Add snapshot test for x clippy std

Author: Kobzol

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

@@ -1894,6 +1894,23 @@ mod snapshot {
         [clippy] rustc 0 <host> -> rustc 1 <host>
         ");
     }
+
+    #[test]
+    fn clippy_std() {
+        let ctx = TestCtx::new();
+        insta::assert_snapshot!(
+            ctx.config("clippy")
+                .path("std")
+                .render_steps(), @r"
+        [build] llvm <host>
+        [build] rustc 0 <host> -> rustc 1 <host>
+        [build] rustc 1 <host> -> std 1 <host>
+        [build] rustc 1 <host> -> rustc 2 <host>
+        [build] rustc 1 <host> -> clippy-driver 2 <host>
+        [build] rustc 1 <host> -> cargo-clippy 2 <host>
+        [clippy] std <host>
+        ");
+    }
 }
 
 struct ExecutedSteps {