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

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

/*
 * Copyright (c) 2022, Oracle and/or its affiliates.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License, version 2.0, as
 * published by the Free Software Foundation.
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 * as designated in a particular file or component or in included license
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 * WITHOUT ANY WARRANTY; without even the implied warranty of
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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 TableField = require('../../../lib/DevAPI/TableField');

describe('TableField 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.COLUMN_IDENT })).thenReturn({ parse });

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

    context('getValue()', () => {
        it('parses and returns a document path string', () => {
            const tableField = 'foo';
            const exprString = 'bar';
            const getExpressionString = () => exprString;
            const parsedExprStringValue = 'baz';
            const parsedExprString = { value: parsedExprStringValue };

            td.when(Expr({ value: tableField })).thenReturn({ getExpressionString });
            td.when(parse(exprString)).thenReturn(parsedExprString);

            return expect(TableField(tableField).getValue()).to.equal(parsedExprStringValue);
        });
    });
});