test(cli): http test reliability fixes (#21246)

cli/tests/unit/http_test.ts

@@ -1136,7 +1136,7 @@ Deno.test(
   { permissions: { net: true } },
   async function droppedConnSenderNoPanic() {
     async function server() {
-      const listener = Deno.listen({ port: 8000 });
+      const listener = Deno.listen({ port: listenPort });
       const conn = await listener.accept();
       const http = Deno.serveHttp(conn);
       const evt = await http.nextRequest();
@@ -1151,7 +1151,7 @@ Deno.test(
 
     async function client() {
       try {
-        const resp = await fetch("http://127.0.0.1:8000/");
+        const resp = await fetch(`http://127.0.0.1:${listenPort}/`);
         await resp.body?.cancel();
       } catch {
         // Ignore error

cli/tests/unit/serve_test.ts

@@ -3640,22 +3640,22 @@ Deno.test(
   async function httpServeCurlH2C() {
     const ac = new AbortController();
     const server = Deno.serve(
-      { signal: ac.signal },
+      { port: servePort, signal: ac.signal },
       () => new Response("hello world!"),
     );
 
     assertEquals(
       "hello world!",
-      await curlRequest(["http://localhost:8000/path"]),
+      await curlRequest([`http://localhost:${servePort}/path`]),
     );
     assertEquals(
       "hello world!",
-      await curlRequest(["http://localhost:8000/path", "--http2"]),
+      await curlRequest([`http://localhost:${servePort}/path`, "--http2"]),
     );
     assertEquals(
       "hello world!",
       await curlRequest([
-        "http://localhost:8000/path",
+        `http://localhost:${servePort}/path`,
         "--http2",
         "--http2-prior-knowledge",
       ]),
@@ -3712,6 +3712,7 @@ Deno.test(
     const server = Deno.serve(
       {
         signal: ac.signal,
+        port: servePort,
         cert: Deno.readTextFileSync("cli/tests/testdata/tls/localhost.crt"),
         key: Deno.readTextFileSync("cli/tests/testdata/tls/localhost.key"),
       },
@@ -3720,16 +3721,20 @@ Deno.test(
 
     assertEquals(
       "hello world!",
-      await curlRequest(["https://localhost:8000/path", "-k"]),
-    );
-    assertEquals(
-      "hello world!",
-      await curlRequest(["https://localhost:8000/path", "-k", "--http2"]),
+      await curlRequest([`https://localhost:${servePort}/path`, "-k"]),
     );
     assertEquals(
       "hello world!",
       await curlRequest([
-        "https://localhost:8000/path",
+        `https://localhost:${servePort}/path`,
+        "-k",
+        "--http2",
+      ]),
+    );
+    assertEquals(
+      "hello world!",
+      await curlRequest([
+        `https://localhost:${servePort}/path`,
         "-k",
         "--http2",
         "--http2-prior-knowledge",
@@ -3742,12 +3747,15 @@ Deno.test(
 );
 
 async function curlRequest(args: string[]) {
-  const { success, stdout } = await new Deno.Command("curl", {
+  const { success, stdout, stderr } = await new Deno.Command("curl", {
     args,
     stdout: "piped",
-    stderr: "null",
+    stderr: "piped",
   }).output();
-  assert(success);
+  assert(
+    success,
+    `Failed to cURL ${args}: stdout\n\n${stdout}\n\nstderr:\n\n${stderr}`,
+  );
   return new TextDecoder().decode(stdout);
 }
 
@@ -3757,7 +3765,10 @@ async function curlRequestWithStdErr(args: string[]) {
     stdout: "piped",
     stderr: "piped",
   }).output();
-  assert(success);
+  assert(
+    success,
+    `Failed to cURL ${args}: stdout\n\n${stdout}\n\nstderr:\n\n${stderr}`,
+  );
   return [new TextDecoder().decode(stdout), new TextDecoder().decode(stderr)];
 }