Add test that captures current behavior for shaking annotations

Bug: 142780704
Change-Id: I51d72eb7adf687ed99b6ce57007d7fc3c9ae2e0a

src/test/java/com/android/tools/r8/shaking/annotations/AnnotationShakingBehaviorTest.java

diff --git a/src/test/java/com/android/tools/r8/shaking/annotations/AnnotationShakingBehaviorTest.java b/src/test/java/com/android/tools/r8/shaking/annotations/AnnotationShakingBehaviorTest.java
new file mode 100644
index 0000000..484fb10
--- /dev/null
+++ b/src/test/java/com/android/tools/r8/shaking/annotations/AnnotationShakingBehaviorTest.java
@@ -0,0 +1,159 @@
+// Copyright (c) 2018, 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.shaking.annotations;
+
+import static com.android.tools.r8.utils.codeinspector.Matchers.isPresent;
+import static org.hamcrest.CoreMatchers.not;
+import static org.hamcrest.MatcherAssert.assertThat;
+
+import com.android.tools.r8.CompilationFailedException;
+import com.android.tools.r8.NeverClassInline;
+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 java.io.IOException;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.concurrent.ExecutionException;
+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 AnnotationShakingBehaviorTest extends TestBase {
+
+  private final TestParameters parameters;
+
+  @Parameters(name = "{0}")
+  public static TestParametersCollection data() {
+    return getTestParameters().withAllRuntimesAndApiLevels().build();
+  }
+
+  public AnnotationShakingBehaviorTest(TestParameters parameters) {
+    this.parameters = parameters;
+  }
+
+  @Test
+  public void testKeepUnusedTypeInAnnotation()
+      throws IOException, CompilationFailedException, ExecutionException {
+    testForR8(parameters.getBackend())
+        .addProgramClasses(Factory.class, Main.class, C.class)
+        .addKeepMainRule(Main.class)
+        .addKeepClassAndMembersRules(Factory.class)
+        .addKeepAttributes("*Annotation*")
+        .setMinApi(parameters.getApiLevel())
+        .run(parameters.getRuntime(), Main.class)
+        .assertSuccessWithOutputLines("Hello World!")
+        .inspect(inspector -> assertThat(inspector.clazz(C.class), isPresent()));
+  }
+
+  @Test
+  public void testWillKeepAnnotatedProgramClass()
+      throws IOException, CompilationFailedException, ExecutionException {
+    testForR8(parameters.getBackend())
+        .addProgramClasses(Factory.class, MainWithMethodAnnotation.class, C.class)
+        .addKeepMainRule(MainWithMethodAnnotation.class)
+        .addKeepClassAndMembersRules(Factory.class)
+        .addKeepAttributes("*Annotation*")
+        .enableInliningAnnotations()
+        .setMinApi(parameters.getApiLevel())
+        .run(parameters.getRuntime(), MainWithMethodAnnotation.class)
+        .assertSuccessWithOutputLines("Hello World!")
+        .inspect(inspector -> assertThat(inspector.clazz(C.class), isPresent()));
+  }
+
+  @Test
+  public void testGenericSignatureDoNotKeepType()
+      throws IOException, CompilationFailedException, ExecutionException {
+    testForR8(parameters.getBackend())
+        .addProgramClasses(MainWithGenericC.class, C.class)
+        .addKeepMainRule(MainWithGenericC.class)
+        .addKeepAttributes("Signature", "InnerClasses", "EnclosingMethod")
+        .setMinApi(parameters.getApiLevel())
+        .run(parameters.getRuntime(), MainWithGenericC.class)
+        .assertSuccessWithOutputLines("Hello World!")
+        .inspect(
+            inspector -> {
+              assertThat(inspector.clazz(C.class), not(isPresent()));
+            });
+  }
+
+  @Test
+  public void testDisappearsWhenMerging()
+      throws IOException, CompilationFailedException, ExecutionException {
+    testForR8(parameters.getBackend())
+        .addProgramClasses(Factory.class, MainWithNewB.class, A.class, B.class, C.class)
+        .addKeepMainRule(MainWithNewB.class)
+        .addKeepClassAndMembersRules(Factory.class)
+        .addKeepAttributes("*Annotation*")
+        .setMinApi(parameters.getApiLevel())
+        .run(parameters.getRuntime(), MainWithNewB.class)
+        .assertSuccessWithOutputLines("Hello World!")
+        .inspect(
+            inspector -> {
+              assertThat(inspector.clazz(C.class), not(isPresent()));
+            });
+  }
+
+  @Retention(value = RetentionPolicy.RUNTIME)
+  public @interface Factory {
+    Class<?> ref() default Object.class;
+  }
+
+  public static class C {}
+
+  @Factory(ref = C.class) // <-- we are explicitly keeping Main.
+  public static class Main {
+
+    public static void main(String[] args) {
+      System.out.println("Hello World!");
+    }
+  }
+
+  public static class MainWithMethodAnnotation {
+
+    public static void main(String[] args) {
+      test();
+    }
+
+    @Factory(ref = C.class) // <-- We are not explicitly saying that test() should be kept.
+    @NeverInline
+    public static void test() {
+      System.out.println("Hello World!");
+    }
+  }
+
+  public static class MainWithGenericC {
+
+    static List<C> cs = new ArrayList<>();
+
+    public static void main(String[] args) {
+      if (cs.size() == args.length) {
+        System.out.println("Hello World!");
+      }
+    }
+  }
+
+  @Factory(ref = C.class)
+  public static class A {}
+
+  @NeverClassInline
+  public static class B extends A {
+    @NeverInline
+    public void world() {
+      System.out.println("Hello World!");
+    }
+  }
+
+  public static class MainWithNewB {
+
+    public static void main(String[] args) {
+      new B().world();
+    }
+  }
+}