text: 'use strict';
  
  // Tests that attempting to send too many non-acknowledged
  // settings frames will result in a throw.
  
  const common = require('../common');
  if (!common.hasCrypto)
    common.skip('missing crypto');
  const assert = require('assert');
  const h2 = require('http2');
  
  const maxPendingAck = 2;
  const server = h2.createServer({ maxPendingAck: maxPendingAck + 1 });
  
  let clients = 2;
  
  function doTest(session) {
    for (let n = 0; n < maxPendingAck; n++)
      assert.doesNotThrow(() => session.settings({ enablePush: false }));
    assert.throws(() => session.settings({ enablePush: false }),
                  common.expectsError({
                    code: 'ERR_HTTP2_MAX_PENDING_SETTINGS_ACK',
                    type: Error
                  }));
  }
  
  server.on('stream', common.mustNotCall());
  
  server.once('session', common.mustCall((session) => doTest(session)));
  
  server.listen(0);
  
  const closeServer = common.mustCall(() => {
    if (--clients === 0)
      server.close();
  }, clients);
  
  server.on('listening', common.mustCall(() => {
    const client = h2.connect(`http://localhost:${server.address().port}`,
                              { maxPendingAck: maxPendingAck + 1 });
    let remaining = maxPendingAck + 1;
  
    client.on('close', closeServer);
    client.on('localSettings', common.mustCall(() => {
      if (--remaining <= 0) {
        client.destroy();
      }
    }, maxPendingAck + 1));
    client.on('connect', common.mustCall(() => doTest(client)));
  }));
  
  // Setting maxPendingAck to 0, defaults it to 1
  server.on('listening', common.mustCall(() => {
    const client = h2.connect(`http://localhost:${server.address().port}`,
                              { maxPendingAck: 0 });
  
    client.on('close', closeServer);
    client.on('localSettings', common.mustCall(() => {
      client.destroy();
    }));
  }));
  