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, 19 insertions, 0 deletions

diff --git a/tests/rustdoc/empty-impls.rs b/tests/rustdoc/empty-impls.rs
new file mode 100644
index 00000000000..83902d6f7ab
--- /dev/null
+++ b/tests/rustdoc/empty-impls.rs
@@ -0,0 +1,19 @@
+#![crate_name = "foo"]
+
+// @has foo/struct.Foo.html
+// @has - '//div[@id="synthetic-implementations-list"]/*[@id="impl-Send-for-Foo"]' 'impl Send for Foo'
+pub struct Foo;
+
+pub trait EmptyTrait {}
+
+// @has - '//div[@id="trait-implementations-list"]/*[@id="impl-EmptyTrait-for-Foo"]' 'impl EmptyTrait for Foo'
+impl EmptyTrait for Foo {}
+
+pub trait NotEmpty {
+    fn foo(&self);
+}
+
+// @has - '//div[@id="trait-implementations-list"]/details/summary/*[@id="impl-NotEmpty-for-Foo"]' 'impl NotEmpty for Foo'
+impl NotEmpty for Foo {
+    fn foo(&self) {}
+}