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pad_left.js
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48 lines (44 loc) · 1.71 KB
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import { PRINTABLE_ASCII } from '../const';
import v from '../voca';
describe('padLeft', function() {
it('should left pad a string', function() {
expect(v.padLeft('FF', 4, '0')).toBe('00FF');
expect(v.padLeft('00FF', 4, '0')).toBe('00FF');
expect(v.padLeft('ab', 10, '012')).toBe('01201201ab');
expect(v.padLeft('0', 5, '0')).toBe('00000');
expect(v.padLeft('', 10, '01')).toBe('0101010101');
expect(v.padLeft('Hello World')).toBe('Hello World');
expect(v.padLeft('Hello World', 20, '')).toBe('Hello World');
expect(v.padLeft('Welcome', 10)).toBe(' Welcome');
expect(v.padLeft('Alien', 10, '-=')).toBe('-=-=-Alien');
expect(v.padLeft(PRINTABLE_ASCII)).toBe(PRINTABLE_ASCII);
expect(v.padLeft(PRINTABLE_ASCII, PRINTABLE_ASCII.length + 3, '--')).toBe('---' + PRINTABLE_ASCII);
expect(v.padLeft('')).toBe('');
expect(v.padLeft('', 0)).toBe('');
});
it('should not modify the string when pad length is less than string length', function() {
expect(v.padLeft('Hello World', 0, ' ')).toBe('Hello World');
expect(v.padLeft('Hello World', 5, ' ')).toBe('Hello World');
expect(v.padLeft('0', 0, ' ')).toBe('0');
expect(v.padLeft('123', -1, ' ')).toBe('123');
});
it('should left pad a string representation of an object', function() {
expect(v.padLeft(['Welcome'], 9)).toBe(' Welcome');
expect(
v.padLeft(
{
toString: function() {
return 'great';
},
},
10,
'-'
)
).toBe('-----great');
});
it('should return an empty string for null or undefined', function() {
expect(v.padLeft()).toBe('');
expect(v.padLeft(undefined)).toBe('');
expect(v.padLeft(null)).toBe('');
});
});