diff --git a/src/Plugin.php b/src/Plugin.php
index 6b50628..779ef12 100644
--- a/src/Plugin.php
+++ b/src/Plugin.php
@@ -12,6 +12,7 @@
 use Pest\TypeCoverage\Logging\JsonLogger;
 use Pest\TypeCoverage\Logging\NullLogger;
 use Pest\TypeCoverage\Support\ConfigurationSourceDetector;
+use Pest\TypeCoverage\Support\FileResolver;
 use Symfony\Component\Console\Output\OutputInterface;
 use Symfony\Component\Finder\Finder;
 
@@ -63,6 +64,8 @@ public function handleOriginalArguments(array $arguments): void
 
         $startTime = microtime(true);
 
+        $filePaths = $this->extractFileArguments($arguments);
+
         foreach ($arguments as $argument) {
             if (str_starts_with($argument, '--min')) {
                 // grab the value of the --min argument
@@ -111,24 +114,39 @@ public function handleOriginalArguments(array $arguments): void
             }
         }
 
-        $source = ConfigurationSourceDetector::detect();
+        if ($filePaths !== []) {
+            $resolvedFiles = FileResolver::resolve($filePaths);
 
-        if ($source === []) {
-            View::render('components.badge', [
-                'type' => 'ERROR',
-                'content' => 'No source section found. Did you forget to add a `source` section to your `phpunit.xml` file?',
-            ]);
+            if ($resolvedFiles === []) {
+                View::render('components.badge', [
+                    'type' => 'ERROR',
+                    'content' => 'No PHP files found in the specified paths.',
+                ]);
 
-            $this->exit(1);
-        }
+                $this->exit(1);
+            }
 
-        $files = Finder::create()->in($source)->name('*.php')->files();
+            $files = array_combine($resolvedFiles, $resolvedFiles);
+        } else {
+            $source = ConfigurationSourceDetector::detect();
+
+            if ($source === []) {
+                View::render('components.badge', [
+                    'type' => 'ERROR',
+                    'content' => 'No source section found. Did you forget to add a `source` section to your `phpunit.xml` file?',
+                ]);
+
+                $this->exit(1);
+            }
+
+            $files = Finder::create()->in($source)->name('*.php')->files();
+        }
         $totals = [];
 
         $this->output->writeln(['']);
 
         Analyser::analyse(
-            array_keys(iterator_to_array($files)),
+            is_array($files) ? array_keys($files) : array_keys(iterator_to_array($files)),
             function (Result $result) use (&$totals): void {
                 $path = str_replace(TestSuite::getInstance()->rootPath.DIRECTORY_SEPARATOR, '', $result->file);
 
@@ -215,6 +233,32 @@ function (Result $result) use (&$totals): void {
         $this->exit($exitCode);
     }
 
