diff --git a/test/compress/evaluate.js b/test/compress/evaluate.js
index b50d7200..611acf0d 100644
--- a/test/compress/evaluate.js
+++ b/test/compress/evaluate.js
@@ -959,27 +959,33 @@ delete_binary_2: {
 }
 
 Infinity_NaN_undefined_LHS: {
-    options = {}
+    beautify = {
+        beautify: true,
+    }
     input: {
-        Infinity = Infinity;
-        ++Infinity;
-        Infinity--;
-        NaN *= NaN;
-        ++NaN;
-        NaN--;
-        undefined |= undefined;
-        ++undefined;
-        undefined--;
-    }
-    expect: {
-        Infinity = 1 / 0;
-        ++Infinity;
-        Infinity--;
-        NaN *= NaN;
-        ++NaN;
-        NaN--;
-        undefined |= void 0;
-        ++undefined;
-        undefined--;
+        function f() {
+            Infinity = Infinity;
+            ++Infinity;
+            Infinity--;
+            NaN *= NaN;
+            ++NaN;
+            NaN--;
+            undefined |= undefined;
+            ++undefined;
+            undefined--;
+        }
     }
+    expect_exact: [
+        "function f() {",
+        "    Infinity = 1 / 0;",
+        "    ++Infinity;",
+        "    Infinity--;",
+        "    NaN *= NaN;",
+        "    ++NaN;",
+        "    NaN--;",
+        "    undefined |= void 0;",
+        "    ++undefined;",
+        "    undefined--;",
+        "}",
+    ]
 }