Make it a runtime error to use buildParameters() with one argument

Change-Id: I14bd8a20d4a7db58be3654347646587425207005

src/test/java/com/android/tools/r8/TestBase.java

diff --git a/src/test/java/com/android/tools/r8/TestBase.java b/src/test/java/com/android/tools/r8/TestBase.java
index 98f30d5..a2f3ebc 100644
--- a/src/test/java/com/android/tools/r8/TestBase.java
+++ b/src/test/java/com/android/tools/r8/TestBase.java
@@ -976,6 +976,7 @@
   }
 
   protected static List<Object[]> buildParameters(Object... arraysOrIterables) {
+    assertTrue(arraysOrIterables.length > 1);
     Function<Object, List<Object>> arrayOrIterableToList =
         arrayOrIterable -> {
           if (arrayOrIterable.getClass().isArray()) {