface;
+use Php\Pie\DependencyResolver\Package;
+use Php\Pie\ExtensionName;
+use Php\Pie\ExtensionType;
 use Php\Pie\Platform\PrePackagedSourceAssetName;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\TestCase;
@@ -13,6 +17,21 @@ final class PrePackagedSourceAssetNameTest extends TestCase
 {
     public function testPackageNames(): void
     {
-        self::markTestIncomplete('todo'); // @todo
+        self::assertSame(
+            [
+                'php_foobar-1.2.3-src.tgz',
+                'php_foobar-1.2.3-src.zip',
+            ],
+            PrePackagedSourceAssetName::packageNames(
+                new Package(
+                    $this->createMock(CompletePackageInterface::class),
+                    ExtensionType::PhpModule,
+                    ExtensionName::normaliseFromString('foobar'),
+                    'foo/bar',
+                    '1.2.3',
+                    null,
+                ),
+            ),
+        );
     }
 }