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

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

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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 ProjectedDocumentExprStr = require('../../../lib/DevAPI/ProjectedDocumentExprStr');

describe('ProjectedDocumentExprStr 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.PROJECTED_SEARCH_EXPR })).thenReturn({ parse });

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

    context('getValue()', () => {
        it('returns a parsed version of a projection expression using the default alias if one is not provided', () => {
            const projectedDocumentExpr = 'foo';
            const getExpressionString = () => projectedDocumentExpr;
            const source = { type: 'bar' };
            const expected = { source, alias: projectedDocumentExpr };

            td.when(Expr({ value: projectedDocumentExpr })).thenReturn({ getExpressionString });
            td.when(parse(projectedDocumentExpr)).thenReturn({ source });

            expect(ProjectedDocumentExprStr(projectedDocumentExpr).getValue()).to.deep.equal(expected);
        });

        it('returns a parsed version of a projection expression using a custom alias', () => {
            const alias = 'foo';
            const projectedDocumentExpr = 'bar';
            const getExpressionString = () => projectedDocumentExpr;
            const source = { type: 'baz' };
            const expected = { source, alias };

            td.when(Expr({ value: projectedDocumentExpr })).thenReturn({ getExpressionString });
            td.when(parse(projectedDocumentExpr)).thenReturn({ source, alias });

            expect(ProjectedDocumentExprStr(projectedDocumentExpr).getValue()).to.deep.equal(expected);
        });

        it('returns a parsed version of computed projection expression without any alias', () => {
            const projectedDocumentExpr = 'foo';
            const getExpressionString = () => projectedDocumentExpr;
            const source = { type: 'jsonDoc' };
            const expected = { source };

            td.when(Expr({ value: projectedDocumentExpr })).thenReturn({ getExpressionString });
            td.when(parse(projectedDocumentExpr)).thenReturn({ source });

            expect(ProjectedDocumentExprStr(projectedDocumentExpr).getValue()).to.deep.equal(expected);
        });
    });
});