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JavaScript unit testing in under 30 lines
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const PASS = ['32']; // green | |
const FAIL = ['31', '1']; // red, bold | |
function logStyle(ansiEscapeCodes, text) { | |
console.log(`\x1b[${ansiEscapeCodes.join(';')}m${text}\x1b[0m`); | |
} | |
class Tester { | |
constructor() {} | |
test(name, fn) { | |
try { | |
fn.bind(this)(); | |
logStyle(PASS, `${name} PASSED`); | |
} | |
catch (e) { | |
logStyle(FAIL, `${name} FAILED: | |
${e}`); | |
} | |
} | |
assertEquals(arg1, arg2) { | |
if (arg1 != arg2) throw new Error(`Expected ${arg1} to equal ${arg2}`); | |
} | |
assert(condition) { | |
if (!condition) throw new Error(`Expected ${condition} to be truthy`); | |
} | |
} | |
/* | |
Usage: | |
const t = new Tester(); | |
t.test('testName', () => { | |
t.assertEquals('dog'.length, 3); // will pass | |
}); | |
t.test('anotherTestName', () => { | |
t.assert(false); // will fail | |
}); | |
*/ |
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