+    /**
+     * Extracts file/directory arguments from the command line that come after the -- separator.
+     *
+     * @param  array<int, string>  $arguments
+     * @return array<int, string>
+     */
+    public function extractFileArguments(array $arguments): array
+    {
+        $filePaths = [];
+        $afterDoubleDash = false;
+
+        foreach ($arguments as $argument) {
+            if ($argument === '--') {
+                $afterDoubleDash = true;
+
+                continue;
+            }
+
+            if ($afterDoubleDash && ! str_starts_with($argument, '-')) {
+                $filePaths[] = $argument;
+            }
+        }
+
+        return $filePaths;
+    }
+
     /**
      * Exits the process with the given code.
      */
diff --git a/src/Support/FileResolver.php b/src/Support/FileResolver.php
new file mode 100644
index 0000000..886937f
--- /dev/null
+++ b/src/Support/FileResolver.php
@@ -0,0 +1,49 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pest\TypeCoverage\Support;
+
+use Symfony\Component\Finder\Finder;
+
+/**
+ * @internal
+ */
+final class FileResolver
+{
+    /**
+     * Resolves a mixed array of files and directories to a list of PHP files.
+     *
+     * @param  array<int, string>  $paths
+     * @return array<int, string>
+     */
+    public static function resolve(array $paths): array
+    {
+        if ($paths === []) {
+            return [];
+        }
+
+        $files = [];
+
+        foreach ($paths as $path) {
+            $realPath = realpath($path);
+
+            if ($realPath === false || ! file_exists($realPath)) {
+                continue;
+            }
+
+            if (is_file($realPath)) {
+                if (pathinfo($realPath, PATHINFO_EXTENSION) === 'php') {
+                    $files[] = $realPath;
+                }
+            } elseif (is_dir($realPath)) {
+                $finder = Finder::create()->in($realPath)->name('*.php')->files();
+                foreach ($finder as $file) {
+                    $files[] = $file->getRealPath();
+                }
+            }
+        }
+
+        return array_unique($files);
+    }
+}
diff --git a/tests/Fixtures/TestFiles/EmptyDir/readme.txt b/tests/Fixtures/TestFiles/EmptyDir/readme.txt
new file mode 100644
index 0000000..6c3518e
--- /dev/null
+++ b/tests/Fixtures/TestFiles/EmptyDir/readme.txt
@@ -0,0 +1 @@
+This directory contains no PHP files and is used for testing scenarios where no PHP files are found.
\ No newline at end of file
diff --git a/tests/Fixtures/TestFiles/MissingTypes.php b/tests/Fixtures/TestFiles/MissingTypes.php
new file mode 100644
index 0000000..6b50721
--- /dev/null
+++ b/tests/Fixtures/TestFiles/MissingTypes.php
@@ -0,0 +1,16 @@
+<?php
+
+namespace Tests\Fixtures\TestFiles;
+
+class MissingTypes
+{
+    public function processData($data)
+    {
+        return $data;
+    }
+
+    public function calculate($a, $b)
+    {
+        return $a + $b;
+    }
+}
diff --git a/tests/Fixtures/TestFiles/SimpleClass.php b/tests/Fixtures/TestFiles/SimpleClass.php
new file mode 100644
index 0000000..94cc9e2
--- /dev/null
+++ b/tests/Fixtures/TestFiles/SimpleClass.php
@@ -0,0 +1,13 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tests\Fixtures\TestFiles;
+
+class SimpleClass
+{
+    public function getName(): string
+    {
+        return 'simple';
+    }
+}
diff --git a/tests/Fixtures/TestFiles/SubDir/NestedClass.php b/tests/Fixtures/TestFiles/SubDir/NestedClass.php
new file mode 100644
index 0000000..1260ffb
--- /dev/null
+++ b/tests/Fixtures/TestFiles/SubDir/NestedClass.php
@@ -0,0 +1,18 @@
+<?php
+
+namespace Tests\Fixtures\TestFiles\SubDir;
+
+class NestedClass
+{
+    private $value;
+
+    public function setValue($value)
+    {
+        $this->value = $value;
+    }
+
+    public function getValue()
+    {
+        return $this->value;
+    }
+}
diff --git a/tests/Fixtures/TestFiles/readme.txt b/tests/Fixtures/TestFiles/readme.txt
new file mode 100644
index 0000000..65d9a31
--- /dev/null
+++ b/tests/Fixtures/TestFiles/readme.txt
@@ -0,0 +1 @@
+This is a non-PHP file that should be ignored during file resolution.
\ No newline at end of file
diff --git a/tests/Plugin.php b/tests/Plugin.php
index db7fc21..87c36b2 100644
--- a/tests/Plugin.php
+++ b/tests/Plugin.php
@@ -169,3 +169,157 @@ public function exit(int $code): never
 
