### Question:
SolrQueryTranslator extends
        AbstractQueryTranslator<String, SolrOrderings, List<String>> implements
        QueryTranslator<String, SolrOrderings, List<String>> { @Override public String and(String... subqueries) { return junction(SolrOperator.AND, subqueries); } SolrQueryTranslator(PropertyResolver propertyResolver); @Override String eq(String fieldName, Object value); @Override String ne(String fieldName, Object value); @Override String lt(String fieldName, Object value); @Override String lte(String fieldName, Object value); @Override String gt(String fieldName, Object value); @Override String gte(String fieldName, Object value); @Override String between(String fieldName, Object from, Object to); @Override String in(String fieldName, Object[] values); @Override String notIn(String fieldName, Object[] values); @Override String contains(String fieldName, Object[] values); @Override String isNull(String fieldName); @Override String notNull(String fieldName); @Override String isEmpty(String fieldName); @Override String notEmpty(String fieldName); @Override String within(String fieldName,
            Point<N> center, Number distance); SolrSpatialQuery getSpatialQuery(Query<T, R> query); @Override String and(String... subqueries); @Override String or(String... subqueries); @Override SolrOrderings order(String fieldName, Order o); @Override SolrOrderings order(SolrOrderings... orderings); @Override List<String> translateProjection(Query<T, R> query); static final String TIMESTAMP_FORMAT; }### Answer:
@Test public void and_none() { assertEquals("", translator.and()); }
@Test public void and_one() { String q1 = "test this"; assertEquals(q1, translator.and(q1)); }
@Test public void and_many() { String q1 = "test this"; String q2 = "test that"; String q3 = "testing"; String expected = "(" + q1 + ")" + opAND + "(" + q2 + ")" + opAND + "(" + q3 + ")"; String actual = translator.and(q1, q2, q3); assertEquals(expected, actual); }