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test/parallel/test-http-outgoing-buffer.js

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+// Flags: --expose-internals
+'use strict';
+require('../common');
+const assert = require('assert');
+const { getDefaultHighWaterMark } = require('internal/streams/state');
+
+const http = require('http');
+const OutgoingMessage = http.OutgoingMessage;
+
+const msg = new OutgoingMessage();
+msg._implicitHeader = function() {};
+
+// Writes should be buffered until highwatermark
+// even when no socket is assigned.
+
+assert.strictEqual(msg.write('asd'), true);
+while (msg.write('asd'));
+const highwatermark = msg.writableHighWaterMark || getDefaultHighWaterMark();
+assert(msg.outputSize >= highwatermark);