0.0.1

node_modules/streamx/test/backpressure.js

@@ -0,0 +1,105 @@
+const tape = require('tape')
+const { Writable, Readable } = require('../')
+
+tape('write backpressure', function (t) {
+  const ws = new Writable()
+
+  for (let i = 0; i < 15; i++) {
+    t.ok(ws.write('a'), 'not backpressured')
+    t.notOk(Writable.isBackpressured(ws), 'static check')
+  }
+
+  t.notOk(ws.write('a'), 'backpressured')
+  t.ok(Writable.isBackpressured(ws), 'static check')
+
+  t.end()
+})
+
+tape('write backpressure with drain', function (t) {
+  const ws = new Writable()
+
+  for (let i = 0; i < 15; i++) {
+    t.ok(ws.write('a'), 'not backpressured')
+    t.notOk(Writable.isBackpressured(ws), 'static check')
+  }
+
+  t.notOk(ws.write('a'), 'backpressured')
+  t.ok(Writable.isBackpressured(ws), 'static check')
+
+  ws.on('drain', function () {
+    t.notOk(Writable.isBackpressured(ws))
+    t.end()
+  })
+})
+
+tape('write backpressure with destroy', function (t) {
+  const ws = new Writable()
+
+  ws.write('a')
+  ws.destroy()
+
+  t.ok(Writable.isBackpressured(ws))
+  t.end()
+})
+
+tape('write backpressure with end', function (t) {
+  const ws = new Writable()
+
+  ws.write('a')
+  ws.end()
+
+  t.ok(Writable.isBackpressured(ws))
+  t.end()
+})
+
+tape('read backpressure', function (t) {
+  const rs = new Readable()
+
+  for (let i = 0; i < 15; i++) {
+    t.ok(rs.push('a'), 'not backpressured')
+    t.notOk(Readable.isBackpressured(rs), 'static check')
+  }
+
+  t.notOk(rs.push('a'), 'backpressured')
+  t.ok(Readable.isBackpressured(rs), 'static check')
+
+  t.end()
+})
+
+tape('read backpressure with later read', function (t) {
+  const rs = new Readable()
+
+  for (let i = 0; i < 15; i++) {
+    t.ok(rs.push('a'), 'not backpressured')
+    t.notOk(Readable.isBackpressured(rs), 'static check')
+  }
+
+  t.notOk(rs.push('a'), 'backpressured')
+  t.ok(Readable.isBackpressured(rs), 'static check')
+
+  rs.once('readable', function () {
+    rs.read()
+    t.notOk(Readable.isBackpressured(rs))
+    t.end()
+  })
+})
+
+tape('read backpressure with destroy', function (t) {
+  const rs = new Readable()
+
+  rs.push('a')
+  rs.destroy()
+
+  t.ok(Readable.isBackpressured(rs))
+  t.end()
+})
+
+tape('read backpressure with push(null)', function (t) {
+  const rs = new Readable()
+
+  rs.push('a')
+  rs.push(null)
+
+  t.ok(Readable.isBackpressured(rs))
+  t.end()
+})