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var Scanner = require('../lib/DxfArrayScanner.js');
require('should');
describe('Scanner', function() {
describe('.hasNext()', function() {
it('should return false when the array is empty', function() {
var scanner = new Scanner([]);
scanner.hasNext().should.be.false;
});
it('should return false when the array has length 1', function() {
var scanner = new Scanner(['1']);
scanner.hasNext().should.be.false;
});
it('should return true when the array has length 2', function() {
var scanner = new Scanner(['1','2']);
scanner.hasNext().should.be.true;
});
it('should return false when the array has length 4 and pointer is on the last element', function() {
var scanner = new Scanner(['1','2','3','4']);
scanner._pointer = scanner._data.length - 1;
scanner.hasNext().should.be.false;
});
it('should return true when the array has length 4 and pointer is on the second-to-last element', function() {
var scanner = new Scanner(['1','2','3','4']);
scanner._pointer = scanner._data.length - 2;
scanner.hasNext().should.be.true;
});
});
describe('.next()', function() {
it('should throw an error when the array is empty', function() {
var scanner = new Scanner([]);
scanner.next.bind(scanner).should.throw(/Unexpected end of input/);
});
it('should throw an error when the array has only 1 element', function() {
var scanner = new Scanner(['1']);
scanner.next.bind(scanner).should.throw(/Unexpected end of input/);
});
it('should throw an error when next is called and eof has already been read', function(){
var scanner = new Scanner(['1','2']);
scanner._eof = true;
scanner.next.bind(scanner).should.throw(/Cannot call \'next\' after EOF/);
});
it('should return the 1st and 2nd index as the code and value respectively', function() {
var scanner = new Scanner(['1','2']);
var result = scanner.next();
result.should.eql({ code: 1, value: '2'});
});
it('should set _eof to true when EOF code-value pair is read', function() {
var scanner = new Scanner(['0','EOF']);
scanner.next();
scanner._eof.should.be.true;
});
it('should increment the pointer by 2', function() {
var scanner = new Scanner(['1','2']);
scanner.next();
scanner._pointer.should.eql(2);
});
});
describe('.isEOF()', function() {
it('should be true when _eof is true', function() {
var scanner = new Scanner(['0','EOF']);
scanner._eof = true;
scanner.isEOF().should.be.true;
});
});
});