Auto merge of rust-lang#13789 - cuviper:test-offline, r=weihanglo

Fix 2 tests for offline execution

In `alt_registry::warn_for_unused_fields`, the second part of the test
runs on `--registry crates-io`, so it needs a local replacement url.

In `install::install_global_cargo_config`, it was adding to the "config"
file, but the `pkg` before it configured the dummy registry replacement
in "config.toml". So that replacement wasn't actually used, and if you
ran tests online it was trying to install `bar v0.1.1` from the real
registry! The filename is now fixed, and the test double-checks that
we're only trying to install the local `bar v0.0.1`.

tests/testsuite/alt_registry.rs

@@ -1572,7 +1572,11 @@ or use environment variable CARGO_REGISTRIES_ALTERNATIVE_TOKEN",
         )
         .run();
 
+    let crates_io = registry::RegistryBuilder::new()
+        .no_configure_token()
+        .build();
     p.cargo("publish --registry crates-io")
+        .replace_crates_io(crates_io.index_url())
         .with_status(101)
         .with_stderr(
             "\

tests/testsuite/install.rs

@@ -1981,7 +1981,7 @@ fn install_ignores_unstable_table_in_local_cargo_config() {
 fn install_global_cargo_config() {
     pkg("bar", "0.0.1");
 
-    let config = cargo_home().join("config");
+    let config = cargo_home().join("config.toml");
     let mut toml = fs::read_to_string(&config).unwrap_or_default();
 
     toml.push_str(
@@ -1994,6 +1994,7 @@ fn install_global_cargo_config() {
 
     cargo_process("install bar")
         .with_status(101)
+        .with_stderr_contains("[INSTALLING] bar v0.0.1")
         .with_stderr_contains("[..]--target nonexistent[..]")
         .run();
 }