test: test case for multiple res.writeHead and res.getHeader

Author: marco-ippolito

test/parallel/test-http-write-head-2.js

@@ -59,3 +59,63 @@ const http = require('http');
     }));
   }));
 }
+
+{
+  const server = http.createServer((req, res) => {
+    try {
+      res.writeHead(200,[ 'test', '1' ]);
+      res.writeHead(200,[ 'test2', '2' ]);
+      res.end();
+    } catch (error) {
+      assert.strictEqual(err.code, 'ERR_INVALID_ARG_VALUE');
+    }
+  });
+
+  server.listen(0, () => {
+    http.get({ port: server.address().port }, common.mustCall((res) => {
+      assert.equal('test' in res.headers, false)
+      assert.strictEqual(res.headers.test2, '2');
+      res.resume().on('end', common.mustCall(() => {
+        server.close();
+      }));
+    }));
+  });
+}
+
+{
+  const server = http.createServer((req, res) => {
+    res.writeHead(200,[ 'test', '1' ]);
+    assert.equal(res.getHeader('test'), undefined)
+    res.end();
+  });
+  
+  server.listen(0, () => {
+    http.get({ port: server.address().port }, (res) => {
+      assert.strictEqual(res.headers.test, '1');
+      res.resume().on('end', common.mustCall(() => {
+        server.close();
+      }));
+    });
+  });
+}
+
+{
+  const server = http.createServer((req, res) => {
+    res.setHeader('test2','2')
+    res.writeHead(200,[ 'test', '1' ]);
+    assert.strictEqual(res.getHeader('test'), '1');
+    assert.strictEqual(res.getHeader('test2'), '2');
+    res.end();
+  });
+  
+  server.listen(0, () => {
+    http.get({ port: server.address().port }, (res) => {
+      assert.strictEqual(res.headers.test, '1');
+      assert.strictEqual(res.headers.test2, '2');
+      res.resume().on('end', common.mustCall(() => {
+        server.close();
+      }));
+    });
+  });
+}
+