diff --git a/src/Tests/UrlIntegrationTest.php b/src/Tests/UrlIntegrationTest.php
index 62b3c45..e08008f 100644
--- a/src/Tests/UrlIntegrationTest.php
+++ b/src/Tests/UrlIntegrationTest.php
@@ -96,4 +96,132 @@ class UrlIntegrationTest extends FacetWebTestBase {
     $this->assertUrl('search-api-test-fulltext?y[0]=facet||item');
   }
 
+  /**
+   * Test colons.
+   */
+  public function testColonKey() {
+    $id = 'facet';
+    $url_alias = 'facet:colon';
+    $name = '&^Facet:@#1';
+    $facet_add_page = 'admin/config/search/facets/add-facet';
+
+    // Create the facet.
+    $this->drupalGet($facet_add_page);
+    $form_values = [
+      'id' => $id,
+      'status' => 1,
+      'url_alias' => $url_alias,
+      'name' => $name,
+      'facet_source_id' => 'search_api_views:search_api_test_views_fulltext:page_1',
+      'facet_source_configs[search_api_views:search_api_test_views_fulltext:page_1][field_identifier]' => 'entity:entity_test/type',
+    ];
+    $this->drupalPostForm(NULL, ['facet_source_id' => 'search_api_views:search_api_test_views_fulltext:page_1'], $this->t('Configure facet source'));
+    $this->drupalPostForm(NULL, $form_values, $this->t('Save'));
+
+    // Create / place block.
+    $block_values = [
+      'plugin_id' => 'facet_block:' . $id,
+      'settings' => [
+        'region' => 'footer',
+        'id' => str_replace('_', '-', $id),
+      ]
+    ];
+    $this->drupalPlaceBlock($block_values['plugin_id'], $block_values['settings']);
+
+    // Create an entity type with a colon in the name.
+    entity_test_create_bundle('test');
+    $entity_test_storage = \Drupal::entityTypeManager()->getStorage('entity_test');
+    $entity_test_storage->create([
+      'name' => 'Test:1',
+      'body' => 'test test',
+      'type' => 'test'
+    ])->save();
+    $this->indexItems($this->indexId);
+
+    // Assert that colons work.
+    $this->drupalGet('search-api-test-fulltext');
+    $this->assertResponse(200);
+    $this->assertLink('item');
+    $this->assertLink('article');
+    $this->assertLink('test');
+
+    $this->clickLink('test');
+    $this->assertResponse(200);
+
+    // Assert that filtering really worked.
+    $this->assertLink('(-) test');
+    $this->assertNoLink('article');
+    $this->assertNoLink('item');
+    $this->assertText('Test:1');
+    $this->assertNoText('bar baz');
+    $this->assertNoText('foo baz');
+    $this->assertNoText('bar');
+    $this->assertNoText('foo test');
+    $this->assertNoText('foo bar baz');
+  }
+
+  /**
+   * Test colons.
+   */
+  public function testColonValue() {
+    $id = 'facet';
+    $url_alias = 'colon';
+    $name = '&^Facet:@#1';
+    $facet_add_page = 'admin/config/search/facets/add-facet';
+
+    // Create the facet.
+    $this->drupalGet($facet_add_page);
+    $form_values = [
+      'id' => $id,
+      'status' => 1,
+      'url_alias' => $url_alias,
+      'name' => $name,
+      'facet_source_id' => 'search_api_views:search_api_test_views_fulltext:page_1',
+      'facet_source_configs[search_api_views:search_api_test_views_fulltext:page_1][field_identifier]' => 'entity:entity_test/type',
+    ];
+    $this->drupalPostForm(NULL, ['facet_source_id' => 'search_api_views:search_api_test_views_fulltext:page_1'], $this->t('Configure facet source'));
+    $this->drupalPostForm(NULL, $form_values, $this->t('Save'));
+
+    // Create / place block.
+    $block_values = [
+      'plugin_id' => 'facet_block:' . $id,
+      'settings' => [
+        'region' => 'footer',
+        'id' => str_replace('_', '-', $id),
+      ]
+    ];
+    $this->drupalPlaceBlock($block_values['plugin_id'], $block_values['settings']);
+
+    // Create an entity type with a colon in the name.
+    entity_test_create_bundle('test:colon');
+    $entity_test_storage = \Drupal::entityTypeManager()->getStorage('entity_test');
+    $entity_test_storage->create([
+      'name' => 'Test:1',
+      'body' => 'test test',
+      'type' => 'test:colon'
+    ])->save();
+    $this->indexItems($this->indexId);
+
+    // Assert that colons work.
+    $this->drupalGet('search-api-test-fulltext');
+    $this->assertResponse(200);
+    $this->assertLink('item');
+    $this->assertLink('article');
+    $this->assertLink('test:colon');
+
+    $this->clickLink('test:colon');
+    $this->assertResponse(200);
+
+    // Assert that filtering really worked.
+    $this->assertLink('(-) test:colon');
+    $this->assertNoLink('article');
+    $this->assertNoLink('item');
+    $this->assertText('Test:1');
+    $this->assertNoText('bar baz');
+    $this->assertNoText('foo baz');
+    $this->assertNoText('bar');
+    $this->assertNoText('foo test');
+    $this->assertNoText('foo bar baz');
+  }
+
 }