Mocking SuiteScript Properties in Unit Tests
To mock a SuiteScript property, set the value of the property to an arbitrary value in your test file. For best practice, you'll want to use a valid value type that's accepted for the SuiteScript property used. For example, the Record.type property accepts string values, so your mocked value should be a string.
describe('Mocking SuiteScript dependencies', () => {
it('Should mock Suitescript property', () => {
// given
record.create.mockReturnValue(Record);
Record.type = 'salesorder';
});
});