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diff --git a/web/core/modules/ban/tests/src/Functional/IpAddressBlockingTest.php b/web/core/modules/ban/tests/src/Functional/IpAddressBlockingTest.php
new file mode 100644
index 000000000..778f3dba9
--- /dev/null
+++ b/web/core/modules/ban/tests/src/Functional/IpAddressBlockingTest.php
@@ -0,0 +1,102 @@
+<?php
+
+namespace Drupal\Tests\ban\Functional;
+
+use Drupal\Tests\BrowserTestBase;
+use Drupal\Core\Database\Database;
+use Drupal\ban\BanIpManager;
+
+/**
+ * Tests IP address banning.
+ *
+ * @group ban
+ */
+class IpAddressBlockingTest extends BrowserTestBase {
+
+  /**
+   * Modules to install.
+   *
+   * @var array
+   */
+  public static $modules = ['ban'];
+
+  /**
+   * Tests various user input to confirm correct validation and saving of data.
+   */
+  public function testIPAddressValidation() {
+    // Create user.
+    $admin_user = $this->drupalCreateUser(['ban IP addresses']);
+    $this->drupalLogin($admin_user);
+    $this->drupalGet('admin/config/people/ban');
+
+    // Ban a valid IP address.
+    $edit = [];
+    $edit['ip'] = '1.2.3.3';
+    $this->drupalPostForm('admin/config/people/ban', $edit, t('Add'));
+    $ip = db_query("SELECT iid from {ban_ip} WHERE ip = :ip", [':ip' => $edit['ip']])->fetchField();
+    $this->assertTrue($ip, 'IP address found in database.');
+    $this->assertRaw(t('The IP address %ip has been banned.', ['%ip' => $edit['ip']]), 'IP address was banned.');
+
+    // Try to block an IP address that's already blocked.
+    $edit = [];
+    $edit['ip'] = '1.2.3.3';
+    $this->drupalPostForm('admin/config/people/ban', $edit, t('Add'));
+    $this->assertText(t('This IP address is already banned.'));
+
+    // Try to block a reserved IP address.
+    $edit = [];
+    $edit['ip'] = '255.255.255.255';
+    $this->drupalPostForm('admin/config/people/ban', $edit, t('Add'));
+    $this->assertText(t('Enter a valid IP address.'));
+
+    // Try to block a reserved IP address.
+    $edit = [];
+    $edit['ip'] = 'test.example.com';
+    $this->drupalPostForm('admin/config/people/ban', $edit, t('Add'));
+    $this->assertText(t('Enter a valid IP address.'));
+
+    // Submit an empty form.
+    $edit = [];
+    $edit['ip'] = '';
+    $this->drupalPostForm('admin/config/people/ban', $edit, t('Add'));
+    $this->assertText(t('Enter a valid IP address.'));
+
+    // Pass an IP address as a URL parameter and submit it.
+    $submit_ip = '1.2.3.4';
+    $this->drupalPostForm('admin/config/people/ban/' . $submit_ip, [], t('Add'));
+    $ip = db_query("SELECT iid from {ban_ip} WHERE ip = :ip", [':ip' => $submit_ip])->fetchField();
+    $this->assertTrue($ip, 'IP address found in database');
+    $this->assertRaw(t('The IP address %ip has been banned.', ['%ip' => $submit_ip]), 'IP address was banned.');
+
+    // Submit your own IP address. This fails, although it works when testing
+    // manually.
+    // TODO: On some systems this test fails due to a bug/inconsistency in cURL.
+    // $edit = array();
+    // $edit['ip'] = \Drupal::request()->getClientIP();
+    // $this->drupalPostForm('admin/config/people/ban', $edit, t('Save'));
+    // $this->assertText(t('You may not ban your own IP address.'));
+
+    // Test duplicate ip address are not present in the 'blocked_ips' table.
+    // when they are entered programmatically.
+    $connection = Database::getConnection();
+    $banIp = new BanIpManager($connection);
+    $ip = '1.0.0.0';
+    $banIp->banIp($ip);
+    $banIp->banIp($ip);
+    $banIp->banIp($ip);
+    $query = db_select('ban_ip', 'bip');
+    $query->fields('bip', ['iid']);
+    $query->condition('bip.ip', $ip);
+    $ip_count = $query->execute()->fetchAll();
+    $this->assertEqual(1, count($ip_count));
+    $ip = '';
+    $banIp->banIp($ip);
+    $banIp->banIp($ip);
+    $query = db_select('ban_ip', 'bip');
+    $query->fields('bip', ['iid']);
+    $query->condition('bip.ip', $ip);
+    $ip_count = $query->execute()->fetchAll();
+    $this->assertEqual(1, count($ip_count));
+  }
+
+}