diff --git a/crates/cargo-test-support/src/registry.rs b/crates/cargo-test-support/src/registry.rs
index a9d458c04695..6b854855c362 100644
--- a/crates/cargo-test-support/src/registry.rs
+++ b/crates/cargo-test-support/src/registry.rs
@@ -261,6 +261,7 @@ impl RegistryBuilder {
             let server = HttpServer::new(
                 registry_path.clone(),
                 dl_path,
+                api_path.clone(),
                 token.clone(),
                 self.auth_required,
                 self.custom_responders,
@@ -585,6 +586,7 @@ pub struct HttpServer {
     listener: TcpListener,
     registry_path: PathBuf,
     dl_path: PathBuf,
+    api_path: PathBuf,
     addr: SocketAddr,
     token: Token,
     auth_required: bool,
@@ -604,6 +606,7 @@ impl HttpServer {
     pub fn new(
         registry_path: PathBuf,
         dl_path: PathBuf,
+        api_path: PathBuf,
         token: Token,
         auth_required: bool,
         api_responders: HashMap<
@@ -617,6 +620,7 @@ impl HttpServer {
             listener,
             registry_path,
             dl_path,
+            api_path,
             addr,
             token,
             auth_required,
@@ -1007,6 +1011,10 @@ impl HttpServer {
 
     pub fn check_authorized_publish(&self, req: &Request) -> Response {
         if let Some(body) = &req.body {
+            let path = self.api_path.join("api/v1/crates/new");
+            t!(fs::create_dir_all(path.parent().unwrap()));
+            t!(fs::write(&path, body));
+
             // Get the metadata of the package
             let (len, remaining) = body.split_at(4);
             let json_len = u32::from_le_bytes(len.try_into().unwrap());
diff --git a/tests/testsuite/alt_registry.rs b/tests/testsuite/alt_registry.rs
index 938d9f3895b7..2c4560be2e2c 100644
--- a/tests/testsuite/alt_registry.rs
+++ b/tests/testsuite/alt_registry.rs
@@ -429,7 +429,14 @@ fn publish_to_alt_registry() {
 
 #[cargo_test]
 fn publish_with_crates_io_dep() {
-    registry::alt_init();
+    // crates.io registry.
+    let _dummy_reg = registry::init();
+    // Alternative registry.
+    let _alt_reg = RegistryBuilder::new()
+        .http_api()
+        .http_index()
+        .alternative_named("alternative")
+        .build();
     let p = project()
         .file(
             "Cargo.toml",
@@ -450,10 +457,26 @@ fn publish_with_crates_io_dep() {
 
     Package::new("bar", "0.0.1").publish();
 
-    // Login so that we have the token available
-    p.cargo("login --registry alternative TOKEN").run();
-
-    p.cargo("publish --registry alternative").run();
+    p.cargo("publish --registry alternative")
+        .with_stderr(
+            "\
+[UPDATING] `alternative` index
+[WARNING] [..]
+[..]
+[PACKAGING] foo v0.0.1 [..]
+[UPDATING] `dummy-registry` index
+[VERIFYING] foo v0.0.1 [..]
+[DOWNLOADING] [..]
+[DOWNLOADED] bar v0.0.1 (registry `dummy-registry`)
+[COMPILING] bar v0.0.1
+[COMPILING] foo v0.0.1 [..]
+[FINISHED] [..]
+[PACKAGED] [..]
+[UPLOADING] foo v0.0.1 [..]
+[UPDATING] `alternative` index
+",
+        )
+        .run();
 
     validate_alt_upload(
         r#"{