Add bootstrap tool check test

src/bootstrap/src/core/builder/tests.rs

@@ -1455,6 +1455,20 @@ mod snapshot {
         ");
     }
 
+    #[test]
+    fn check_bootstrap_tool() {
+        let ctx = TestCtx::new();
+        insta::assert_snapshot!(
+            ctx.config("check")
+                .path("run-make-support")
+                .render_steps(), @r"
+        [check] std <host>
+        [build] llvm <host>
+        [check] rustc <host>
+        [check] RunMakeSupport <host>
+        ");
+    }
+
     #[test]
     fn test_exclude() {
         let ctx = TestCtx::new();