Rollup merge of #124698 - JoverZhang:test-rustdoc-determinism, r=jieyouxu

Rewrite `rustdoc-determinism` test in Rust

Rewrite the `rustdoc-determinism` test from #121876.

r? `@jieyouxu`

src/tools/tidy/src/allowed_run_make_makefiles.txt

@@ -245,7 +245,6 @@ run-make/rlib-format-packed-bundled-libs-3/Makefile
 run-make/rlib-format-packed-bundled-libs/Makefile
 run-make/rmeta-preferred/Makefile
 run-make/rustc-macro-dep-files/Makefile
-run-make/rustdoc-determinism/Makefile
 run-make/rustdoc-error-lines/Makefile
 run-make/rustdoc-io-error/Makefile
 run-make/rustdoc-map-file/Makefile

tests/run-make/rustdoc-determinism/Makefile

@@ -1,16 +0,0 @@
-include ../tools.mk
-
-# Assert that the search index is generated deterministically, regardless of the
-# order that crates are documented in.
-
-# ignore-windows
-# Uses `diff`.
-
-all:
-	$(RUSTDOC) foo.rs -o $(TMPDIR)/foo_first
-	$(RUSTDOC) bar.rs -o $(TMPDIR)/foo_first
-
-	$(RUSTDOC) bar.rs -o $(TMPDIR)/bar_first
-	$(RUSTDOC) foo.rs -o $(TMPDIR)/bar_first
-
-	diff $(TMPDIR)/foo_first/search-index.js $(TMPDIR)/bar_first/search-index.js

tests/run-make/rustdoc-determinism/rmake.rs

@@ -0,0 +1,18 @@
+use run_make_support::{diff, rustc, rustdoc, tmp_dir};
+
+/// Assert that the search index is generated deterministically, regardless of the
+/// order that crates are documented in.
+fn main() {
+    let dir_first = tmp_dir().join("first");
+    rustdoc().out_dir(&dir_first).input("foo.rs").run();
+    rustdoc().out_dir(&dir_first).input("bar.rs").run();
+
+    let dir_second = tmp_dir().join("second");
+    rustdoc().out_dir(&dir_second).input("bar.rs").run();
+    rustdoc().out_dir(&dir_second).input("foo.rs").run();
+
+    diff()
+        .expected_file(dir_first.join("search-index.js"))
+        .actual_file(dir_second.join("search-index.js"))
+        .run();
+}