@Test
public void testCreateExpressionFromDescribedExpression() {

    Expression expression = Expression.createExpressionFromDescribedExpression("hello");
    assertEquals("hello", expression.getExpression());
    assertNull(expression.getLanguage());
    expression = Expression.createExpressionFromDescribedExpression("there:hello");
    assertEquals("hello", expression.getExpression());
    assertEquals("there", expression.getLanguage());
    expression = Expression.createExpressionFromDescribedExpression("there_:hello");
    assertEquals("there_:hello", expression.getExpression());
    assertNull(expression.getLanguage());
    assertNull(Expression.createExpressionFromDescribedExpression(null));
}