@stryker-mutator/core/dist/test/unit/utils/string-builder.spec.js

The extendable JavaScript mutation testing framework

import { EOL } from 'os';
import { expect } from 'chai';
import { StringBuilder } from '../../../src/utils/string-builder.js';
describe(StringBuilder.name, () => {
    describe('toString', () => {
        it('should append strings without separator when `toString()` is called', () => {
            const sut = new StringBuilder();
            sut.append('1');
            sut.append('2');
            sut.append('3');
            expect(sut.toString()).eq('123');
        });
        const DEFAULT_MAX_CHARACTERS = 2048;
        it(`should append a to maximum of ${DEFAULT_MAX_CHARACTERS} characters by default`, () => {
            const sut = new StringBuilder();
            for (let i = 0; i < DEFAULT_MAX_CHARACTERS; i++) {
                sut.append('.');
            }
            sut.append('expected');
            const result = sut.toString();
            expect(result).lengthOf(DEFAULT_MAX_CHARACTERS);
            const expectedLastPart = '...expected';
            expect(result.substr(result.length - expectedLastPart.length)).eq(expectedLastPart);
        });
        it('should not split the last string, even if it exceeds the max characters', () => {
            const input = new Array(DEFAULT_MAX_CHARACTERS + 1).fill('.').join('');
            const sut = new StringBuilder();
            sut.append(input);
            expect(sut.toString()).eq(input);
        });
    });
    describe('concat', () => {
        it('should concatenate multiple string builders with new lines', () => {
            const stringBuilders = [new StringBuilder(), new StringBuilder()];
            stringBuilders[0].append('foo');
            stringBuilders[0].append('bar');
            stringBuilders[1].append('baz');
            expect(StringBuilder.concat(...stringBuilders)).eq(`foobar${EOL}baz`);
        });
        it('should remove empty builders', () => {
            const stringBuilders = [new StringBuilder(), new StringBuilder(), new StringBuilder()];
            stringBuilders[0].append('foo');
            stringBuilders[0].append('bar');
            stringBuilders[2].append('baz');
            expect(StringBuilder.concat(...stringBuilders)).eq(`foobar${EOL}baz`);
        });
    });
});
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