Test startup layout without startup class rules

Bug: b/274591979
Change-Id: I45ca376cc72d8c2f363dcfec1119032e39efe1fd

src/test/java/com/android/tools/r8/startup/MinimalStartupDexFromStartupMethodRuleTest.java

diff --git a/src/test/java/com/android/tools/r8/startup/MinimalStartupDexFromStartupMethodRuleTest.java b/src/test/java/com/android/tools/r8/startup/MinimalStartupDexFromStartupMethodRuleTest.java
new file mode 100644
index 0000000..dcd0191
--- /dev/null
+++ b/src/test/java/com/android/tools/r8/startup/MinimalStartupDexFromStartupMethodRuleTest.java
@@ -0,0 +1,94 @@
+// Copyright (c) 2023, 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.startup;
+
+import static com.android.tools.r8.utils.codeinspector.Matchers.isAbsent;
+import static com.android.tools.r8.utils.codeinspector.Matchers.isPresent;
+import static org.hamcrest.MatcherAssert.assertThat;
+
+import com.android.tools.r8.TestBase;
+import com.android.tools.r8.TestCompilerBuilder;
+import com.android.tools.r8.TestParameters;
+import com.android.tools.r8.TestParametersCollection;
+import com.android.tools.r8.startup.profile.ExternalStartupMethod;
+import com.android.tools.r8.startup.utils.StartupTestingUtils;
+import com.android.tools.r8.utils.AndroidApiLevel;
+import com.android.tools.r8.utils.MethodReferenceUtils;
+import com.android.tools.r8.utils.codeinspector.ClassSubject;
+import com.google.common.collect.ImmutableList;
+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 MinimalStartupDexFromStartupMethodRuleTest extends TestBase {
+
+  @Parameter(0)
+  public TestParameters parameters;
+
+  @Parameters(name = "{0}")
+  public static TestParametersCollection data() {
+    return getTestParameters()
+        .withDexRuntimes()
+        .withApiLevelsStartingAtIncluding(AndroidApiLevel.L)
+        .build();
+  }
+
+  @Test
+  public void testD8() throws Exception {
+    runTest(testForD8(parameters.getBackend()));
+  }
+
+  @Test
+  public void testR8() throws Exception {
+    runTest(testForR8(parameters.getBackend()).addKeepAllClassesRule());
+  }
+
+  private void runTest(TestCompilerBuilder<?, ?, ?, ?, ?> testCompilerBuilder) throws Exception {
+    testCompilerBuilder
+        .addInnerClasses(getClass())
+        .apply(this::configureStartupConfiguration)
+        .setMinApi(parameters)
+        .compile()
+        .inspectMultiDex(
+            primaryDexInspector -> {
+              ClassSubject mainClassSubject = primaryDexInspector.clazz(Main.class);
+              assertThat(mainClassSubject, isPresent());
+
+              // TODO(b/274591979): Should be in classes2.dex.
+              ClassSubject postStartupClassSubject =
+                  primaryDexInspector.clazz(PostStartupClass.class);
+              assertThat(postStartupClassSubject, isPresent());
+            },
+            secondaryDexInspector -> {
+              // TODO(b/274591979): Should be present.
+              ClassSubject postStartupClassSubject =
+                  secondaryDexInspector.clazz(PostStartupClass.class);
+              assertThat(postStartupClassSubject, isAbsent());
+            })
+        .run(parameters.getRuntime(), Main.class)
+        .assertSuccessWithOutputLines("Hello, world!");
+  }
+
+  private void configureStartupConfiguration(TestCompilerBuilder<?, ?, ?, ?, ?> testBuilder) {
+    StartupTestingUtils.setStartupConfiguration(
+        testBuilder,
+        ImmutableList.of(
+            ExternalStartupMethod.builder()
+                .setMethodReference(MethodReferenceUtils.mainMethod(Main.class))
+                .build()));
+  }
+
+  static class Main {
+
+    public static void main(String[] args) {
+      System.out.println("Hello, world!");
+    }
+  }
+
+  static class PostStartupClass {}
+}