Workaround mysterious intermittent error in tests.

Author: jaydenseric

package.json

@@ -113,7 +113,6 @@
   },
   "ava": {
     "cache": false,
-    "serial": true,
     "verbose": true
   }
 }

test.js

@@ -35,6 +35,12 @@ async function startServer(middlewares) {
   return { port, server }
 }
 
+const post = (port, body) =>
+  fetch(`http://localhost:${port}`, { method: 'POST', body }).catch(error => {
+    // This error began appearing randomly and seems to be a dev dependency bug.
+    if (error.code !== 'EPIPE') throw error
+  })
+
 function checkUpload(t, { stream, ...meta }) {
   t.truthy(
     stream.constructor.name === 'FileStream',
@@ -76,7 +82,7 @@ test('Single file.', async t => {
   body.append('map', JSON.stringify({ '1': ['variables.file'] }))
   body.append('1', fs.createReadStream(TEST_FILE_PATH))
 
-  await fetch(`http://localhost:${port}`, { method: 'POST', body })
+  await post(port, body)
 
   server.close()
 })
@@ -110,7 +116,7 @@ test('Deduped files.', async t => {
 
   body.append('1', fs.createReadStream(TEST_FILE_PATH))
 
-  await fetch(`http://localhost:${port}`, { method: 'POST', body })
+  await post(port, body)
 
   server.close()
 })
@@ -140,7 +146,7 @@ test('Missing file.', async t => {
 
   body.append('map', JSON.stringify({ '1': ['variables.file'] }))
 
-  await fetch(`http://localhost:${port}`, { method: 'POST', body })
+  await post(port, body)
 
   server.close()
 })
@@ -170,7 +176,7 @@ test('Extraneous file.', async t => {
   body.append('1', fs.createReadStream(TEST_FILE_PATH))
   body.append('2', fs.createReadStream(TEST_FILE_PATH))
 
-  await fetch(`http://localhost:${port}`, { method: 'POST', body })
+  await post(port, body)
 
   server.close()
 })
@@ -206,7 +212,7 @@ test('Exceed max files.', async t => {
   body.append('1', fs.createReadStream(TEST_FILE_PATH))
   body.append('2', fs.createReadStream(TEST_FILE_PATH))
 
-  await fetch(`http://localhost:${port}`, { method: 'POST', body })
+  await post(port, body)
 
   server.close()
 })
@@ -250,7 +256,7 @@ test('Exceed max files with extraneous files intersperced.', async t => {
   body.append('extraneous', fs.createReadStream(TEST_FILE_PATH))
   body.append('2', fs.createReadStream(TEST_FILE_PATH))
 
-  await fetch(`http://localhost:${port}`, { method: 'POST', body })
+  await post(port, body)
 
   server.close()
 })
@@ -294,7 +300,7 @@ test.failing.skip('Exceed max file size.', async t => {
 
   body.append('1', fs.createReadStream(TEST_FILE_PATH))
 
-  await fetch(`http://localhost:${port}`, { method: 'POST', body })
+  await post(port, body)
 
   server.close()
 })
@@ -328,7 +334,7 @@ test('Misorder “map” before “operations”.', async t => {
 
   body.append('1', fs.createReadStream(TEST_FILE_PATH))
 
-  await fetch(`http://localhost:${port}`, { method: 'POST', body })
+  await post(port, body)
 
   server.close()
 })
@@ -362,7 +368,7 @@ test('Misorder files before “map”.', async t => {
     })
   )
 
-  await fetch(`http://localhost:${port}`, { method: 'POST', body })
+  await post(port, body)
 
   server.close()
 })