@mysql/xdevapi/test/unit/DevAPI/ExprOrLiteral.js

MySQL Connector/Node.js - A Node.js driver for MySQL using the X Protocol and X DevAPI.

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 * This program is free software; you can redistribute it and/or modify
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'use strict';

/* eslint-env node, mocha */

const expect = require('chai').expect;
const td = require('testdouble');

// subject under test needs to be reloaded with test doubles
let ExprOrLiteral = require('../../../lib/DevAPI/ExprOrLiteral');

describe('ExprOrLiteral informal type', () => {
    let Expr, ExprParser, parse;

    beforeEach('replace dependencies with test doubles', () => {
        Expr = td.replace('../../../lib/DevAPI/Expr');
        ExprParser = td.replace('../../../lib/ExprParser');
        parse = td.function();

        td.when(ExprParser({ type: ExprParser.Type.DOCUMENT_FIELD })).thenReturn({ parse });

        // reload module with the replacements
        ExprOrLiteral = require('../../../lib/DevAPI/ExprOrLiteral');
    });

    context('getValue()', () => {
        it('returns the value when it is a literal', () => {
            const dataModel = 'foo';
            const literal = 'bar';

            const exprOrLiteral = ExprOrLiteral({ dataModel, value: literal });
            const isLiteral = td.replace(exprOrLiteral, 'isLiteral');

            td.when(isLiteral()).thenReturn(true);

            return expect(exprOrLiteral.getValue()).to.equal(literal);
        });

        it('parses the value as an expression when it is not a literal', () => {
            const dataModel = 'foo';
            const nonLiteral = 'bar';
            const parsedExprString = 'baz';
            const getValue = () => parsedExprString;

            const exprOrLiteral = ExprOrLiteral({ dataModel, value: nonLiteral });
            const isLiteral = td.replace(exprOrLiteral, 'isLiteral');

            td.when(isLiteral()).thenReturn(false);
            td.when(Expr({ dataModel, value: nonLiteral })).thenReturn({ getValue });

            return expect(exprOrLiteral.getValue()).to.equal(parsedExprString);
        });
    });

    context('isLiteral()', () => {
        it('checks if the value is a literal from the expression standpoint', () => {
            const dataModel = 'foo';
            const isLiteral = td.function();
            const value = 'bar';

            td.when(Expr({ dataModel, value })).thenReturn({ isLiteral });
            td.when(isLiteral()).thenReturn(true);

            // eslint-disable-next-line no-unused-expressions
            expect(ExprOrLiteral({ dataModel, value }).isLiteral()).to.be.true;

            td.when(isLiteral()).thenReturn(false);
            return expect(ExprOrLiteral({ dataModel, value }).isLiteral()).to.be.false;
        });
    });
});