diff --git a/src/test/java/com/android/tools/r8/partial/PartialCompilationWithDefaultInterfaceMethodTest.java b/src/test/java/com/android/tools/r8/partial/PartialCompilationWithDefaultInterfaceMethodTest.java
new file mode 100644
index 0000000..ee97ab3
--- /dev/null
+++ b/src/test/java/com/android/tools/r8/partial/PartialCompilationWithDefaultInterfaceMethodTest.java
@@ -0,0 +1,68 @@
+// Copyright (c) 2025, 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.partial;
+
+import static org.junit.Assume.assumeTrue;
+
+import com.android.tools.r8.TestBase;
+import com.android.tools.r8.TestParameters;
+import com.android.tools.r8.TestParametersCollection;
+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 PartialCompilationWithDefaultInterfaceMethodTest extends TestBase {
+
+  @Parameter(0)
+  public TestParameters parameters;
+
+  @Parameters(name = "{0}")
+  public static TestParametersCollection data() {
+    return getTestParameters().withDexRuntimesAndAllApiLevels().build();
+  }
+
+  @Test
+  public void test() throws Exception {
+    // TODO(b/388763735): Enable for all API levels.
+    assumeTrue(parameters.canUseDefaultAndStaticInterfaceMethods());
+    testForR8Partial(parameters.getBackend())
+        .addInnerClasses(getClass())
+        .addR8IncludedClasses(I.class, J.class)
+        .addR8ExcludedClasses(Main.class, A.class)
+        .setMinApi(parameters)
+        .compile()
+        .run(parameters.getRuntime(), Main.class)
+        .assertSuccessWithOutputLines("Hello, world!");
+  }
+
+  // D8
+
+  static class Main {
+
+    public static void main(String[] args) {
+      I i = new A();
+      i.m();
+    }
+  }
+
+  static class A implements J {}
+
+  // R8
+
+  interface I {
+
+    void m();
+  }
+
+  interface J extends I {
+
+    @Override
+    default void m() {
+      System.out.println("Hello, world!");
+    }
+  }
+}
diff --git a/src/test/java/com/android/tools/r8/partial/PartialCompilationWithNonAbstractMethodOnAbstractClassTest.java b/src/test/java/com/android/tools/r8/partial/PartialCompilationWithNonAbstractMethodOnAbstractClassTest.java
new file mode 100644
index 0000000..a1b0a57
--- /dev/null
+++ b/src/test/java/com/android/tools/r8/partial/PartialCompilationWithNonAbstractMethodOnAbstractClassTest.java
@@ -0,0 +1,68 @@
+// Copyright (c) 2025, 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.partial;
+
+import static org.junit.Assume.assumeTrue;
+
+import com.android.tools.r8.TestBase;
+import com.android.tools.r8.TestParameters;
+import com.android.tools.r8.TestParametersCollection;
+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 PartialCompilationWithNonAbstractMethodOnAbstractClassTest extends TestBase {
+
+  @Parameter(0)
+  public TestParameters parameters;
+
+  @Parameters(name = "{0}")
+  public static TestParametersCollection data() {
+    return getTestParameters().withDexRuntimesAndAllApiLevels().build();
+  }
+
+  @Test
+  public void test() throws Exception {
+    // TODO(b/388763735): Enable for all API levels.