     unlink(__DIR__.'/../test.json');
 })->todo();
+
+test('extracts file arguments correctly', function () {
+    $plugin = new class(new BufferedOutput) extends Plugin
+    {
+        public function exit(int $code): never
+        {
+            throw new Exception($code);
+        }
+    };
+
+    $arguments = ['--type-coverage', '--', 'file1.php', 'dir1/', 'file2.php'];
+    expect($plugin->extractFileArguments($arguments))
+        ->toBe(['file1.php', 'dir1/', 'file2.php']);
+
+    $arguments = ['--type-coverage', '--min=80'];
+    expect($plugin->extractFileArguments($arguments))->toBe([]);
+
+    $arguments = ['--type-coverage', '--', 'file1.php', '--some-option'];
+    expect($plugin->extractFileArguments($arguments))->toBe(['file1.php']);
+});
+
+test('handles specific file arguments', function () {
+    $output = new BufferedOutput;
+    $plugin = new class($output) extends Plugin
+    {
+        public function exit(int $code): never
+        {
+            throw new Exception($code);
+        }
+    };
+
+    $testFile = __DIR__.'/Fixtures/TestFiles/SimpleClass.php';
+    $arguments = ['--type-coverage', '--', $testFile];
+
+    expect(fn () => $plugin->handleOriginalArguments($arguments))->toThrow(Exception::class, 0);
+
+    $output = $output->fetch();
+    expect($output)->toContain('SimpleClass.php')
+        ->and($output)->toContain('100%')
+        ->and($output)->toContain('Total: 100.0 %');
+});
+
+test('handles directory arguments', function () {
+    $output = new BufferedOutput;
+    $plugin = new class($output) extends Plugin
+    {
+        public function exit(int $code): never
+        {
+            throw new Exception($code);
+        }
+    };
+
+    $testDir = __DIR__.'/Fixtures/TestFiles';
+    $arguments = ['--type-coverage', '--', $testDir];
+
+    expect(fn () => $plugin->handleOriginalArguments($arguments))->toThrow(Exception::class, 0);
+
+    $output = $output->fetch();
+    expect($output)->toContain('SimpleClass.php')
+        ->and($output)->toContain('MissingTypes.php')
+        ->and($output)->toContain('NestedClass.php')
+        ->and($output)->not->toContain('readme.txt');
+});
+
+test('handles mixed file and directory arguments', function () {
+    $output = new BufferedOutput;
+    $plugin = new class($output) extends Plugin
+    {
+        public function exit(int $code): never
+        {
+            throw new Exception($code);
+        }
+    };
+
+    $testFile = __DIR__.'/Fixtures/TestFiles/SimpleClass.php';
+    $testSubDir = __DIR__.'/Fixtures/TestFiles/SubDir';
+    $arguments = ['--type-coverage', '--', $testFile, $testSubDir];
+
+    expect(fn () => $plugin->handleOriginalArguments($arguments))->toThrow(Exception::class, 0);
+
+    $output = $output->fetch();
+    expect($output)->toContain('SimpleClass.php')
+        ->and($output)->toContain('NestedClass.php')
+        ->and($output)->not->toContain('MissingTypes.php');
+});
+
+test('shows error when no PHP files found in specified paths', function () {
+    $output = new BufferedOutput;
+    $plugin = new class($output) extends Plugin
+    {
+        public function exit(int $code): never
+        {
+            throw new Exception($code);
+        }
+    };
+
+    $emptyDir = __DIR__.'/Fixtures/TestFiles/EmptyDir';
+    $arguments = ['--type-coverage', '--', $emptyDir];
+
+    $initialLevel = ob_get_level();
+
+    expect(fn () => $plugin->handleOriginalArguments($arguments))->toThrow(Exception::class, '1');
+
+    while (ob_get_level() > $initialLevel) {
+        ob_end_clean();
+    }
+});
+
+test('works with non-existent files and valid files mixed', function () {
+    $output = new BufferedOutput;
+    $plugin = new class($output) extends Plugin
+    {
+        public function exit(int $code): never
+        {
+            throw new Exception($code);
+        }
+    };
+
+    $validFile = __DIR__.'/Fixtures/TestFiles/SimpleClass.php';
+    $invalidFile = __DIR__.'/Fixtures/TestFiles/NonExistent.php';
+    $arguments = ['--type-coverage', '--', $validFile, $invalidFile];
+
+    expect(fn () => $plugin->handleOriginalArguments($arguments))->toThrow(Exception::class, 0);
+
+    $output = $output->fetch();
+    expect($output)->toContain('SimpleClass.php')
