Create a "Basic page" node and verify its consistency in the database.
function testNodeViewModeChange() {
$web_user = $this
->drupalCreateUser(array(
'create page content',
'edit own page content',
));
$this
->drupalLogin($web_user);
// Create a node.
$edit = array();
$langcode = LANGUAGE_NOT_SPECIFIED;
$edit["title"] = $this
->randomName(8);
$edit["body[{$langcode}][0][value]"] = t('Data that should appear only in the body for the node.');
$edit["body[{$langcode}][0][summary]"] = t('Extra data that should appear only in the teaser for the node.');
$this
->drupalPost('node/add/page', $edit, t('Save'));
$node = $this
->drupalGetNodeByTitle($edit["title"]);
// Set the flag to alter the view mode and view the node.
variable_set('node_test_change_view_mode', 'teaser');
$this
->drupalGet('node/' . $node->nid);
// Check that teaser mode is viewed.
$this
->assertText('Extra data that should appear only in the teaser for the node.', 'Teaser text present');
// Make sure body text is not present.
$this
->assertNoText('Data that should appear only in the body for the node.', 'Body text not present');
// Test that the correct build mode has been set.
$build = node_view($node);
$this
->assertEqual($build['#view_mode'], 'teaser', 'The view mode has correctly been set to teaser.');
}