Do not test code anymore

test.js

@@ -364,14 +364,14 @@ test('result.signal is undefined if process failed, but was not killed', async t
 	t.is(signal, undefined);
 });
 
-async function code(t, num) {
+async function testExitCode(t, num) {
 	const {exitCode} = await t.throwsAsync(execa('exit', [`${num}`]), {code: num, message: getExitRegExp(num)});
 	t.is(exitCode, num);
 }
 
-test('error.code is 2', code, 2);
-test('error.code is 3', code, 3);
-test('error.code is 4', code, 4);
+test('error.exitCode is 2', testExitCode, 2);
+test('error.exitCode is 3', testExitCode, 3);
+test('error.exitCode is 4', testExitCode, 4);
 
 test('timeout kills the process if it times out', async t => {
 	const {killed, timedOut} = await t.throwsAsync(execa('forever', {timeout: 1, message: TIMEOUT_REGEXP}));