+        ->and($output)->toContain('Total: 100.0 %');
+});
+
+test('combines file arguments with other options', function () {
+    $output = new BufferedOutput;
+    $plugin = new class($output) extends Plugin
+    {
+        public function exit(int $code): never
+        {
+            throw new Exception((string) $code);
+        }
+    };
+
+    $testFile = __DIR__.'/Fixtures/TestFiles/MissingTypes.php';
+    $arguments = ['--type-coverage', '--compact', '--min=90.0', '--', $testFile];
+
+    $initialLevel = ob_get_level();
+
+    expect(fn () => $plugin->handleOriginalArguments($arguments))->toThrow(Exception::class, '1');
+
+    while (ob_get_level() > $initialLevel) {
+        ob_end_clean();
+    }
+
+    $output = $output->fetch();
+    expect($output)->toContain('MissingTypes.php')
+        ->and($output)->toContain('50%');
+});
diff --git a/tests/Support/FileResolver.php b/tests/Support/FileResolver.php
new file mode 100644
index 0000000..50d33b3
--- /dev/null
+++ b/tests/Support/FileResolver.php
@@ -0,0 +1,93 @@
+<?php
+
+use Pest\TypeCoverage\Support\FileResolver;
+
+beforeEach(function () {
+    $this->fixturesPath = __DIR__.'/../Fixtures/TestFiles';
+});
+
+test('resolves empty array when no paths provided', function () {
+    expect(FileResolver::resolve([]))->toBe([]);
+});
+
+test('resolves single PHP file', function () {
+    $phpFile = $this->fixturesPath.'/SimpleClass.php';
+
+    $result = FileResolver::resolve([$phpFile]);
+
+    expect($result)->toHaveCount(1)
+        ->and($result[0])->toBe(realpath($phpFile));
+});
+
+test('ignores non-PHP files', function () {
+    $phpFile = $this->fixturesPath.'/SimpleClass.php';
+    $txtFile = $this->fixturesPath.'/readme.txt';
+
+    $result = FileResolver::resolve([$phpFile, $txtFile]);
+
+    expect($result)->toHaveCount(1)
+        ->and($result[0])->toBe(realpath($phpFile));
+});
+
+test('resolves directory to PHP files', function () {
+    $result = FileResolver::resolve([$this->fixturesPath]);
+
+    expect($result)->toHaveCount(3)
+        ->and(in_array(realpath($this->fixturesPath.'/SimpleClass.php'), $result))->toBeTrue()
+        ->and(in_array(realpath($this->fixturesPath.'/MissingTypes.php'), $result))->toBeTrue()
+        ->and(in_array(realpath($this->fixturesPath.'/SubDir/NestedClass.php'), $result))->toBeTrue();
+});
+
+test('resolves nested directories', function () {
+    $result = FileResolver::resolve([$this->fixturesPath]);
+
+    expect($result)->toHaveCount(3)
+        ->and(in_array(realpath($this->fixturesPath.'/SimpleClass.php'), $result))->toBeTrue()
+        ->and(in_array(realpath($this->fixturesPath.'/SubDir/NestedClass.php'), $result))->toBeTrue();
+});
+
+test('handles mixed files and directories', function () {
+    $directFile = $this->fixturesPath.'/SimpleClass.php';
+    $subDir = $this->fixturesPath.'/SubDir';
+
+    $result = FileResolver::resolve([$directFile, $subDir]);
+
+    expect($result)->toHaveCount(2)
+        ->and(in_array(realpath($directFile), $result))->toBeTrue()
+        ->and(in_array(realpath($this->fixturesPath.'/SubDir/NestedClass.php'), $result))->toBeTrue();
+});
+
+test('skips non-existent paths', function () {
+    $existingFile = $this->fixturesPath.'/SimpleClass.php';
+    $nonExistentFile = $this->fixturesPath.'/nonexistent.php';
+    $nonExistentDir = $this->fixturesPath.'/nonexistent_dir';
+
+    $result = FileResolver::resolve([$existingFile, $nonExistentFile, $nonExistentDir]);
+
+    expect($result)->toHaveCount(1)
+        ->and($result[0])->toBe(realpath($existingFile));
+});
+
+test('removes duplicate files', function () {
+    $phpFile = $this->fixturesPath.'/SimpleClass.php';
+
+    $result = FileResolver::resolve([$phpFile, $phpFile, $this->fixturesPath]);
+
+    expect($result)->toHaveCount(3);
+});
+
+test('handles empty directory', function () {
+    $emptyDir = $this->fixturesPath.'/EmptyDir';
+
+    $result = FileResolver::resolve([$emptyDir]);
+
+    expect($result)->toBe([]);
+});
+
+test('handles directory with no PHP files', function () {
+    $emptyDir = $this->fixturesPath.'/EmptyDir';
+
+    $result = FileResolver::resolve([$emptyDir]);
+
+    expect($result)->toBe([]);
+});