Add a test for class staticizer limitation

Change-Id: Ie2261073fb21c7aed40df79f7acbc5f1b05eacbc
diff --git a/src/test/java/com/android/tools/r8/ir/optimize/staticizer/CompanionClassWithNewInstanceUserTest.java b/src/test/java/com/android/tools/r8/ir/optimize/staticizer/CompanionClassWithNewInstanceUserTest.java
new file mode 100644
index 0000000..5aeb159
--- /dev/null
+++ b/src/test/java/com/android/tools/r8/ir/optimize/staticizer/CompanionClassWithNewInstanceUserTest.java
@@ -0,0 +1,73 @@
+package com.android.tools.r8.ir.optimize.staticizer;
+
+import static com.android.tools.r8.utils.codeinspector.Matchers.isPresent;
+import static org.hamcrest.MatcherAssert.assertThat;
+
+import com.android.tools.r8.NeverInline;
+import com.android.tools.r8.TestBase;
+import com.android.tools.r8.TestParameters;
+import com.android.tools.r8.TestParametersCollection;
+import com.android.tools.r8.utils.codeinspector.CodeInspector;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.Parameterized;
+import org.junit.runners.Parameterized.Parameters;
+
+@RunWith(Parameterized.class)
+public class CompanionClassWithNewInstanceUserTest extends TestBase {
+
+  private final TestParameters parameters;
+
+  @Parameters(name = "{0}")
+  public static TestParametersCollection data() {
+    return getTestParameters().withAllRuntimesAndApiLevels().build();
+  }
+
+  public CompanionClassWithNewInstanceUserTest(TestParameters parameters) {
+    this.parameters = parameters;
+  }
+
+  @Test
+  public void test() throws Exception {
+    testForR8(parameters.getBackend())
+        .addInnerClasses(CompanionClassWithNewInstanceUserTest.class)
+        .addKeepMainRule(TestClass.class)
+        .enableInliningAnnotations()
+        .setMinApi(parameters.getApiLevel())
+        .compile()
+        .inspect(this::inspect)
+        .run(parameters.getRuntime(), TestClass.class)
+        .assertSuccessWithOutputLines("Hello world!");
+  }
+
+  private void inspect(CodeInspector inspector) {
+    // The companion class has not been removed.
+    assertThat(inspector.clazz(Companion.class), isPresent());
+  }
+
+  static class TestClass {
+
+    public static void main(String[] args) {
+      Companion companion = CompanionHost.COMPANION;
+    }
+  }
+
+  static class CompanionHost {
+
+    static final Companion COMPANION;
+
+    static {
+      Companion companion = new Companion();
+      COMPANION = companion;
+      companion.method();
+    }
+  }
+
+  static class Companion {
+
+    @NeverInline
+    public void method() {
+      System.out.println("Hello world!");
+    }
+  }
+}