diff --git a/staticlibs/testutils/devicetests/com/android/testutils/TestPermissionUtil.kt b/staticlibs/testutils/devicetests/com/android/testutils/TestPermissionUtil.kt
index a4dbd9a..f571f64 100644
--- a/staticlibs/testutils/devicetests/com/android/testutils/TestPermissionUtil.kt
+++ b/staticlibs/testutils/devicetests/com/android/testutils/TestPermissionUtil.kt
@@ -20,8 +20,8 @@
 
 import androidx.test.platform.app.InstrumentationRegistry
 import com.android.modules.utils.build.SdkLevel
-import com.android.testutils.ExceptionUtils.ThrowingRunnable
-import com.android.testutils.ExceptionUtils.ThrowingSupplier
+import com.android.testutils.FunctionalUtils.ThrowingRunnable
+import com.android.testutils.FunctionalUtils.ThrowingSupplier
 
 /**
  * Run the specified [task] with the specified [permissions] obtained through shell
diff --git a/staticlibs/testutils/hostdevice/com/android/testutils/Cleanup.kt b/staticlibs/testutils/hostdevice/com/android/testutils/Cleanup.kt
index 3db357b..9f28234 100644
--- a/staticlibs/testutils/hostdevice/com/android/testutils/Cleanup.kt
+++ b/staticlibs/testutils/hostdevice/com/android/testutils/Cleanup.kt
@@ -18,8 +18,8 @@
 
 package com.android.testutils
 
-import com.android.testutils.ExceptionUtils.ThrowingRunnable
-import com.android.testutils.ExceptionUtils.ThrowingSupplier
+import com.android.testutils.FunctionalUtils.ThrowingRunnable
+import com.android.testutils.FunctionalUtils.ThrowingSupplier
 import javax.annotation.CheckReturnValue
 
 /**
diff --git a/staticlibs/testutils/hostdevice/com/android/testutils/ExceptionUtils.java b/staticlibs/testutils/hostdevice/com/android/testutils/FunctionalUtils.java
similarity index 74%
rename from staticlibs/testutils/hostdevice/com/android/testutils/ExceptionUtils.java
rename to staticlibs/testutils/hostdevice/com/android/testutils/FunctionalUtils.java
index d3bda98..da36e4d 100644
--- a/staticlibs/testutils/hostdevice/com/android/testutils/ExceptionUtils.java
+++ b/staticlibs/testutils/hostdevice/com/android/testutils/FunctionalUtils.java
@@ -21,7 +21,7 @@
 /**
  * A class grouping some utilities to deal with exceptions.
  */
-public class ExceptionUtils {
+public class FunctionalUtils {
     /**
      * Like a Consumer, but declared to throw an exception.
      * @param <T>
@@ -79,4 +79,21 @@
             }
         };
     }
+
+    // Java has Function<T, R> and BiFunction<T, U, V> but nothing for higher-arity functions.
+    // Function3 is what Kotlin and Scala use (they also have higher-arity variants, with
+    // FunctionN taking N arguments, as the JVM does not have variadic formal parameters)
+    /**
+     * A function with three arguments.
+     * @param <TArg1> Type of the first argument
+     * @param <TArg2> Type of the second argument
+     * @param <TArg3> Type of the third argument
+     * @param <TResult> Type of the return value
+     */
+    public interface Function3<TArg1, TArg2, TArg3, TResult> {
+        /**
+         * Apply the function to the arguments
+         */
+        TResult apply(TArg1 a1, TArg2 a2, TArg3 a3);
+    }
 }
diff --git a/staticlibs/testutils/hostdevice/com/android/testutils/MiscAsserts.kt b/staticlibs/testutils/hostdevice/com/android/testutils/MiscAsserts.kt
index efd9402..1883387 100644
--- a/staticlibs/testutils/hostdevice/com/android/testutils/MiscAsserts.kt
+++ b/staticlibs/testutils/hostdevice/com/android/testutils/MiscAsserts.kt
@@ -18,7 +18,7 @@
 
 package com.android.testutils
 
-import com.android.testutils.ExceptionUtils.ThrowingRunnable
+import com.android.testutils.FunctionalUtils.ThrowingRunnable
 import java.lang.reflect.Modifier
 import kotlin.system.measureTimeMillis
 import kotlin.test.assertEquals