test.js

'use strict';

// MODULES //

var tape = require( 'tape' );
var isDigitString = require( './../lib' );


// TESTS //

tape( 'main export is a function', function test( t ) {
	t.ok( true, __filename );
	t.strictEqual( typeof isDigitString, 'function', 'main export is a function' );
	t.end();
});

tape( 'the function returns `true` if provided a string containing all numeric digits', function test( t ) {
	t.strictEqual( isDigitString( '0123456789' ), true, 'returns true' );
	t.end();
});

tape( 'the function returns `false` if not provided a string containing all numeric digits', function test( t ) {
	var values;
	var i;

	values = [
		'',
		'È',
		'a',
		'b',
		'c',
		'd',
		'e',
		'f',
		'g',
		'h',
		'i',
		'j',
		'k',
		'l',
		'm',
		'n',
		'o',
		'p',
		'q',
		'r',
		's',
		't',
		'u',
		'v',
		'w',
		'x',
		'y',
		'z',
		'A',
		'B',
		'C',
		'D',
		'E',
		'F',
		'G',
		'H',
		'I',
		'J',
		'K',
		'L',
		'M',
		'N',
		'O',
		'P',
		'Q',
		'R',
		'S',
		'T',
		'U',
		'V',
		'W',
		'X',
		'Y',
		'Z',
		new String( '0123456789' ), // eslint-disable-line no-new-wrappers
		5,
		null,
		NaN,
		undefined,
		true,
		[],
		{},
		function noop() {}
	];

	for ( i = 0; i < values.length; i++ ) {
		t.strictEqual( isDigitString( values[i] ), false, 'returns false when provided ' + values[i] );
	}
	t.end();
});