diff --git a/CRM/Contribute/Form/Task/PDFLetterCommon.php b/CRM/Contribute/Form/Task/PDFLetterCommon.php
index be8422ac9acd..ae64f85c56b4 100644
--- a/CRM/Contribute/Form/Task/PDFLetterCommon.php
+++ b/CRM/Contribute/Form/Task/PDFLetterCommon.php
@@ -30,7 +30,7 @@ public static function postProcess(&$form, $formValues = NULL) {
     if (empty($formValues)) {
       $formValues = $form->controller->exportValues($form->getName());
     }
-    list($formValues, $categories, $html_message, $messageToken, $returnProperties) = self::processMessageTemplate($formValues);
+    [$formValues, $categories, $html_message, $messageToken, $returnProperties] = self::processMessageTemplate($formValues);
     $isPDF = FALSE;
     $emailParams = [];
     if (!empty($formValues['email_options'])) {
@@ -82,7 +82,7 @@ public static function postProcess(&$form, $formValues = NULL) {
       //@todo - comment on what is stored there
       $contributionIDs = $form->getVar('_contributionContactIds');
     }
-    list($contributions, $contacts) = self::buildContributionArray($groupBy, $contributionIDs, $returnProperties, $skipOnHold, $skipDeceased, $messageToken, $task, $separator, $form->_includesSoftCredits);
+    [$contributions, $contacts] = self::buildContributionArray($groupBy, $contributionIDs, $returnProperties, $skipOnHold, $skipDeceased, $messageToken, $task, $separator, $form->_includesSoftCredits);
     $html = [];
     $contactHtml = $emailedHtml = [];
     foreach ($contributions as $contributionId => $contribution) {
@@ -135,7 +135,7 @@ public static function postProcess(&$form, $formValues = NULL) {
     if (!empty($html)) {
       $type = $formValues['document_type'];
 
-      if ($type == 'pdf') {
+      if ($type === 'pdf') {
         CRM_Utils_PDF_Utils::html2pdf($html, "CiviLetter.pdf", FALSE, $formValues);
       }
       else {
@@ -265,7 +265,7 @@ public static function buildContributionArray($groupBy, $contributionIDs, $retur
 
       if ($isIncludeSoftCredits) {
         //@todo find out why this happens & add comments
-        list($contactID) = explode('-', $item);
+        [$contactID] = explode('-', $item);
         $contactID = (int) $contactID;
       }
       else {
diff --git a/CRM/Utils/Token.php b/CRM/Utils/Token.php
index 923635f8ec56..4e7633cb32d4 100644
--- a/CRM/Utils/Token.php
+++ b/CRM/Utils/Token.php
@@ -1106,7 +1106,7 @@ public static function getTokens($string) {
 
     if ($matches[1]) {
       foreach ($matches[1] as $token) {
-        list($type, $name) = preg_split('/\./', $token, 2);
+        [$type, $name] = preg_split('/\./', $token, 2);
         if ($name && $type) {
           if (!isset($tokens[$type])) {
             $tokens[$type] = [];
@@ -1135,7 +1135,7 @@ public static function getReturnProperties(&$string) {
     );
     if ($matches[1]) {
       foreach ($matches[1] as $token) {
-        list($type, $name) = preg_split('/\./', $token, 2);
+        [$type, $name] = preg_split('/\./', $token, 2);
         if ($name) {
           $returnProperties["{$name}"] = 1;
         }
@@ -1407,7 +1407,7 @@ public static function replaceGreetingTokens(&$tokenString, $contactDetails = NU
         );
         // Prepare variables for calling replaceHookTokens
         $categories = array_keys($greetingTokens);
-        list($contact) = $greetingDetails;
+        [$contact] = $greetingDetails;
         // Replace tokens defined in Hooks.
         $tokenString = CRM_Utils_Token::replaceHookTokens($tokenString, $contact[$contactId], $categories);
       }
@@ -1532,7 +1532,7 @@ function ($matches) use ($escapeSmarty) {
   public static function getUserTokenReplacement($token, $escapeSmarty = FALSE) {
     $value = '';
 
-    list($objectName, $objectValue) = explode('-', $token, 2);
+    [$objectName, $objectValue] = explode('-', $token, 2);
 
