diff -u b/src/Tests/MonitoringUITest.php b/src/Tests/MonitoringUITest.php
--- b/src/Tests/MonitoringUITest.php
+++ b/src/Tests/MonitoringUITest.php
@@ -99,7 +99,7 @@
     $this->assertFieldByName('status', TRUE);
 
     // Test creation of Node entity aggregator sensor.
-    $this->drupalPostForm(NULL, array(
+    $this->drupalPostForm('admin/config/system/monitoring/sensors/add', array(
       'label' => 'Node Entity Aggregator sensor',
       'id' => 'ui_test_sensor',
       'plugin_id' => 'entity_aggregator',
@@ -108,30 +108,25 @@
     $this->assertText('Sensor plugin settings');
     $this->drupalPostForm(NULL, array('settings[entity_type]' => 'node'), t('Add another condition'));
 
-    // Get every available field for entity type node.
-    $node_fields = \Drupal::entityManager()->getBaseFieldDefinitions('node');
+    $edit = array(
+      'description' => 'Sensor created to test UI',
+      'value_label' => 'Test Value',
+      'caching_time' => 100,
+      'settings[aggregation][time_interval_value]' => 86400,
+      'settings[entity_type]' => 'node',
+      'conditions[0][field]' => 'type',
+      'conditions[0][value]' => 'article',
+      'conditions[1][field]' => 'sticky',
+      'conditions[1][value]' => 0,
+    );
 
-    $edit = array();
-    $edit['description'] = 'Sensor created to test UI';
-    $edit['value_label'] = 'Test Value';
-    $edit['caching_time'] = 100;
-    $edit['settings[aggregation][time_interval_value]'] = 86400;
-    $edit['settings[entity_type]'] = 'node';
-    $edit['conditions[0][field]'] = 'type';
-    $edit['conditions[0][value]'] = 'article';
-    $edit['conditions[1][field]'] = 'sticky';
-    $edit['conditions[1][value]'] = '0';
-    $i = 2;
-    foreach ($node_fields as $field) {
-      $this->drupalPostForm(NULL, array(), t('Add another field'));
-      $edit['settings[verbose_fields][' . $i++ . ']'] = $field->getName();
-    }
-    $this->drupalPostForm(NULL, $edit, t('Save'));
+    // Get every available field for the entity type node.
+    $node_fields = \Drupal::entityManager()->getBaseFieldDefinitions('node');
+    $this->addFields($node_fields, $edit);
 
     $this->assertText(SafeMarkup::format('Sensor @label saved.', array('@label' => 'Node Entity Aggregator sensor')));
 
     // Test details page by clicking the link in confirmation message.
-    $this->assertLink(t('Node Entity Aggregator sensor'));
     $this->clickLink(t('Node Entity Aggregator sensor'));
     $this->assertResponse(200);
     $this->assertText('Result');
@@ -163,7 +158,7 @@
 
     // Create a file to test.
     $file_path = file_default_scheme() . '://test';
-    $contents = "file_put_contents().";
+    $contents = "some content here!!.";
     file_put_contents($file_path, $contents);
 
     // Test if the file exist.
@@ -177,12 +172,10 @@
     $file->save();
 
     // Test if the entity was created.
-    $this->assertTrue($file->id() > 0);
-
-    $this->drupalGet('admin/config/system/monitoring/sensors/add');
+    $this->assertTrue($file->id());
 
     // Test creation of File entity aggregator sensor.
-    $this->drupalPostForm(NULL, array(
+    $this->drupalPostForm('admin/config/system/monitoring/sensors/add', array(
       'label' => 'File Entity Aggregator sensor',
       'id' => 'file_test_sensor',
       'plugin_id' => 'entity_aggregator',
@@ -195,17 +188,11 @@
     $file_fields = \Drupal::entityManager()->getBaseFieldDefinitions('file');
 
     $edit = array();
-    $i = 2;
-    foreach ($file_fields as $field) {
-      $this->drupalPostForm(NULL, array(), t('Add another field'));
-      $edit['settings[verbose_fields][' . $i++ . ']'] = $field->getName();
-    }
-    $this->drupalPostForm(NULL, $edit, t('Save'));
+    $this->addFields($file_fields, $edit);
 
     $this->assertText(SafeMarkup::format('Sensor @label saved.', array('@label' => 'File Entity Aggregator sensor')));
 
     // Test details page by clicking the link in confirmation message.
-    $this->assertLink(t('File Entity Aggregator sensor'));
     $this->clickLink(t('File Entity Aggregator sensor'));
     $this->assertResponse(200);
     $this->assertText('Result');
@@ -1076,2 +1063,14 @@
 
+  /**
+   * Add verbose fields to the sensor creation form.
+   */
+  public function addFields($fields = array(), $array = array()) {
+    $i = 2;
+    foreach ($fields as $field) {
+      $this->drupalPostForm(NULL, array(), t('Add another field'));
+      $array['settings[verbose_fields][' . $i++ . ']'] = $field->getName();
+    }
+    $this->drupalPostForm(NULL, $array, t('Save'));
+  }
+
 }