diff --git a/tests/mir-opt/instsimplify_duplicate_switch_targets.assert_zero.InstSimplify.diff b/tests/mir-opt/instsimplify/duplicate_switch_targets.assert_zero.InstSimplify.diff
similarity index 100%
rename from tests/mir-opt/instsimplify_duplicate_switch_targets.assert_zero.InstSimplify.diff
rename to tests/mir-opt/instsimplify/duplicate_switch_targets.assert_zero.InstSimplify.diff
diff --git a/tests/mir-opt/instsimplify_duplicate_switch_targets.rs b/tests/mir-opt/instsimplify/duplicate_switch_targets.rs
similarity index 75%
rename from tests/mir-opt/instsimplify_duplicate_switch_targets.rs
rename to tests/mir-opt/instsimplify/duplicate_switch_targets.rs
index db98bb400b9..e40bc7edaac 100644
--- a/tests/mir-opt/instsimplify_duplicate_switch_targets.rs
+++ b/tests/mir-opt/instsimplify/duplicate_switch_targets.rs
@@ -1,14 +1,15 @@
-// skip-filecheck
+// unit-test: InstSimplify
+
 #![feature(custom_mir, core_intrinsics)]
 #![crate_type = "lib"]
 
 use std::intrinsics::mir::*;
 
-// unit-test: InstSimplify
-
-// EMIT_MIR instsimplify_duplicate_switch_targets.assert_zero.InstSimplify.diff
+// EMIT_MIR duplicate_switch_targets.assert_zero.InstSimplify.diff
 #[custom_mir(dialect = "runtime", phase = "post-cleanup")]
 pub unsafe fn assert_zero(x: u8) -> u8 {
+    // CHECK-LABEL: fn assert_zero(
+    // CHECK: switchInt({{.*}}) -> [0: {{bb.*}}, otherwise: {{bb.*}}]
     mir!(
         {
             match x {