Auto merge of #106458 - albertlarsan68:move-tests, r=jyn514

Move src/test to the root

See MCP at rust-lang/compiler-team#573

There may be more changes needed.

The first commit is just the move of the files:
You can check that the first commit did not do anything else than renames by running
```
git diff --diff-filter=r -M100% <rust-lang remote>/master <first commit hash>
```
The output should be empty, because the filter excludes renames, and the match threshold for qualifying a rename is 100%.

The second one is mostly a "find and replace" of `src/test` to `tests` and whatever is needed to make CI pass.

What is left to do:
---

- [x] Move directory
- [ ] Change references to `src/test`
    - [x] Change references in-tree
    - [ ] Change references in submodules / out-of-tree docs
- [x] Make CI pass:
    - [x] Fix tidy
    - [x] Fix tests
    - [x] Bless tests if needed (shouldn't normally)
- [ ] Merge it !

1 files changed, 30 insertions, 0 deletions

diff --git a/tests/ui/command/command-argv0.rs b/tests/ui/command/command-argv0.rs
new file mode 100644
index 00000000000..b782a4fd3d1
--- /dev/null
+++ b/tests/ui/command/command-argv0.rs
@@ -0,0 +1,30 @@
+// run-pass
+
+// ignore-windows - this is a unix-specific test
+// ignore-emscripten no processes
+// ignore-sgx no processes
+use std::env;
+use std::os::unix::process::CommandExt;
+use std::process::Command;
+
+fn main() {
+    let args: Vec<_> = env::args().collect();
+
+    if args.len() > 1 {
+        assert_eq!(args[1], "doing-test");
+        assert_eq!(args[0], "i have a silly name");
+
+        println!("passed");
+        return;
+    }
+
+    let output =
+        Command::new(&args[0]).arg("doing-test").arg0("i have a silly name").output().unwrap();
+    assert!(
+        output.stderr.is_empty(),
+        "Non-empty stderr: {}",
+        String::from_utf8_lossy(&output.stderr)
+    );
+    assert!(output.status.success());
+    assert_eq!(output.stdout, b"passed\n");
+}