diff --git a/core/tests/Drupal/KernelTests/Core/Common/SizeTest.php b/core/tests/Drupal/KernelTests/Core/Common/SizeTest.php
index 14325b5e8b..d86ed10bd6 100644
--- a/core/tests/Drupal/KernelTests/Core/Common/SizeTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Common/SizeTest.php
@@ -21,7 +21,7 @@ protected function setUp() {
     $this->exactTestCases = [
       '0 bytes' => 0,
       '1 byte' => 1,
-      '-1 byte' => -1,
+      '-1 bytes' => -1,
       '1 KB'   => $kb,
       '1 MB'   => $kb * $kb,
       '1 GB'   => $kb * $kb * $kb,
@@ -52,11 +52,8 @@ protected function setUp() {
   public function testCommonFormatSize() {
     foreach ([$this->exactTestCases, $this->roundedTestCases] as $test_cases) {
       foreach ($test_cases as $expected => $input) {
-        $this->assertEqual(
-          ($result = format_size($input, NULL)),
-          $expected,
-          $expected . ' == ' . $result . ' (' . $input . ' bytes)'
-        );
+        $result = format_size($input, NULL);
+        $this->assertSame($expected, $result, $expected . ' == ' . $result . ' (' . $input . ' bytes)');
       }
     }
   }
@@ -66,11 +63,8 @@ public function testCommonFormatSize() {
    */
   public function testCommonParseSizeFormatSize() {
     foreach ($this->exactTestCases as $size) {
-      $this->assertEqual(
-        $size,
-        ($parsed_size = Bytes::toInt($string = format_size($size, NULL))),
-        $size . ' == ' . $parsed_size . ' (' . $string . ')'
-      );
+      $parsed_size = Bytes::toInt($string = format_size($size, NULL));
+      $this->assertSame($size, $parsed_size, $size . ' == ' . $parsed_size . ' (' . $string . ')');
     }
   }