pegjs/test/spec/unit/compiler/passes/report-duplicate-rules.spec.js

"use strict";

const chai = require( "chai" );
const helpers = require( "./helpers" );
const pass = require( "pegjs-dev" ).compiler.passes.check.reportDuplicateRules;

chai.use( helpers );

const expect = chai.expect;

describe( "compiler pass |reportDuplicateRules|", function () {

    it( "reports duplicate rules", function () {

        expect( pass ).to.reportError( [
            "start = 'a'",
            "start = 'b'"
        ].join( "\n" ), {
            message: "Rule \"start\" is already defined at line 1, column 1.",
            location: {
                start: { offset: 12, line: 2, column: 1 },
                end: { offset: 23, line: 2, column: 12 }
            }
        } );

    } );

} );