diff -u b/devel_generate/src/Tests/DevelGenerateTest.php b/devel_generate/src/Tests/DevelGenerateTest.php
--- b/devel_generate/src/Tests/DevelGenerateTest.php
+++ b/devel_generate/src/Tests/DevelGenerateTest.php
@@ -96,6 +96,14 @@
     $this->assertText(t('4 users created.'));
     $this->assertText(t('Generate process complete.'));

+    // Tests that if no content types are selected an error message is shown.
+    $edit = array(
+      'num' => 4,
+      'title_length' => 4,
+    );
+    $this->drupalPostForm('admin/config/development/generate/content', $edit, t('Generate'));
+    $this->assertText(t('Please select at least one content type'));
+
     // Creating content.
     // First we create a node in order to test the Delete content checkbox.
     $this->drupalCreateNode(array('type' => 'article'));
@@ -103,15 +111,13 @@
     $edit = array(
       'num' => 4,
       'kill' => TRUE,
+      'node_types[article]' => TRUE,
       'time_range' => 604800,
       'max_comments' => 3,
       'title_length' => 4,
       'add_alias' => 1,
     );
     $this->drupalPostForm('admin/config/development/generate/content', $edit, t('Generate'));
-    $this->assertText(t('Please select at least one content type'));
-    $edit['node_types[article]'] = TRUE;
-    $this->drupalPostForm('admin/config/development/generate/content', $edit, t('Generate'));
     $this->assertText(t('Deleted 1 nodes.'));
     $this->assertText(t('Finished creating 4 nodes'));
     $this->assertText(t('Generate process complete.'));