Tests t() functionality.
function testT() {
$text = t('Simple text');
$this
->assertEqual($text, 'Simple text', 't leaves simple text alone.');
$text = t('Escaped text: @value', array(
'@value' => '<script>',
));
$this
->assertEqual($text, 'Escaped text: <script>', 't replaces and escapes string.');
$text = t('Placeholder text: %value', array(
'%value' => '<script>',
));
$this
->assertEqual($text, 'Placeholder text: <em class="placeholder"><script></em>', 't replaces, escapes and themes string.');
$text = t('Verbatim text: !value', array(
'!value' => '<script>',
));
$this
->assertEqual($text, 'Verbatim text: <script>', 't replaces verbatim string as-is.');
}