openrosa-xpath-evaluator/test/integration/openrosa-xpath/once.spec.js

Wrapper for browsers' XPath evaluator with added support for OpenRosa extensions.

const { assertStringValue, initDoc } = require('../helpers');

describe('once()', () => {
    const doc = initDoc(`
    <div id="FunctionSelectedCase">
      <div id="FunctionSelectedCaseEmpty"></div>
      <div id="FunctionSelectedCaseSingle">ab</div>
      <div id="FunctionSelectedCaseMultiple">ab cd ef gh</div>
      <div id="FunctionSelectedCaseMultiple">ij</div>
    </div>`);

    describe('evaluates when context node is empty', () => {
        const node = doc.getElementById('FunctionSelectedCaseEmpty');

        it('should set value to a string', () => {
            assertStringValue(node, null, 'once("aa")', 'aa');
        });

        it('should set value to NaN', () => {
            assertStringValue(node, null, 'once(. * 10)', 'NaN');
        });

        it('should set value to Inifity', () => {
            assertStringValue(node, null, 'once(1 div 0)', 'Infinity');
        });
    });

    it('does not evaluate when context node is not empty, but returns current value', () => {
        const node = doc.getElementById('FunctionSelectedCaseSingle');
        assertStringValue(node, null, 'once("aa")', 'ab');
    });
});