     switch ($objectName) {
       case 'permission':
@@ -1792,6 +1792,7 @@ public static function getMembershipTokenReplacement($entity, $token, $membershi
    * @param bool $escapeSmarty
    *
    * @return mixed|string
+   * @throws \CRM_Core_Exception
    */
   public static function getContributionTokenReplacement($token, &$contribution, $html = FALSE, $escapeSmarty = FALSE) {
     self::_buildContributionTokens();
diff --git a/tests/phpunit/CRM/Contribute/Form/ContributionTest.php b/tests/phpunit/CRM/Contribute/Form/ContributionTest.php
index 37ba9509563c..3bdf2aa96811 100644
--- a/tests/phpunit/CRM/Contribute/Form/ContributionTest.php
+++ b/tests/phpunit/CRM/Contribute/Form/ContributionTest.php
@@ -1161,7 +1161,7 @@ public function testSubmitWithOutSaleTax() {
    *
    * @throws \Exception
    */
-  public function testReSubmitSaleTax($thousandSeparator) {
+  public function testReSubmitSaleTax($thousandSeparator): void {
     $this->setCurrencySeparators($thousandSeparator);
     $this->enableTaxAndInvoicing();
     $this->addTaxAccountToFinancialType($this->_financialTypeId);
@@ -1205,7 +1205,7 @@ public function testReSubmitSaleTax($thousandSeparator) {
     $mut->checkMailLog($strings);
     $this->callAPISuccessGetCount('FinancialTrxn', [], 3);
     $items = $this->callAPISuccess('FinancialItem', 'get', ['sequential' => 1])['values'];
-    $this->assertEquals(2, count($items));
+    $this->assertCount(2, $items);
     $this->assertEquals('Contribution Amount', $items[0]['description']);
     $this->assertEquals('Sales Tax', $items[1]['description']);
 
diff --git a/tests/phpunit/CRM/Contribute/Form/Task/PDFLetterCommonTest.php b/tests/phpunit/CRM/Contribute/Form/Task/PDFLetterCommonTest.php
index 5d606d08103a..e1f9e8e93a8a 100644
--- a/tests/phpunit/CRM/Contribute/Form/Task/PDFLetterCommonTest.php
+++ b/tests/phpunit/CRM/Contribute/Form/Task/PDFLetterCommonTest.php
@@ -22,7 +22,7 @@ class CRM_Contribute_Form_Task_PDFLetterCommonTest extends CiviUnitTestCase {
 
   protected $_docTypes = NULL;
 
-  protected $_contactIds = NULL;
+  protected $_contactIds;
 
   /**
    * Count how many times the hookTokens is called.
@@ -41,6 +41,8 @@ protected function setUp() {
 
   /**
    * Clean up after each test.
+   *
+   * @throws \CRM_Core_Exception
    */
   public function tearDown() {
     $this->quickCleanUpFinancialEntities();
@@ -50,8 +52,10 @@ public function tearDown() {
 
   /**
    * Test the buildContributionArray function.
+   *
+   * @throws \CRM_Core_Exception
    */
-  public function testBuildContributionArray() {
+  public function testBuildContributionArray(): void {
     $this->_individualId = $this->individualCreate();
 
     $customGroup = $this->callAPISuccess('CustomGroup', 'create', [
@@ -69,7 +73,7 @@ public function testBuildContributionArray() {
     ];
     $customField = $this->callAPISuccess('CustomField', 'create', $params);
     $customFieldKey = 'custom_' . $customField['id'];
-    $campaignTitle = 'Test Campaign ' . substr(sha1(rand()), 0, 7);
+    $campaignTitle = 'Test Campaign ';
 
     $params = [
       'contact_id' => $this->_individualId,
@@ -94,7 +98,7 @@ public function testBuildContributionArray() {
       ],
     ];
 
-    list($contributions, $contacts) = CRM_Contribute_Form_Task_PDFLetterCommon::buildContributionArray('contact_id', $contributionIDs, $returnProperties, TRUE, TRUE, $messageToken, 'test', '**', FALSE);
+    [$contributions, $contacts] = CRM_Contribute_Form_Task_PDFLetterCommon::buildContributionArray('contact_id', $contributionIDs, $returnProperties, TRUE, TRUE, $messageToken, 'test', '**', FALSE);
 
     $this->assertEquals('Anthony', $contacts[$this->_individualId]['first_name']);
     $this->assertEquals('emo', $contacts[$this->_individualId]['favourite_emoticon']);
@@ -126,8 +130,11 @@ public function hookTokenValues(&$details, $contactIDs, $jobID, $tokens, $classN
   /**
    * Test contribution token replacement in
    * html returned by postProcess function.
+   *
+   * @throws \CiviCRM_API3_Exception
+   * @throws \CRM_Core_Exception
    */
-  public function testPostProcess() {
+  public function testPostProcess(): void {
     $this->createLoggedInUser();
     $this->_individualId = $this->individualCreate();
     foreach (['docx', 'odt'] as $docType) {
@@ -171,10 +178,14 @@ public function testPostProcess() {
   /**
    * Test assignment of variables when using the group by function.
    *
-   * We are looking to see that the contribution aggregate and contributions arrays reflect the most
-   * recent contact rather than a total aggregate, since we are using group by.
+   * We are looking to see that the contribution aggregate and contributions
+   * arrays reflect the most recent contact rather than a total aggregate,
+   * since we are using group by.
+   *
+   * @throws \CiviCRM_API3_Exception
+   * @throws \CRM_Core_Exception
    */
-  public function testPostProcessGroupByContact() {
+  public function testPostProcessGroupByContact(): void {
     $this->createLoggedInUser();
     $this->hookClass->setHook('civicrm_tokenValues', [$this, 'hook_aggregateTokenValues']);
     $this->hookClass->setHook('civicrm_tokens', [$this, 'hook_tokens']);