Ensure class merging needed for reproduction

Change-Id: I81e3310f4ea0b9dc74b793c0901181437848a81f
diff --git a/src/test/java/com/android/tools/r8/ir/optimize/inliner/Regress136250031.java b/src/test/java/com/android/tools/r8/ir/optimize/inliner/Regress136250031.java
index fbc405e..eb6d129 100644
--- a/src/test/java/com/android/tools/r8/ir/optimize/inliner/Regress136250031.java
+++ b/src/test/java/com/android/tools/r8/ir/optimize/inliner/Regress136250031.java
@@ -5,18 +5,36 @@
 package com.android.tools.r8.ir.optimize.inliner;
 
 import com.android.tools.r8.TestBase;
+import com.android.tools.r8.TestParameters;
+import com.android.tools.r8.TestParametersCollection;
 import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.Parameterized;
+import org.junit.runners.Parameterized.Parameter;
+import org.junit.runners.Parameterized.Parameters;
 
+@RunWith(Parameterized.class)
 public class Regress136250031 extends TestBase {
 
+  @Parameter(0)
+  public TestParameters parameters;
+
+  @Parameters(name = "{0}")
+  public static TestParametersCollection data() {
+    return getTestParameters().withAllRuntimesAndApiLevels().build();
+  }
+
   @Test
   public void test() throws Exception {
-        testForR8(Backend.CF)
-            .addInnerClasses(Regress136250031.class)
-            .addKeepMainRule(TestClass.class)
-            .addKeepClassAndMembersRules(B.class)
-            .run(TestClass.class)
-            .assertSuccess();
+    testForR8(parameters.getBackend())
+        .addInnerClasses(getClass())
+        .addKeepMainRule(TestClass.class)
+        .addKeepClassAndMembersRules(B.class)
+        .addVerticallyMergedClassesInspector(
+            inspector -> inspector.assertMergedIntoSubtype(A.class).assertNoOtherClassesMerged())
+        .setMinApi(parameters)
+        .run(parameters.getRuntime(), TestClass.class)
+        .assertSuccessWithOutputLines("42");
   }
 
   static class TestClass {
@@ -25,19 +43,19 @@
     }
   }
 
-  static class A {
+  public static class A {
     A(String s) {
       System.out.println(s);
     }
   }
 
-  static class B extends A {
+  public static class B extends A {
     B(C c) {
       super(c.instance.toString());
     }
   }
 
-  static class C {
+  public static class C {
     public C instance;
 
     C() {