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@mattmccray
Last active Jan 15, 2021
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MUTT - Micro Unit Testing Tool (for browsers)
// MUTT - Micro Unit Testing Tool (for browsers)
let _testDepth = 0;
export function test(name, suite) {
const title = `🐶 ${name}`;
const ctx = {
count: 0,
failed: 0
};
_testDepth++;
if (_testDepth > 1) console.group(title);
else console.groupCollapsed(title);
try {
suite({
equal(actual, expected, message) {
assert(ctx, actual == expected, message);
},
notEqual(actual, expected, message) {
assert(ctx, actual != expected, message);
},
fail(message) {
assert(ctx, false, message);
},
ok(actual, message) {
assert(ctx, actual, message);
},
notOk(actual, message) {
assert(ctx, !actual, message);
},
is(actual, expected, message) {
assert(ctx, actual === expected, message);
},
isNot(actual, expected, message) {
assert(ctx, actual !== expected, message);
},
throws(block, message) {
assertException(ctx, block, message, true);
},
doesNotThrow(block, message) {
assertException(ctx, block, message, false);
}
});
} catch (err) {
console.error("Error running tests:", err);
}
if (ctx.count > 0) {
if (ctx.failed === 0)
console.log(`✅ ${ctx.count} of ${ctx.count} succeeded.`);
else console.log(`💥 ${ctx.failed} of ${ctx.count} failed.`);
}
console.groupEnd(title);
if (ctx.failed > 0) console.log(`🚨 ${name}: ${ctx.failed} Failure(s)`);
_testDepth--;
}
function assertException(ctx, block, message, expectsThrow) {
let threw = false;
try {
block();
} catch (err) {
threw = true;
}
assert(ctx, threw === expectsThrow, message);
}
function assert(ctx, assertion, message) {
ctx.count++;
console.assert(assertion, message);
if (!assertion) ctx.failed++;
else console.info(message);
}
export default test;
// Quick self-test
test("MUTT", (t) => {
test("Setup", () => {
const methods = Object.keys(t).sort().join(",");
t.equal(
methods,
"doesNotThrow,equal,fail,is,isNot,notEqual,notOk,ok,throws",
"Provides all assertion methods."
);
});
test("Assertions", () => {
t.ok(true, "ok(true)");
t.notOk(false, "notOk(false)");
t.equal(1, 1, "equal(1,1)");
t.equal(1, "1", "equal(1,'1')");
t.notEqual(1, 2, "notEqual(1,2)");
t.is(1, 1, "is(1,1)");
t.isNot(1, 2, "isNot(1,2)");
t.isNot(1, "1", "isNot(1,'1')");
t.doesNotThrow(() => {
// Nothing to see here
}, "doesNotThrow(() => {})");
t.throws(() => {
throw new Error("There was an error.");
}, "throws(() => {})");
// t.fail("Force a failure.");
});
});
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