diff --git a/src/test/java/com/android/tools/r8/desugar/backports/AbstractBackportTest.java b/src/test/testbase/java/com/android/tools/r8/desugar/backports/AbstractBackportTest.java
similarity index 94%
rename from src/test/java/com/android/tools/r8/desugar/backports/AbstractBackportTest.java
rename to src/test/testbase/java/com/android/tools/r8/desugar/backports/AbstractBackportTest.java
index 4c2c44a..c9e7983 100644
--- a/src/test/java/com/android/tools/r8/desugar/backports/AbstractBackportTest.java
+++ b/src/test/testbase/java/com/android/tools/r8/desugar/backports/AbstractBackportTest.java
@@ -36,7 +36,7 @@
 import org.junit.Assert;
 import org.junit.Test;
 
-abstract class AbstractBackportTest extends TestBase {
+public abstract class AbstractBackportTest extends TestBase {
   protected final TestParameters parameters;
   private final ClassInfo targetClass;
   private final ClassInfo testClass;
@@ -85,22 +85,22 @@
     }
   }
 
-  AbstractBackportTest(TestParameters parameters, Class<?> targetClass,
-      Class<?> testClass) {
+  protected AbstractBackportTest(
+      TestParameters parameters, Class<?> targetClass, Class<?> testClass) {
     this(parameters, new ClassInfo(targetClass), new ClassInfo(testClass), null, null);
   }
 
-  AbstractBackportTest(
+  protected AbstractBackportTest(
       TestParameters parameters, Class<?> targetClass, List<byte[]> testClassFileData) {
     this(parameters, new ClassInfo(targetClass), new ClassInfo(testClassFileData), null, null);
   }
 
-  AbstractBackportTest(
+  protected AbstractBackportTest(
       TestParameters parameters, String className, List<byte[]> testClassFileData) {
     this(parameters, new ClassInfo(className), new ClassInfo(testClassFileData), null, null);
   }
 
-  AbstractBackportTest(
+  protected AbstractBackportTest(
       TestParameters parameters, byte[] targetClassFileData, List<byte[]> testClassFileData) {
     this(
         parameters,
@@ -110,8 +110,8 @@
         null);
   }
 
-  AbstractBackportTest(TestParameters parameters, Class<?> targetClass,
-      Path testJar, String testClassName) {
+  public AbstractBackportTest(
+      TestParameters parameters, Class<?> targetClass, Path testJar, String testClassName) {
     this(parameters, new ClassInfo(targetClass), null, testJar, testClassName);
   }
 
@@ -140,7 +140,7 @@
     invokeStaticCounts.put(AndroidApiLevel.B.getLevel(), 0);
   }
 
-  void registerTarget(AndroidApiLevel apiLevel, int invokeStaticCount) {
+  protected void registerTarget(AndroidApiLevel apiLevel, int invokeStaticCount) {
     invokeStaticCounts.put(apiLevel.getLevel(), invokeStaticCount);
   }
 
@@ -149,7 +149,7 @@
     return invokeStaticCounts.get(key);
   }
 
-  void ignoreInvokes(String methodName) {
+  protected void ignoreInvokes(String methodName) {
     ignoredInvokes.add(methodName);
   }
 
@@ -250,7 +250,7 @@
   }
 
   /** JUnit {@link Assert} isn't available in the VM runtime. This is a mini mirror of its API. */
-  static abstract class MiniAssert {
+  public abstract static class MiniAssert {
     static void assertTrue(boolean value) {
       assertEquals(true, value);
     }
diff --git a/src/test/java/com/android/tools/r8/desugar/backports/IgnoreInvokes.java b/src/test/testbase/java/com/android/tools/r8/desugar/backports/IgnoreInvokes.java
similarity index 72%
rename from src/test/java/com/android/tools/r8/desugar/backports/IgnoreInvokes.java
rename to src/test/testbase/java/com/android/tools/r8/desugar/backports/IgnoreInvokes.java
index 2e61664..76aa62c 100644
--- a/src/test/java/com/android/tools/r8/desugar/backports/IgnoreInvokes.java
+++ b/src/test/testbase/java/com/android/tools/r8/desugar/backports/IgnoreInvokes.java
@@ -11,13 +11,12 @@
 import java.lang.annotation.Target;
 
 /**
- * Denote a method that contains invoke instructions on the target class which should be ignored
- * in the counts. This is useful for using other functionality of the target class to verify the
+ * Denote a method that contains invoke instructions on the target class which should be ignored in
+ * the counts. This is useful for using other functionality of the target class to verify the
  * behavior of the backport.
  *
- * Methods with this annotation will never be inlined.
+ * <p>Methods with this annotation will never be inlined.
  */
 @Target(METHOD)
 @Retention(RUNTIME)
-@interface IgnoreInvokes {
-}
+public @interface IgnoreInvokes {}