test: fix flaky test-http2-invalidheaderfield

Separate test cases to avoid side effects and race conditions.

Fixes: #34172

PR-URL: #34173
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Andrey Pechkurov <apechkurov@gmail.com>

Author: Trott

test/parallel/test-http2-invalidheaderfield.js

@@ -10,56 +10,77 @@ if (!common.hasCrypto) { common.skip('missing crypto'); }
 const http2 = require('http2');
 const { throws, strictEqual } = require('assert');
 
-const server = http2.createServer(common.mustCall((req, res) => {
-  throws(() => {
-    res.setHeader(':path', '/');
-  }, {
-    code: 'ERR_HTTP2_PSEUDOHEADER_NOT_ALLOWED'
-  });
-  throws(() => {
-    res.setHeader('t est', 123);
-  }, {
-    code: 'ERR_INVALID_HTTP_TOKEN'
-  });
-  res.setHeader('TEST', 123);
-  res.setHeader('test_', 123);
-  res.setHeader(' test', 123);
-  res.end();
-}));
+{
+  const server = http2.createServer(common.mustCall((req, res) => {
+    throws(() => {
+      res.setHeader(':path', '/');
+    }, {
+      code: 'ERR_HTTP2_PSEUDOHEADER_NOT_ALLOWED'
+    });
+    throws(() => {
+      res.setHeader('t est', 123);
+    }, {
+      code: 'ERR_INVALID_HTTP_TOKEN'
+    });
+    res.setHeader('TEST', 123);
+    res.setHeader('test_', 123);
+    res.setHeader(' test', 123);
+    res.end();
+  }));
+
+  server.listen(0, common.mustCall(() => {
+    const session = http2.connect(`http://localhost:${server.address().port}`);
+    session.request({ 'test_': 123, 'TEST': 123 })
+      .on('end', common.mustCall(() => {
+        session.close();
+        server.close();
+      }));
+  }));
+}
 
-server.listen(0, common.mustCall(() => {
-  const session1 = http2.connect(`http://localhost:${server.address().port}`);
-  session1.request({ 'test_': 123, 'TEST': 123 })
-    .on('end', common.mustCall(() => {
-      session1.close();
+{
+  const server = http2.createServer();
+  server.listen(0, common.mustCall(() => {
+    const session = http2.connect(`http://localhost:${server.address().port}`);
+    session.on('error', common.mustCall((e) => {
+      strictEqual(e.code, 'ERR_INVALID_HTTP_TOKEN');
       server.close();
     }));
-
-  const session2 = http2.connect(`http://localhost:${server.address().port}`);
-  session2.on('error', common.mustCall((e) => {
-    strictEqual(e.code, 'ERR_INVALID_HTTP_TOKEN');
+    throws(() => {
+      session.request({ 't est': 123 });
+    }, {
+      code: 'ERR_INVALID_HTTP_TOKEN'
+    });
   }));
-  throws(() => {
-    session2.request({ 't est': 123 });
-  }, {
-    code: 'ERR_INVALID_HTTP_TOKEN'
-  });
+}
 
-  const session3 = http2.connect(`http://localhost:${server.address().port}`);
-  session3.on('error', common.mustCall((e) => {
-    strictEqual(e.code, 'ERR_INVALID_HTTP_TOKEN');
+
+{
+  const server = http2.createServer();
+  server.listen(0, common.mustCall(() => {
+    const session = http2.connect(`http://localhost:${server.address().port}`);
+    session.on('error', common.mustCall((e) => {
+      strictEqual(e.code, 'ERR_INVALID_HTTP_TOKEN');
+      server.close();
+    }));
+    throws(() => {
+      session.request({ ' test': 123 });
+    }, {
+      code: 'ERR_INVALID_HTTP_TOKEN'
+    });
   }));
-  throws(() => {
-    session3.request({ ' test': 123 });
-  }, {
-    code: 'ERR_INVALID_HTTP_TOKEN'
-  });
+}
 
-  const session4 = http2.connect(`http://localhost:${server.address().port}`);
-  throws(() => {
-    session4.request({ ':test': 123 });
-  }, {
-    code: 'ERR_HTTP2_INVALID_PSEUDOHEADER'
-  });
-  session4.close();
-}));
+{
+  const server = http2.createServer();
+  server.listen(0, common.mustCall(() => {
+    const session4 = http2.connect(`http://localhost:${server.address().port}`);
+    throws(() => {
+      session4.request({ ':test': 123 });
+    }, {
+      code: 'ERR_HTTP2_INVALID_PSEUDOHEADER'
+    });
+    session4.close();
+    server.close();
+  }));
+}