Add a test for not keeping all of kotlin.Metadata

Bug: 156447059
Change-Id: I4bbaad476051f6d33764039c81d332b65f88d05a

src/test/java/com/android/tools/r8/kotlin/metadata/MetadataRewriteKeepTest.java

diff --git a/src/test/java/com/android/tools/r8/kotlin/metadata/MetadataRewriteKeepTest.java b/src/test/java/com/android/tools/r8/kotlin/metadata/MetadataRewriteKeepTest.java
index 608f914..e6f238d 100644
--- a/src/test/java/com/android/tools/r8/kotlin/metadata/MetadataRewriteKeepTest.java
+++ b/src/test/java/com/android/tools/r8/kotlin/metadata/MetadataRewriteKeepTest.java
@@ -4,19 +4,20 @@
 
 package com.android.tools.r8.kotlin.metadata;
 
+import static com.android.tools.r8.utils.codeinspector.Matchers.isPresent;
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertNotNull;
 import static org.junit.Assert.assertNull;
 
-import com.android.tools.r8.CompilationFailedException;
 import com.android.tools.r8.TestParameters;
 import com.android.tools.r8.ToolHelper;
 import com.android.tools.r8.ToolHelper.KotlinTargetVersion;
 import com.android.tools.r8.shaking.ProguardKeepAttributes;
+import com.android.tools.r8.utils.codeinspector.ClassSubject;
 import com.android.tools.r8.utils.codeinspector.CodeInspector;
 import com.android.tools.r8.utils.codeinspector.FoundClassSubject;
-import java.io.IOException;
 import java.util.Collection;
-import java.util.concurrent.ExecutionException;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.junit.runners.Parameterized;
@@ -38,7 +39,7 @@
   }
 
   @Test
-  public void testR8() throws CompilationFailedException, IOException, ExecutionException {
+  public void testR8() throws Exception {
     testForR8(parameters.getBackend())
         .addProgramFiles(ToolHelper.getKotlinStdlibJar())
         .setMinApi(parameters.getApiLevel())
@@ -49,12 +50,53 @@
         .inspect(this::inspect);
   }
 
+  @Test
+  public void testR8KeepPartial() throws Exception {
+    // This test is a bit weird, since it shows that we can remove params from the kotlin.Metadata
+    // class, but still be able to fully read the kotlin.Metadata.
+    testForR8(parameters.getBackend())
+        .addProgramFiles(ToolHelper.getKotlinStdlibJar())
+        .setMinApi(parameters.getApiLevel())
+        .addKeepRules("-keep class kotlin.Metadata { *** d1(); }")
+        .addKeepAttributes(ProguardKeepAttributes.RUNTIME_VISIBLE_ANNOTATIONS)
+        .compile()
+        .inspect(
+            inspector -> {
+              inspect(inspector);
+              ClassSubject kotlinMetadataClass = inspector.clazz("kotlin.Metadata");
+              assertThat(kotlinMetadataClass, isPresent());
+              assertEquals(1, kotlinMetadataClass.allMethods().size());
+              assertNotNull(kotlinMetadataClass.getKmClass().getName());
+            });
+  }
+
+  @Test
+  public void testR8KeepPartialCooking() throws Exception {
+    // This test is a bit weird, since it shows that we can remove params from the kotlin.Metadata
+    // class, but still be able to fully read the kotlin.Metadata externally.
+    testForR8(parameters.getBackend())
+        .addProgramFiles(ToolHelper.getKotlinStdlibJar())
+        .setMinApi(parameters.getApiLevel())
+        .addKeepRules("-keep class kotlin.Metadata { *** d1(); }")
+        .addKeepAttributes(ProguardKeepAttributes.RUNTIME_VISIBLE_ANNOTATIONS)
+        .compile()
+        .inspect(
+            inspector -> {
+              inspect(inspector);
+              ClassSubject kotlinMetadataClass = inspector.clazz("kotlin.Metadata");
+              assertThat(kotlinMetadataClass, isPresent());
+              assertEquals(1, kotlinMetadataClass.allMethods().size());
+              assertNotNull(kotlinMetadataClass.getKmClass().getName());
+            });
+  }
+
   private void inspect(CodeInspector inspector) {
     // All kept classes should have their kotlin metadata.
     for (FoundClassSubject clazz : inspector.allClasses()) {
       if (clazz.getFinalName().startsWith("kotlin.io")
           || clazz.getFinalName().equals("kotlin.Metadata")) {
         assertNotNull(clazz.getKotlinClassMetadata());
+        assertNotNull(clazz.getKotlinClassMetadata().getHeader().getData2());
       } else {
         assertNull(clazz.getKotlinClassMetadata());
       }