@Test
    void testDefaultIsUnionStemMode() {
        IndexFacts.Session session = createIndexFacts().newSession(new Query());
        assertEquals(StemMode.NONE, session.getIndex("a").getStemMode());
        assertEquals(StemMode.NONE, session.getIndex("b").getStemMode());
    }
Tests using synthetic index names for IndexFacts class.

@author Steinar Knutsen
container-search/src/test/java/com/yahoo/prelude/test/IndexFactsTestCase.java