Bring back tests for custom errors

test/index.js

@@ -216,6 +216,46 @@ test('send(200, <Stream>) with error on same tick', async t => {
   }
 })
 
+test('custom error', async t => {
+  const fn = () => {
+    sleep(50)
+    throw new Error('500 from test (expected)')
+  }
+
+  const handleErrors = fn => (req, res) => {
+    try {
+      return fn(req, res)
+    } catch (err) {
+      send(res, 200, 'My custom error!')
+    }
+  }
+
+  const url = await listen(handleErrors(fn))
+  const res = await request(url)
+
+  t.deepEqual(res, 'My custom error!')
+})
+
+test('custom async error', async t => {
+  const fn = async () => {
+    sleep(50)
+    throw new Error('500 from test (expected)')
+  }
+
+  const handleErrors = fn => async (req, res) => {
+    try {
+      return await fn(req, res)
+    } catch (err) {
+      send(res, 200, 'My custom error!')
+    }
+  }
+
+  const url = await listen(handleErrors(fn))
+  const res = await request(url)
+
+  t.deepEqual(res, 'My custom error!')
+})
+
 test('json parse error', async t => {
   const fn = async (req, res) => {
     const body = await json(req)