@Test
    void requireThatKeyIsEscapedInToString() {
        assertEquals("foo=10-19", new RangePartition("foo=10-19").toString());
        assertEquals("'\\foo=10-19'", new RangePartition("\foo=10-19").toString());
        assertEquals("'\\x27foo\\x27=10-19'", new RangePartition("'foo'=10-19").toString());
    }
@author <a href="mailto:magnarn@yahoo-inc.com">Magnar Nedland</a>
predicate-search-core/src/test/java/com/yahoo/document/predicate/RangePartitionTest.java