$this->drupalPostAjaxForm(NULL, $edit, 'field_paragraphs_0_collapse');
$this->assertText('You have unsaved changes on this Paragraph item.');
$this->assertText($preview_mode_text);
$this->drupalPostAjaxForm(NULL, $edit, 'field_paragraphs_0_collapse');
$this->assertText('You have unsaved changes on this Paragraph item.');
$this->assertText($preview_mode_text);