diff --git a/tests/src/Functional/LibrariesWebTest.php b/tests/src/Functional/LibrariesWebTest.php
index 883b5aaf959b8c9054d5eaac7570ee322503fd4f..c1090947c8972f83974eeafc253b2847fae3743d 100644
--- a/tests/src/Functional/LibrariesWebTest.php
+++ b/tests/src/Functional/LibrariesWebTest.php
@@ -64,14 +64,14 @@ class LibrariesWebTest extends BrowserTestBase {
       'dependencies' => ['Example missing'],
     ];
     libraries_detect_dependencies($library);
-    $this->assertEqual($library['error'], 'missing dependency', 'libraries_detect_dependencies() detects missing dependency');
+    $this->assertEquals($library['error'], 'missing dependency', 'libraries_detect_dependencies() detects missing dependency');
     $error_message = t('The %dependency library, which the %library library depends on, is not installed.', [
       '%dependency' => 'Example missing',
       '%library' => $library['name'],
     ]);
     $this->verbose("Expected:<br>$error_message");
     $this->verbose('Actual:<br>' . $library['error message']);
-    $this->assertEqual($library['error message'], $error_message, 'Correct error message for a missing dependency');
+    $this->assertEquals($library['error message'], $error_message, 'Correct error message for a missing dependency');
     // Test versioned dependencies.
     $version = '1.1';
     $compatible = [
@@ -118,7 +118,7 @@ class LibrariesWebTest extends BrowserTestBase {
       $library['installed'] = TRUE;
       unset($library['error'], $library['error message']);
       libraries_detect_dependencies($library);
-      $this->assertEqual($library['error'], 'incompatible dependency', "libraries_detect_dependencies() detects incompatible version strings: '$version_string' is incompatible with '$version'");
+      $this->assertEquals($library['error'], 'incompatible dependency', "libraries_detect_dependencies() detects incompatible version strings: '$version_string' is incompatible with '$version'");
     }
     // Instead of repeating this assertion for each version string, we just
     // re-use the $library variable from the foreach loop.
@@ -129,7 +129,7 @@ class LibrariesWebTest extends BrowserTestBase {
     ]);
     $this->verbose("Expected:<br>$error_message");
     $this->verbose('Actual:<br>' . $library['error message']);
-    $this->assertEqual($library['error message'], $error_message, 'Correct error message for an incompatible dependency');
+    $this->assertEquals($library['error message'], $error_message, 'Correct error message for an incompatible dependency');
   }
 
   /**
@@ -146,7 +146,7 @@ class LibrariesWebTest extends BrowserTestBase {
     $actual = libraries_scan_info_files();
     $this->verbose('Expected:<pre>' . var_export($expected, TRUE) . '</pre>');
     $this->verbose('Actual:<pre>' . var_export($actual, TRUE) . '</pre>');
-    $this->assertEqual($actual, $expected, 'libraries_scan_info_files() correctly finds the example info file.');
+    $this->assertEquals($actual, $expected, 'libraries_scan_info_files() correctly finds the example info file.');
     $this->verbose('<pre>' . var_export(libraries_scan_info_files(), TRUE) . '</pre>');
   }
 
@@ -170,7 +170,7 @@ class LibrariesWebTest extends BrowserTestBase {
     $library = libraries_info('example_files');
     $this->verbose('Expected:<pre>' . var_export($expected, TRUE) . '</pre>');
     $this->verbose('Actual:<pre>' . var_export($library, TRUE) . '</pre>');
-    $this->assertEqual($library, $expected, 'Library information is correctly gathered.');
+    $this->assertEquals($library, $expected, 'Library information is correctly gathered.');
 
     // Test a library specified with an .info file gets detected.
     $expected = [
@@ -185,7 +185,7 @@ class LibrariesWebTest extends BrowserTestBase {
     unset($library['core'], $library['datestamp'], $library['project'], $library['version']);
     $this->verbose('Expected:<pre>' . var_export($expected, TRUE) . '</pre>');
     $this->verbose('Actual:<pre>' . var_export($library, TRUE) . '</pre>');
-    $this->assertEqual($library, $expected, 'Library specified with an .info file found');
+    $this->assertEquals($library, $expected, 'Library specified with an .info file found');
   }
 
   /**
@@ -195,45 +195,45 @@ class LibrariesWebTest extends BrowserTestBase {
     // Test missing library.
     $library = libraries_detect('example_missing');
     $this->verbose('<pre>' . var_export($library, TRUE) . '</pre>');
-    $this->assertEqual($library['error'], 'not found', 'Missing library not found.');
+    $this->assertEquals($library['error'], 'not found', 'Missing library not found.');
     $error_message = t('The %library library could not be found.', [
       '%library' => $library['name'],
     ]);
-    $this->assertEqual($library['error message'], $error_message, 'Correct error message for a missing library.');
+    $this->assertEquals($library['error message'], $error_message, 'Correct error message for a missing library.');
 
