Add ResourceIdentifierTest

Change-Id: I9b820dd45d7af0e09b88a821d63db6d81497e8c8

src/test/java/com/android/tools/r8/androidresources/ResourceIdentifierTest.java

diff --git a/src/test/java/com/android/tools/r8/androidresources/ResourceIdentifierTest.java b/src/test/java/com/android/tools/r8/androidresources/ResourceIdentifierTest.java
new file mode 100644
index 0000000..be3093b
--- /dev/null
+++ b/src/test/java/com/android/tools/r8/androidresources/ResourceIdentifierTest.java
@@ -0,0 +1,105 @@
+// Copyright (c) 2026, the R8 project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+package com.android.tools.r8.androidresources;
+
+import com.android.tools.r8.R8TestBuilder;
+import com.android.tools.r8.TestBase;
+import com.android.tools.r8.TestParameters;
+import com.android.tools.r8.androidresources.AndroidResourceTestingUtils.AndroidTestResource;
+import com.android.tools.r8.androidresources.AndroidResourceTestingUtils.AndroidTestResourceBuilder;
+import com.android.tools.r8.utils.internal.BooleanUtils;
+import java.nio.file.Path;
+import java.util.List;
+import org.junit.Test;
+import org.junit.rules.TemporaryFolder;
+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 ResourceIdentifierTest extends TestBase {
+
+  @Parameter(0)
+  public TestParameters parameters;
+
+  @Parameter(1)
+  public boolean optimized;
+
+  @Parameters(name = "{0}, optimized: {1}")
+  public static List<Object[]> data() {
+    return buildParameters(
+        getTestParameters().withDefaultDexRuntime().withAllApiLevels().build(),
+        BooleanUtils.values());
+  }
+
+  public static AndroidTestResource getTestResources(TemporaryFolder temp) throws Exception {
+    return new AndroidTestResourceBuilder()
+        .withSimpleManifestAndAppNameString()
+        .addStringValue("foobar", "the foobar string")
+        .addXmlWithStringReference("xmlfile.xml", "foobar")
+        .addRClassInitializeWithDefaultValues(R.id.class, R.xml.class)
+        .build(temp);
+  }
+
+  @Test
+  public void testR8() throws Exception {
+    AndroidTestResource testResources = getTestResources(temp);
+    Path resourcesClass = AndroidResourceTestingUtils.resourcesClassAsDex(temp);
+    byte[] withAndroidResourcesReference =
+        AndroidResourceTestingUtils.transformResourcesReferences(FooBar.class);
+
+    testForR8(parameters.getBackend())
+        .setMinApi(parameters)
+        .addProgramClassFileData(withAndroidResourcesReference)
+        .addRunClasspathFiles(resourcesClass)
+        .addAndroidResources(testResources)
+        .addKeepMainRule(FooBar.class)
+        .applyIf(optimized, R8TestBuilder::enableOptimizedShrinking)
+        .compile()
+        .inspectShrunkenResources(
+            resourceTableInspector -> {
+              resourceTableInspector.assertContainsResourceWithName("id", "id_in_live_xml");
+              // We should probably remove this id in optimized:
+              resourceTableInspector.assertContainsResourceWithName("id", "id_in_dead_xml");
+              // We should remove this id in optimized
+              resourceTableInspector.assertContainsResourceWithName("id", "reflectively_used_id");
+              if (optimized) {
+                resourceTableInspector.assertDoesNotContainResourceWithName("string", "foobar");
+              } else {
+                resourceTableInspector.assertContainsResourceWithName("string", "foobar");
+              }
+            })
+        .run(parameters.getRuntime(), FooBar.class)
+        .assertSuccess();
+  }
+
+  public static class FooBar {
+
+    public static void main(String[] args) {
+      Resources resources = new Resources();
+      System.out.println(resources.getIdentifier("foobar", "string", "com.android.tools.r8"));
+      System.out.println(
+          resources.getIdentifier("reflectively_used_id", "id", "com.android.tools.r8"));
+
+      System.out.println(R.id.id_in_live_xml);
+      System.out.println(R.xml.file_id_in_live_xml);
+      System.out.println(R.id.id_in_dead_xml);
+    }
+  }
+
+  public static class R {
+
+    public static class xml {
+      public static int file_id_in_live_xml;
+      public static int file_id_in_dead_xml;
+    }
+
+    public static class id {
+      public static int reflectively_used_id;
+      public static int id_in_live_xml;
+      public static int id_in_dead_xml;
+    }
+  }
+}

src/test/testbase/java/com/android/tools/r8/androidresources/AndroidResourceTestingUtils.java

diff --git a/src/test/testbase/java/com/android/tools/r8/androidresources/AndroidResourceTestingUtils.java b/src/test/testbase/java/com/android/tools/r8/androidresources/AndroidResourceTestingUtils.java
index 4541cf1..d6d5aff 100644
--- a/src/test/testbase/java/com/android/tools/r8/androidresources/AndroidResourceTestingUtils.java
+++ b/src/test/testbase/java/com/android/tools/r8/androidresources/AndroidResourceTestingUtils.java
@@ -501,7 +501,7 @@
     }
 
     AndroidTestResourceBuilder addIdValue(String name) {
-      xmlFiles.put(name + ".xml", String.format(XML_FILE_WITH_ID, name));
+      xmlFiles.put("file_" + name + ".xml", String.format(XML_FILE_WITH_ID, name));
       return this;
     }