@Test
    public void testLiteralBoolean() throws ParseException {
        Document input = new Document(type, "id:scheme:mytype::");
        input.setFieldValue("in-1", new StringFieldValue("foo"));
        var expression = Expression.fromString("if (input 'in-1' == \"foo\") { true | summary 'mybool' | attribute 'mybool' }");
        Document output = Expression.execute(expression, input);
        assertNotNull(output);
        assertEquals(new BoolFieldValue(true), output.getFieldValue("mybool"));
    }
@author Simon Thoresen Hult
@author bratseth
indexinglanguage/src/test/java/com/yahoo/vespa/indexinglanguage/ScriptTestCase.java