diff --git a/CharacterStream.php b/CharacterStream.php
index faf5359..749066f 100644
--- a/CharacterStream.php
+++ b/CharacterStream.php
@@ -114,7 +114,6 @@ public function read(int $length): ?string
         if ($this->currentPos >= $this->charCount) {
             return null;
         }
-        $ret = null;
         $length = ($this->currentPos + $length > $this->charCount) ? $this->charCount - $this->currentPos : $length;
         if ($this->fixedWidth > 0) {
             $len = $length * $this->fixedWidth;
diff --git a/Tests/EmailTest.php b/Tests/EmailTest.php
index eb792c2..bfd3005 100644
--- a/Tests/EmailTest.php
+++ b/Tests/EmailTest.php
@@ -319,7 +319,6 @@ public function testGenerateBody()
         $e->text('text content');
         $e->attach($file);
         $e->attach($image, 'test.gif');
-        $fullhtml = new TextPart($content, 'utf-8', 'html');
         $body = $e->getBody();
         $this->assertInstanceOf(MixedPart::class, $body);
         $this->assertCount(2, $related = $body->getParts());
@@ -376,7 +375,7 @@ public function testSerialize()
         $e->from('fabien@symfony.com');
         $e->text($r);
         $e->html($r);
-        $contents = file_get_contents($name = __DIR__.'/Fixtures/mimetypes/test', 'r');
+        $name = __DIR__.'/Fixtures/mimetypes/test';
         $file = fopen($name, 'r');
         $e->attach($file, 'test');
         $expected = clone $e;
diff --git a/Tests/Header/HeadersTest.php b/Tests/Header/HeadersTest.php
index 3568c9a..e2eb75a 100644
--- a/Tests/Header/HeadersTest.php
+++ b/Tests/Header/HeadersTest.php
@@ -173,8 +173,6 @@ public function testAllReturnsEmptyArrayIfNoneSet()
 
     public function testRemoveRemovesAllHeadersWithName()
     {
-        $header0 = new UnstructuredHeader('X-Test', 'some@id');
-        $header1 = new UnstructuredHeader('X-Test', 'other@id');
         $headers = new Headers();
         $headers->addIdHeader('X-Test', 'some@id');
         $headers->addIdHeader('X-Test', 'other@id');
@@ -185,7 +183,6 @@ public function testRemoveRemovesAllHeadersWithName()
 
     public function testHasIsNotCaseSensitive()
     {
-        $header = new IdentificationHeader('Message-ID', 'some@id');
         $headers = new Headers();
         $headers->addIdHeader('Message-ID', 'some@id');
         $this->assertTrue($headers->has('message-id'));
@@ -209,7 +206,6 @@ public function testAllIsNotCaseSensitive()
 
     public function testRemoveIsNotCaseSensitive()
     {
-        $header = new IdentificationHeader('Message-ID', 'some@id');
         $headers = new Headers();
         $headers->addIdHeader('Message-ID', 'some@id');
         $headers->remove('message-id');
diff --git a/Tests/Header/IdentificationHeaderTest.php b/Tests/Header/IdentificationHeaderTest.php
index b7f0095..7d274ab 100644
--- a/Tests/Header/IdentificationHeaderTest.php
+++ b/Tests/Header/IdentificationHeaderTest.php
@@ -103,7 +103,7 @@ public function testInvalidIdLeftThrowsException()
     {
         $this->expectException('Exception');
         $this->expectExceptionMessage('Email "a b c@d" does not comply with addr-spec of RFC 2822.');
-        $header = new IdentificationHeader('References', 'a b c@d');
+        new IdentificationHeader('References', 'a b c@d');
     }
 
     public function testIdRightCanBeDotAtom()
@@ -139,7 +139,7 @@ public function testInvalidIdRightThrowsException()
     {
         $this->expectException('Exception');
         $this->expectExceptionMessage('Email "a@b c d" does not comply with addr-spec of RFC 2822.');
-        $header = new IdentificationHeader('References', 'a@b c d');
+        new IdentificationHeader('References', 'a@b c d');
     }
 
     public function testMissingAtSignThrowsException()
@@ -149,7 +149,7 @@ public function testMissingAtSignThrowsException()
         /* -- RFC 2822, 3.6.4.
          msg-id          =       [CFWS] "<" id-left "@" id-right ">" [CFWS]
          */
-        $header = new IdentificationHeader('References', 'abc');
+        new IdentificationHeader('References', 'abc');
     }
 
     public function testSetBody()
diff --git a/Tests/Header/PathHeaderTest.php b/Tests/Header/PathHeaderTest.php
index 6bc029a..a8386f8 100644
--- a/Tests/Header/PathHeaderTest.php
+++ b/Tests/Header/PathHeaderTest.php
@@ -26,7 +26,7 @@ public function testSingleAddressCanBeSetAndFetched()
     public function testAddressMustComplyWithRfc2822()
     {
         $this->expectException('Exception');
-        $header = new PathHeader('Return-Path', new Address('chr is@swiftmailer.org'));
+        new PathHeader('Return-Path', new Address('chr is@swiftmailer.org'));
     }
 
     public function testValueIsAngleAddrWithValidAddress()