diff --git a/src/PackageReader/Internal/FilteredPackageReader.php b/src/PackageReader/Internal/FilteredPackageReader.php
index 548674a..a1613a1 100644
--- a/src/PackageReader/Internal/FilteredPackageReader.php
+++ b/src/PackageReader/Internal/FilteredPackageReader.php
@@ -57,18 +57,19 @@ public static function createFromFile(string $filename): self
         return new self($filename, $archive);
     }
 
-    /** @inheritDoc */
+    /**
+     * @inheritDoc
+     * @codeCoverageIgnore Unable to produce code coverage for error handling
+     */
     public static function createFromContents(string $content): self
     {
         // create temp file
         try {
             $tmpfile = tempnam(sys_get_temp_dir(), '');
         } catch (Throwable $exception) {
-            /** @codeCoverageIgnore */
             throw CreateTemporaryZipFileException::create('Cannot create a temporary file', $exception);
         }
         if (false === $tmpfile) {
-            /** @codeCoverageIgnore */
             throw CreateTemporaryZipFileException::create('Cannot not create a temporary file');
         }
 
@@ -76,11 +77,9 @@ public static function createFromContents(string $content): self
         try {
             $write = file_put_contents($tmpfile, $content);
         } catch (Throwable $exception) {
-            /** @codeCoverageIgnore */
             throw CreateTemporaryZipFileException::create('Cannot store contents on temporary file', $exception);
         }
         if (false === $write) {
-            /** @codeCoverageIgnore */
             throw CreateTemporaryZipFileException::create('Cannot store contents on temporary file');
         }
 
diff --git a/tests/Unit/PackageReader/Internal/ThirdPartiesExtractorTest.php b/tests/Unit/PackageReader/Internal/ThirdPartiesExtractorTest.php
new file mode 100644
index 0000000..847d99e
--- /dev/null
+++ b/tests/Unit/PackageReader/Internal/ThirdPartiesExtractorTest.php
@@ -0,0 +1,77 @@
+<?php
+
+declare(strict_types=1);
+
+namespace PhpCfdi\SatWsDescargaMasiva\Tests\Unit\PackageReader\Internal;
+
+use ArrayIterator;
+use LogicException;
+use PhpCfdi\SatWsDescargaMasiva\PackageReader\Internal\CsvReader;
+use PhpCfdi\SatWsDescargaMasiva\PackageReader\Internal\FileFilters\NullFileFilter;
+use PhpCfdi\SatWsDescargaMasiva\PackageReader\Internal\FilteredPackageReader;
+use PhpCfdi\SatWsDescargaMasiva\PackageReader\Internal\ThirdPartiesExtractor;
+use PhpCfdi\SatWsDescargaMasiva\PackageReader\PackageReaderInterface;
+use PhpCfdi\SatWsDescargaMasiva\Tests\TestCase;
+
+final class ThirdPartiesExtractorTest extends TestCase
+{
+    public function testExtractor(): void
+    {
+        $source = [
+            ['Uuid', 'RfcACuentaTerceros', 'NombreACuentaTerceros'],
+            ['00000000-aaaa-bbbb-1111-000000000001', 'AAAA010101AAA', 'Registro de ejemplo 1'],
+            ['00000000-aaaa-bbbb-1111-000000000002', 'AAAA010102AAA', 'Registro de ejemplo 2'],
+            ['00000000-aaaa-bbbb-1111-000000000003', 'AAAA010103AAA', 'Registro de ejemplo 3'],
+        ];
+        $expected = [
+            '00000000-AAAA-BBBB-1111-000000000001' => [
+                'RfcACuentaTerceros' => 'AAAA010101AAA',
+                'NombreACuentaTerceros' => 'Registro de ejemplo 1',
+            ],
+            '00000000-AAAA-BBBB-1111-000000000002' => [
+                'RfcACuentaTerceros' => 'AAAA010102AAA',
+                'NombreACuentaTerceros' => 'Registro de ejemplo 2',
+            ],
+            '00000000-AAAA-BBBB-1111-000000000003' => [
+                'RfcACuentaTerceros' => 'AAAA010103AAA',
+                'NombreACuentaTerceros' => 'Registro de ejemplo 3',
+            ],
+        ];
+        $extractor = new ThirdPartiesExtractor(new CsvReader(new ArrayIterator($source)));
+        $this->assertSame($expected, iterator_to_array($extractor->eachRecord()));
+    }
+
+    public function testEmptyUuidIsIgnored(): void
+    {
+        $source = [
+            ['Uuid', 'RfcACuentaTerceros', 'NombreACuentaTerceros'],
+            ['', 'AAAA010101AAA', 'Registro de ejemplo 1'],
+        ];
+        $expected = [];
+        $extractor = new ThirdPartiesExtractor(new CsvReader(new ArrayIterator($source)));
+        $this->assertSame($expected, iterator_to_array($extractor->eachRecord()));
+    }
+
+    public function testCreateFromPackageReaderNotFilteredPackageReader(): void
+    {
+        $packageReader = $this->createMock(PackageReaderInterface::class);
+        $this->expectException(LogicException::class);
+        $this->expectExceptionMessage('PackageReader parameter must be a FilteredPackageReader');
+        ThirdPartiesExtractor::createFromPackageReader($packageReader);
+    }
+
+    public function testCreateFromPackageReaderRestoreFilter(): void
+    {
+        $packageReader = FilteredPackageReader::createFromFile($this->filePath('zip/metadata.zip'));
+        $filter = new NullFileFilter();
+        $packageReader->setFilter($filter);
+
+        ThirdPartiesExtractor::createFromPackageReader($packageReader);
+
+        $this->assertSame(
+            $filter,
+            $packageReader->getFilter(),
+            'FilteredPackageReader filter must not change after call createFromPackageReader'
+        );
+    }
+}
diff --git a/tests/Unit/RequestBuilder/FielRequestBuilder/FielTest.php b/tests/Unit/RequestBuilder/FielRequestBuilder/FielTest.php
index 1bf9e0e..7b0efc4 100644
--- a/tests/Unit/RequestBuilder/FielRequestBuilder/FielTest.php
+++ b/tests/Unit/RequestBuilder/FielRequestBuilder/FielTest.php
@@ -5,6 +5,10 @@
 namespace PhpCfdi\SatWsDescargaMasiva\Tests\Unit\RequestBuilder\FielRequestBuilder;
 
 use Exception;
+use PhpCfdi\Credentials\Certificate;
+use PhpCfdi\Credentials\Credential;
+use PhpCfdi\Credentials\Internal\SatTypeEnum;
+use PhpCfdi\Credentials\PrivateKey;
 use PhpCfdi\SatWsDescargaMasiva\RequestBuilder\FielRequestBuilder\Fiel;
 use PhpCfdi\SatWsDescargaMasiva\Tests\TestCase;
 
@@ -51,4 +55,16 @@ public function testIsNotValidUsingCsd(): void
         );
         $this->assertFalse($fiel->isValid());
     }
+
+    public function testIsNotValidExpiredCertificate(): void
+    {
+        $certificate = $this->createMock(Certificate::class);
+        $certificate->method('satType')->willReturn(SatTypeEnum::fiel());
+        $certificate->method('validOn')->willReturn(false);
+        $privateKey = $this->createMock(PrivateKey::class);
+        $privateKey->method('belongsTo')->willReturn(true);
+        $credential = new Credential($certificate, $privateKey);
+        $fiel = new Fiel($credential);
+        $this->assertFalse($fiel->isValid());
+    }
 }