test(alt_registry): show current behavior allows \registry-index\ in user manifests

Author: moabo3li

tests/testsuite/alt_registry.rs

@@ -260,6 +260,61 @@ Caused by:
         .run();
 }
 
+#[cargo_test]
+fn registry_index_not_allowed_in_user_manifests() {
+    registry::alt_init();
+    Package::new("bar", "0.1.0").alternative(true).publish();
+
+    let p = project()
+        .file(
+            "Cargo.toml",
+            r#"
+                [package]
+                name = "foo"
+                version = "0.0.0"
+                edition = "2015"
+                authors = []
+
+                [dependencies]
+                bar = { version = "0.1.0", registry-index = "https://example.com/index" }
+            "#,
+        )
+        .file("src/lib.rs", "")
+        .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("check")
+        .with_status(101)
+        .with_stderr_data(str![[r#"
+[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 get `bar` as a dependency of package `foo v0.0.0 ([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();
+}
+
 #[cargo_test]
 fn cannot_publish_to_crates_io_with_registry_dependency() {
     let crates_io = registry::init();