rewrite libtest-padding to rmake

tests/run-make/libtest-padding/rmake.rs

@@ -0,0 +1,46 @@
+// Benchmarks, when ran as tests, would cause strange indentations
+// to appear in the output. This was because padding formatting was
+// applied before the conversion from bench to test, and not afterwards.
+// Now that this bug has been fixed in #118548, this test checks that it
+// does not make a resurgence by comparing the output of --bench with an
+// example stdout file.
+// See https://github.com/rust-lang/rust/issues/104092
+
+//@ ignore-cross-compile
+// Reason: the compiled code is ran
+//@ needs-unwind
+// Reason: #[bench] requires -Z panic-abort-tests
+
+use run_make_support::{diff, run_with_args, rustc};
+
+fn main() {
+    rustc().arg("--test").input("tests.rs").run();
+    let out = run_with_args("tests", &["--test-threads=1"]).stdout_utf8();
+    diff()
+        .expected_file("test.stdout")
+        .actual_text("actual-test-stdout", out)
+        .normalize(
+            // Replace all instances of (arbitrary numbers)
+            // [1.2345 ns/iter (+/- 0.1234)]
+            // with
+            // [?? ns/iter (+/- ??)]
+            r#"(\d+(?:[.,]\d+)*)\s*ns/iter\s*\(\+/-\s*(\d+(?:[.,]\d+)*)\)"#,
+            "?? ns/iter (+/- ??)",
+        )
+        // Replace all instances of (arbitrary numbers)
+        // finished in 8.0000 s
+        // with
+        // finished in ??
+        .normalize(r#"finished\s+in\s+(\d+(?:\.\d+)*)"#, "finished in ??")
+        .run();
+    let out = run_with_args("tests", &["--test-threads=1", "--bench"]).stdout_utf8();
+    diff()
+        .expected_file("bench.stdout")
+        .actual_text("actual-bench-stdout", out)
+        .normalize(
+            r#"(\d+(?:[.,]\d+)*)\s*ns/iter\s*\(\+/-\s*(\d+(?:[.,]\d+)*)\)"#,
+            "?? ns/iter (+/- ??)",
+        )
+        .normalize(r#"finished\s+in\s+(\d+(?:\.\d+)*)"#, "finished in ??")
+        .run();
+}