diff --git a/src/index.js b/src/index.js
index 2a6301d..ced88a8 100644
--- a/src/index.js
+++ b/src/index.js
@@ -125,10 +125,12 @@ function setup(ctx, name = '') {
 export const suite = (name = '', state = {}) => setup(context(state), name);
 export const test = suite();
 
+let isRunning = false;
 export async function exec(bail) {
 	let timer = hrtime();
 	let done=0, total=0, skips=0, code=0;
 
+	isRunning = true;
 	for (let group of UVU_QUEUE) {
 		if (total) write('\n');
 
@@ -145,6 +147,7 @@ export async function exec(bail) {
 		}
 	}
 
+	isRunning = false;
 	write('\n  Total:     ' + total);
 	write((code ? kleur.red : kleur.green)('\n  Passed:    ' + done));
 	write('\n  Skipped:   ' + (skips ? kleur.yellow(skips) : skips));
@@ -152,3 +155,9 @@ export async function exec(bail) {
 
 	if (isNode) process.exitCode = code;
 }
+
+if (isNode) process.on('exit', () => {
+	if (!isRunning) return; // okay to exit
+	process.exitCode = process.exitCode || 1;
+	console.error('Exiting early before testing is finished.');
+});
diff --git a/test/exit.fails.js b/test/exit.fails.js
new file mode 100644
index 0000000..8402c7e
--- /dev/null
+++ b/test/exit.fails.js
@@ -0,0 +1,17 @@
+import { test } from 'uvu';
+
+// TODO: test.fail() modifier (see #47)
+
+// A test that calls process.exit must fail (even if it exits with 0).
+// Otherwise all tests might not run, or even all assertions within test.
+test('should fail if `process.exit` encountered', async () => {
+  process.exit(0);
+});
+
+// This promise will never resolve & the process will exit early.
+// This must fail, otherwise all tests/assertions might not run.
+test('should fail if Promise never resolves :: GC', async () => {
+  await new Promise(() => {});
+});
+
+test.run();
diff --git a/test/index.js b/test/index.js
index 3248360..a85dbdb 100644
--- a/test/index.js
+++ b/test/index.js
@@ -14,6 +14,22 @@ totalist(__dirname, (rel, abs) => {
 	let pid = spawnSync('node', HOOK.concat(abs));
 	let file = kleur.bold().underline(rel);
 
+	if (rel.endsWith('.fails.js')) {
+		try {
+			assert.notEqual(pid.status, 0, 'expected to fail');
+			assert.equal(pid.stderr.length > 0, true, 'run w/ stderr');
+			assert.equal(pid.stdout.length, 0, 'run w/o stdout');
+			console.log(PASS + file);
+		} catch (err) {
+			console.error(FAIL + file + ' :: "%s"', err.message);
+			if (pid.stdout.length) {
+				console.error(LEFT + '\n' + LEFT + pid.stdout.toString().replace(/(\r?\n)/g, '$1' + LEFT));
+			}
+			code = 1;
+		}
+		return;
+	}
+
 	try {
 		assert.equal(pid.status, 0, 'run w/o error code');
 		assert.equal(pid.stderr.length, 0, 'run w/o stderr');