diff --git a/test/assets/certs/with-logotype-extension/cert1.pem b/test/assets/certs/with-logotype-extension/cert1.pem
new file mode 100644
index 0000000..cab6c62
--- /dev/null
+++ b/test/assets/certs/with-logotype-extension/cert1.pem
@@ -0,0 +1,54 @@
+-----BEGIN CERTIFICATE-----
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\ No newline at end of file
diff --git a/test/assets/certs/with-logotype-extension/cert2.pem b/test/assets/certs/with-logotype-extension/cert2.pem
new file mode 100644
index 0000000..ca2bc8e
--- /dev/null
+++ b/test/assets/certs/with-logotype-extension/cert2.pem
@@ -0,0 +1,82 @@
+-----BEGIN CERTIFICATE-----
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\ No newline at end of file
diff --git a/test/assets/certs/with-logotype-extension/cert3.pem b/test/assets/certs/with-logotype-extension/cert3.pem
new file mode 100644
index 0000000..00760cd
--- /dev/null
+++ b/test/assets/certs/with-logotype-extension/cert3.pem
@@ -0,0 +1,148 @@
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----
\ No newline at end of file
diff --git a/test/assets/certs/with-logotype-extension/cert4.pem b/test/assets/certs/with-logotype-extension/cert4.pem
new file mode 100644
index 0000000..26ba24c
--- /dev/null
+++ b/test/assets/certs/with-logotype-extension/cert4.pem
@@ -0,0 +1,58 @@
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----
diff --git a/test/assets/certs/with-logotype-extension/cert5.pem b/test/assets/certs/with-logotype-extension/cert5.pem
new file mode 100644
index 0000000..6f1550c
--- /dev/null
+++ b/test/assets/certs/with-logotype-extension/cert5.pem
@@ -0,0 +1,77 @@
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----
\ No newline at end of file
diff --git a/test/assets/certs/with-logotype-extension/cert6.pem b/test/assets/certs/with-logotype-extension/cert6.pem
new file mode 100644
index 0000000..c908abf
--- /dev/null
+++ b/test/assets/certs/with-logotype-extension/cert6.pem
@@ -0,0 +1,67 @@
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----
\ No newline at end of file
diff --git a/test/unit/certificate/extension/logotype/DeEncodeTest.php b/test/unit/certificate/extension/logotype/DeEncodeTest.php
new file mode 100644
index 0000000..7913f1e
--- /dev/null
+++ b/test/unit/certificate/extension/logotype/DeEncodeTest.php
@@ -0,0 +1,52 @@
+<?php
+
+declare(strict_types = 1);
+
+use PHPUnit\Framework\TestCase;
+use Sop\CryptoEncoding\PEM;
+use Sop\X509\Certificate\Certificate;
+
+/**
+ * @group certificate
+ * @group extension
+ * @group logotype
+ *
+ * @internal
+ */
+class DeEncodeTest extends TestCase
+{
+    /**
+     * @return array<string,Certificate>
+     */
+    public function testDecode(): array
+    {
+        $certFilesDir = TEST_ASSETS_DIR . '/certs/with-logotype-extension';
+        $certFiles = scandir($certFilesDir);
+
+        $result = [];
+
+        foreach ($certFiles as $certFilename) {
+            if ('pem' == strtolower(pathinfo($certFilename, PATHINFO_EXTENSION))) {
+                $pem = PEM::fromFile("{$certFilesDir}/{$certFilename}");
+                $result[$pem->string()] = Certificate::fromPEM($pem);
+            }
+        }
+
+        $this->assertGreaterThan(0, count($result));
+
+        return $result;
+    }
+
+    /**
+     * @depends testDecode
+     *
+     * @param array<string,Certificate> $certsDecoded
+     */
+    public function testEncode(array $certsDecoded)
+    {
+        foreach ($certsDecoded as $sourcePem => $cert) {
+            $certEncoded = $cert->toPEM();
+            $this->assertEquals($sourcePem, $certEncoded);
+        }
+    }
+}