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152 lines (149 loc) · 4.23 KB
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var test = require('../util/test')(__filename);
var leftPad = require('../../packages/string-left-pad');
test('left pad with default pad character', function(t1) {
test('strings with sufficient padding', function(t) {
t.plan(2);
t.equal(leftPad('hello', 9), ' hello');
t.equal(leftPad('a', 2), ' a');
t.end();
});
test('strings with insufficient padding', function(t) {
t.plan(2);
t.equal(leftPad('hello', 3), 'hello');
t.equal(leftPad('a', 1), 'a');
t.end();
});
test('empty string arg', function(t) {
t.plan(1);
t.equal(leftPad('', 4), ' ');
t.end();
});
test('zero length arg', function(t) {
t.plan(2);
t.equal(leftPad('hello', 0), 'hello');
t.equal(leftPad('', 0), '');
t.end();
});
test('strings with surrogate pairs', function(t) {
t.plan(2);
t.equal(leftPad('\uD83D\uDC04\uD83D\uDC04', 9), ' 🐄🐄');
t.equal(leftPad('\uD83D\uDC04\u00F6\u00F6\uD83D\uDC04', 9), ' 🐄öö🐄');
t.end();
});
t1.end();
test('first argument must be a string', function(t) {
t.plan(2);
t.throws(function() {
leftPad(['hello'], 8);
});
t.throws(function() {
leftPad(27, 9);
});
t.end();
});
test('second argument must be a positive finite integer', function(t) {
t.plan(5);
t.throws(function() {
leftPad('hello', '4');
});
t.throws(function() {
leftPad('hello', NaN);
});
t.throws(function() {
leftPad('hello', Number.POSITIVE_INFINITY);
});
t.throws(function() {
leftPad('hello', -1);
});
t.throws(function() {
leftPad('hello', 4.3);
});
t.end();
});
});
test('left pad with custom pad character', function(t2) {
test('strings with sufficient padding', function(t) {
t.plan(2);
t.equal(leftPad('hello', 9, '.'), '....hello');
t.equal(leftPad('a', 2, '_'), '_a');
t.end();
});
test('empty padding string treated as a space', function(t) {
t.plan(1);
t.equal(leftPad('no-pad', 12, ''), ' no-pad');
t.end();
});
test('strings with insufficient padding', function(t) {
t.plan(3);
t.equal(leftPad('hello', 3, '.'), 'hello');
t.equal(leftPad('a', 1, '_'), 'a');
t.equal(leftPad('no-pad', 4, ''), 'no-pad');
t.end();
});
test('empty string arg', function(t) {
t.plan(1);
t.equal(leftPad('', 4, '.'), '....');
t.end();
});
test('zero length arg', function(t) {
t.plan(2);
t.equal(leftPad('hello', 0, '.'), 'hello');
t.equal(leftPad('', 0, '.'), '');
t.end();
});
test('surrogate pairs as pad chars', function(t) {
t.plan(2);
t.equal(leftPad('hello', 9, '\uD83D\uDC04'), '🐄🐄🐄🐄hello');
t.equal(leftPad('hello', 6, '\uD83D\uDC11'), '🐑hello');
t.end();
});
test('pad argument must be a string', function(t) {
t.plan(2);
t.throws(function() {
leftPad('hello', 9, false);
});
t.throws(function() {
leftPad('hello', 12, 31);
});
t.end();
});
t2.end();
});
test('left pad with multiple custom pad characters', function(t3) {
test('strings with sufficient padding', function(t) {
t.plan(4);
t.equal(leftPad('hello', 9, '..'), '....hello');
t.equal(leftPad('hello', 8, '..'), '...hello');
t.equal(leftPad('hello', 9, 'ab'), 'ababhello');
t.equal(leftPad('hello', 8, 'ab'), 'babhello');
t.end();
});
test('strings with insufficient padding', function(t) {
t.plan(3);
t.equal(leftPad('hello', 3, '..'), 'hello');
t.equal(leftPad('a', 1, 'ab'), 'a');
t.equal(leftPad('no-pad', 4, '**'), 'no-pad');
t.end();
});
test('empty string arg', function(t) {
t.plan(3);
t.equal(leftPad('', 4, '..'), '....');
t.equal(leftPad('', 3, '..'), '...');
t.equal(leftPad('', 3, 'ab'), 'bab');
t.end();
});
test('surrogate pairs as pad chars', function(t) {
t.plan(2);
t.equal(leftPad('hello', 9, '\uD83D\uDC11\uD83D\uDC04'), '🐑🐄🐑🐄hello');
t.equal(leftPad('hello', 10, '\uD83D\uDC11\uD83D\uDC04'), '🐄🐑🐄🐑🐄hello');
t.end();
});
test("padding can't mix regular characters and surrogate pairs", function(t) {
t.plan(1);
t.throws(function() {
leftPad('hello', 9, 'o0053\uD83D\uDC04');
});
t.end();
});
t3.end();
});