     // Test unknown library version.
     $library = libraries_detect('example_undetected_version');
     $this->verbose('<pre>' . var_export($library, TRUE) . '</pre>');
-    $this->assertEqual($library['error'], 'not detected', 'Undetected version detected as such.');
+    $this->assertEquals($library['error'], 'not detected', 'Undetected version detected as such.');
     $error_message = t('The version of the %library library could not be detected.', [
       '%library' => $library['name'],
     ]);
-    $this->assertEqual($library['error message'], $error_message, 'Correct error message for a library with an undetected version.');
+    $this->assertEquals($library['error message'], $error_message, 'Correct error message for a library with an undetected version.');
 
     // Test unsupported library version.
     $library = libraries_detect('example_unsupported_version');
     $this->verbose('<pre>' . var_export($library, TRUE) . '</pre>');
-    $this->assertEqual($library['error'], 'not supported', 'Unsupported version detected as such.');
+    $this->assertEquals($library['error'], 'not supported', 'Unsupported version detected as such.');
     $error_message = t('The installed version %version of the %library library is not supported.', [
       '%version' => $library['version'],
       '%library' => $library['name'],
     ]);
-    $this->assertEqual($library['error message'], $error_message, 'Correct error message for a library with an unsupported version.');
+    $this->assertEquals($library['error message'], $error_message, 'Correct error message for a library with an unsupported version.');
 
     // Test supported library version.
     $library = libraries_detect('example_supported_version');
     $this->verbose('<pre>' . var_export($library, TRUE) . '</pre>');
-    $this->assertEqual($library['installed'], TRUE, 'Supported library version found.');
+    $this->assertEquals($library['installed'], TRUE, 'Supported library version found.');
 
     // Test libraries_get_version().
     $library = libraries_detect('example_default_version_callback');
     $this->verbose('<pre>' . var_export($library, TRUE) . '</pre>');
-    $this->assertEqual($library['version'], '1', 'Expected version returned by default version callback.');
+    $this->assertEquals($library['version'], '1', 'Expected version returned by default version callback.');
 
     // Test a multiple-parameter version callback.
     $library = libraries_detect('example_multiple_parameter_version_callback');
     $this->verbose('<pre>' . var_export($library, TRUE) . '</pre>');
-    $this->assertEqual($library['version'], '1', 'Expected version returned by multiple parameter version callback.');
+    $this->assertEquals($library['version'], '1', 'Expected version returned by multiple parameter version callback.');
 
     // Test a top-level files property.
     $library = libraries_detect('example_files');
@@ -243,7 +243,7 @@ class LibrariesWebTest extends BrowserTestBase {
       'php' => ['example_1.php' => []],
     ];
     $this->verbose('<pre>' . var_export($library, TRUE) . '</pre>');
-    $this->assertEqual($library['files'], $files, 'Top-level files property works.');
+    $this->assertEquals($library['files'], $files, 'Top-level files property works.');
 
     // Test version-specific library files.
     $library = libraries_detect('example_versions');
@@ -253,22 +253,22 @@ class LibrariesWebTest extends BrowserTestBase {
       'php' => ['example_2.php' => []],
     ];
     $this->verbose('<pre>' . var_export($library, TRUE) . '</pre>');
-    $this->assertEqual($library['files'], $files, 'Version-specific library files found.');
+    $this->assertEquals($library['files'], $files, 'Version-specific library files found.');
 
     // Test missing variant.
     $library = libraries_detect('example_variant_missing');
     $this->verbose('<pre>' . var_export($library, TRUE) . '</pre>');
-    $this->assertEqual($library['variants']['example_variant']['error'], 'not found', 'Missing variant not found');
+    $this->assertEquals($library['variants']['example_variant']['error'], 'not found', 'Missing variant not found');
     $error_message = t('The %variant variant of the %library library could not be found.', [
       '%variant' => 'example_variant',
       '%library' => 'Example variant missing',
     ]);
-    $this->assertEqual($library['variants']['example_variant']['error message'], $error_message, 'Correct error message for a missing variant.');
+    $this->assertEquals($library['variants']['example_variant']['error message'], $error_message, 'Correct error message for a missing variant.');
 
     // Test existing variant.
     $library = libraries_detect('example_variant');
     $this->verbose('<pre>' . var_export($library, TRUE) . '</pre>');
-    $this->assertEqual($library['variants']['example_variant']['installed'], TRUE, 'Existing variant found.');
+    $this->assertEquals($library['variants']['example_variant']['installed'], TRUE, 'Existing variant found.');
   }
 
