test(publish): show current behavior allows \registry-index\ during publish

Author: moabo3li

tests/testsuite/publish.rs

@@ -4595,3 +4595,68 @@ Caused by:
 "#]])
         .run();
 }
+
+#[cargo_test]
+fn registry_index_not_allowed_in_publish() {
+    let _registry = RegistryBuilder::new()
+        .http_api()
+        .http_index()
+        .alternative()
+        .build();
+
+    let p = project()
+        .file(
+            "Cargo.toml",
+            r#"
+                [package]
+                name = "foo"
+                version = "0.0.1"
+                edition = "2015"
+                authors = []
+                license = "MIT"
+                description = "foo"
+
+                [dependencies]
+                bar = { version = "0.1.0", registry-index = "https://example.com/index" }
+            "#,
+        )
+        .file("src/main.rs", "fn main() {}")
+        .build();
+
+    // FIXME: This currently allows `registry-index` which is a bug.
+    // It should error during manifest parsing because `registry-index` is for internal use only.
+    // Instead, it tries to fetch from the URL and fails with a network error.
+    p.cargo("publish --registry alternative")
+        .with_status(101)
+        .with_stderr_data(str![[r#"
+[UPDATING] `alternative` index
+[PACKAGING] foo v0.0.1 ([ROOT]/foo)
+[UPDATING] `https://example.com/index` index
+[WARNING] spurious network error (3 tries remaining): unexpected http status code: 404; class=Http (34)
+[WARNING] spurious network error (2 tries remaining): unexpected http status code: 404; class=Http (34)
+[WARNING] spurious network error (1 try remaining): unexpected http status code: 404; class=Http (34)
+[ERROR] failed to prepare local package for uploading
+
+Caused by:
+  failed to get `bar` as a dependency of package `foo v0.0.1 ([ROOT]/foo)`
+
+Caused by:
+  failed to load source for dependency `bar`
+
+Caused by:
+  Unable to update registry `https://example.com/index`
+
+Caused by:
+  failed to fetch `https://example.com/index`
+
+Caused by:
+  network failure seems to have happened
+  if a proxy or similar is necessary `net.git-fetch-with-cli` may help here
+  https://doc.rust-lang.org/cargo/reference/config.html#netgit-fetch-with-cli
+
+Caused by:
+  unexpected http status code: 404; class=Http (34)
+
+"#]])
+        .run();
+}