Fix PathautoUiTest test

Now that patterns are config entities, the UI tests were failing.
On top of that, the Add form has an Ajax interaction to select the
pattern type, which is covered too.

src/Tests/PathautoUiTest.php

@@ -84,20 +84,26 @@ class PathautoUiTest extends WebTestBase {
   }
 
   function testPatternsValidation() {
-    $edit = array();
-    $this->drupalGet('admin/config/search/path/patterns');
-    $edit['node[default]'] = '[node:title]/[user:name]/[term:name]';
-    $edit['node[bundles][page][default]'] = 'page';
-    $this->drupalPostForm('admin/config/search/path/patterns', $edit, 'Save configuration');
-    $this->assertText('The Default path pattern (applies to all content types with blank patterns below) is using the following invalid tokens: [user:name], [term:name].');
-    $this->assertText('The Pattern for all Basic page paths cannot contain fewer than one token.');
+    // Try to save an invalid pattern.
+    $this->drupalGet('admin/config/search/path/patterns/add');
+    $edit = array(
+      'type' => 'canonical_entities:node',
+    );
+    $this->drupalPostAjaxForm(NULL, $edit, 'type');
+    $edit += array(
+      'pattern' => '[node:title]/[user:name]/[term:name]',
+      'bundles[page]' => TRUE,
+      'label' => 'Page pattern',
+      'id' => 'page_pattern',
+    );
+    $this->drupalPostForm(NULL, $edit, 'Save');
+    $this->assertText('The Path pattern is using the following invalid tokens: [user:name], [term:name].');
     $this->assertNoText('The configuration options have been saved.');
 
-    $edit['node[default]'] = '[node:title]';
-    $edit['node[bundles][page][default]'] = 'page/[node:title]';
-    $edit['node[bundles][article][default]'] = '';
-    $this->drupalPostForm('admin/config/search/path/patterns', $edit, 'Save configuration');
-    $this->assertText('The configuration options have been saved.');
+    // Fix the pattern, then check that it gets saved successfully.
+    $edit['pattern'] = '[node:title]';
+    $this->drupalPostForm(NULL, $edit, 'Save');
+    $this->assertText('Pattern Page pattern saved.');
   }
 
 }