   /**
@@ -286,10 +286,10 @@ class LibrariesWebTest extends BrowserTestBase {
     $this->assertFalse($library['loaded'], 'Library with incompatible dependency cannot be loaded');
     $library = libraries_load('example_dependency_compatible');
     $this->verbose('<pre>' . var_export($library, TRUE) . '</pre>');
-    $this->assertEqual($library['loaded'], 1, 'Library with compatible dependency is loaded');
+    $this->assertEquals($library['loaded'], 1, 'Library with compatible dependency is loaded');
     $loaded = &drupal_static('libraries_load');
     $this->verbose('<pre>' . var_export($loaded, TRUE) . '</pre>');
-    $this->assertEqual($loaded['example_dependency']['loaded'], 1, 'Dependency library is also loaded');
+    $this->assertEquals($loaded['example_dependency']['loaded'], 1, 'Dependency library is also loaded');
   }
 
   /**
@@ -351,7 +351,7 @@ class LibrariesWebTest extends BrowserTestBase {
     $library = libraries_info('example_callback');
     $this->verbose('Expected:<pre>' . var_export($expected, TRUE) . '</pre>');
     $this->verbose('Actual:<pre>' . var_export($library, TRUE) . '</pre>');
-    $this->assertEqual($library, $expected, 'Prepare callback was applied correctly.');
+    $this->assertEquals($library, $expected, 'Prepare callback was applied correctly.');
 
     // Test a callback in the 'pre-detect' and 'post-detect' phases.
     // Successfully detected libraries should only contain version information
@@ -372,7 +372,7 @@ class LibrariesWebTest extends BrowserTestBase {
     $library = libraries_detect('example_callback');
     $this->verbose('Expected:<pre>' . var_export($expected, TRUE) . '</pre>');
     $this->verbose('Actual:<pre>' . var_export($library, TRUE) . '</pre>');
-    $this->assertEqual($library, $expected, 'Detect callback was applied correctly.');
+    $this->assertEquals($library, $expected, 'Detect callback was applied correctly.');
 
     // Test a callback in the 'pre-load' and 'post-load' phases.
     // Successfully loaded libraries should only contain information about the
@@ -384,7 +384,7 @@ class LibrariesWebTest extends BrowserTestBase {
     $library = libraries_load('example_callback');
     $this->verbose('Expected:<pre>' . var_export($expected, TRUE) . '</pre>');
     $this->verbose('Actual:<pre>' . var_export($library, TRUE) . '</pre>');
-    $this->assertEqual($library, $expected, 'Pre-load and post-load callbacks were applied correctly.');
+    $this->assertEquals($library, $expected, 'Pre-load and post-load callbacks were applied correctly.');
     // This is not recommended usually and is only used for testing purposes.
     drupal_static_reset('libraries_load');
     // Successfully loaded library variants are supposed to contain the specific
@@ -395,7 +395,7 @@ class LibrariesWebTest extends BrowserTestBase {
     $library = libraries_load('example_callback', 'example_variant');
     $this->verbose('Expected:<pre>' . var_export($expected, TRUE) . '</pre>');
     $this->verbose('Actual:<pre>' . var_export($library, TRUE) . '</pre>');
-    $this->assertEqual($library, $expected, 'Pre-detect and post-detect callbacks were applied correctly to a variant.');
+    $this->assertEquals($library, $expected, 'Pre-detect and post-detect callbacks were applied correctly to a variant.');
   }
 
   /**
diff --git a/tests/src/Kernel/LibrariesApi/LibrariesUnitTest.php b/tests/src/Kernel/LibrariesApi/LibrariesUnitTest.php
index 6ffc0127fcd39f7953e3ec5688decd80b02df771..ffcfa27b5aad238ff084c850d80b117eb9db1ce2 100644
--- a/tests/src/Kernel/LibrariesApi/LibrariesUnitTest.php
+++ b/tests/src/Kernel/LibrariesApi/LibrariesUnitTest.php
@@ -25,7 +25,7 @@ class LibrariesUnitTest extends KernelTestBase {
     // path' up-front. This is only used for testing purposed and is strongly
     // discouraged as it defeats the purpose of Libraries API in the first
     // place.
-    $this->assertEqual(libraries_get_path('example'), FALSE, 'libraries_get_path() returns FALSE for a missing library.');
+    $this->assertEquals(libraries_get_path('example'), FALSE, 'libraries_get_path() returns FALSE for a missing library.');
   }
 
   /**
@@ -47,7 +47,7 @@ class LibrariesUnitTest extends KernelTestBase {
       ],
     ];
     libraries_prepare_files($library, NULL, NULL);
-    $this->assertEqual($expected, $library, 'libraries_prepare_files() works correctly.');
+    $this->assertEquals($expected, $library, 'libraries_prepare_files() works correctly.');
   }
 
 }