+    assumeTrue(parameters.canUseDefaultAndStaticInterfaceMethods());
+    testForR8Partial(parameters.getBackend())
+        .addInnerClasses(getClass())
+        .addR8IncludedClasses(A.class, B.class)
+        .addR8ExcludedClasses(Main.class, C.class)
+        .setMinApi(parameters)
+        .compile()
+        .run(parameters.getRuntime(), Main.class)
+        .assertSuccessWithOutputLines("Hello, world!");
+  }
+
+  // D8
+
+  static class Main {
+
+    public static void main(String[] args) {
+      A a = new C();
+      a.m();
+    }
+  }
+
+  static class C extends B {}
+
+  // R8
+
+  abstract static class A {
+
+    public abstract void m();
+  }
+
+  abstract static class B extends A {
+
+    @Override
+    public void m() {
+      System.out.println("Hello, world!");
+    }
+  }
+}
diff --git a/src/test/java/com/android/tools/r8/shaking/AbstractMethodWithOpenHierarchyTest.java b/src/test/java/com/android/tools/r8/shaking/AbstractMethodWithOpenHierarchyTest.java
new file mode 100644
index 0000000..8de48b5
--- /dev/null
+++ b/src/test/java/com/android/tools/r8/shaking/AbstractMethodWithOpenHierarchyTest.java
@@ -0,0 +1,65 @@
+// Copyright (c) 2025, 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;
+
+import com.android.tools.r8.TestBase;
+import com.android.tools.r8.TestParameters;
+import com.android.tools.r8.TestParametersCollection;
+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 AbstractMethodWithOpenHierarchyTest extends TestBase {
+
+  @Parameter(0)
+  public TestParameters parameters;
+
+  @Parameters(name = "{0}")
+  public static TestParametersCollection data() {
+    return getTestParameters().withAllRuntimesAndApiLevels().build();
+  }
+
+  @Test
+  public void test() throws Exception {
+    testForR8(parameters.getBackend())
+        .addProgramClasses(A.class, B.class)
+        .addKeepClassAndMembersRules(A.class)
+        .addKeepClassAndDefaultConstructor(B.class)
+        .setMinApi(parameters)
+        .compile()
+        .addRunClasspathClasses(Main.class, C.class)
+        .run(parameters.getRuntime(), Main.class)
+        .assertSuccessWithOutputLines("Hello, world!");
+  }
+
+  // D8
+
+  static class Main {
+
+    public static void main(String[] args) {
+      A a = new C();
+      a.m();
+    }
+  }
+
+  static class C extends B {}
+
+  // R8
+
+  abstract static class A {
+
+    public abstract void m();
+  }
+
+  abstract static class B extends A {
+
+    @Override
+    public void m() {
+      System.out.println("Hello, world!");
+    }
+  }
+}
diff --git a/src/test/java/com/android/tools/r8/shaking/DefaultInterfaceMethodWithOpenHierarchyTest.java b/src/test/java/com/android/tools/r8/shaking/DefaultInterfaceMethodWithOpenHierarchyTest.java
new file mode 100644
index 0000000..8e592d1
--- /dev/null
+++ b/src/test/java/com/android/tools/r8/shaking/DefaultInterfaceMethodWithOpenHierarchyTest.java
@@ -0,0 +1,64 @@
+// Copyright (c) 2025, 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;
+
+import com.android.tools.r8.TestBase;
+import com.android.tools.r8.TestParameters;
+import com.android.tools.r8.TestParametersCollection;
+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 DefaultInterfaceMethodWithOpenHierarchyTest extends TestBase {
+
+  @Parameter(0)
+  public TestParameters parameters;
+
+  @Parameters(name = "{0}")
+  public static TestParametersCollection data() {
+    return getTestParameters().withAllRuntimesAndApiLevels().build();
+  }
+
+  @Test
+  public void test() throws Exception {
+    testForR8(parameters.getBackend())
+        .addProgramClasses(I.class, J.class)
+        .addKeepClassAndMembersRules(I.class)
+        .addKeepClassRules(J.class)
+        .setMinApi(parameters)
+        .compile()
+        .addRunClasspathClasses(Main.class, A.class)
+        .run(parameters.getRuntime(), Main.class)
+        .assertFailureWithErrorThatThrows(AbstractMethodError.class);
+  }
+
+  // D8
+
+  static class Main {
+
+    public static void main(String[] args) {
+      I i = new A();
+      i.m();
+    }
+  }
+
+  static class A implements J {}
+
+  // R8
+
+  interface I {
+
+    void m();
+  }
+
+  interface J extends I {
+
+    default void m() {
+      System.out.println("Hello, world!");
+    }
+  }
+}