Add a test case for evaluating an empty collection of SkyKeys

PiperOrigin-RevId: 239862408

src/test/java/com/google/devtools/build/skyframe/MemoizingEvaluatorTest.java

diff --git a/src/test/java/com/google/devtools/build/skyframe/MemoizingEvaluatorTest.java b/src/test/java/com/google/devtools/build/skyframe/MemoizingEvaluatorTest.java
index 200cf3b..07953b2 100644
--- a/src/test/java/com/google/devtools/build/skyframe/MemoizingEvaluatorTest.java
+++ b/src/test/java/com/google/devtools/build/skyframe/MemoizingEvaluatorTest.java
@@ -212,6 +212,12 @@
   }
 
   @Test
+  public void evaluateEmptySet() throws InterruptedException {
+    tester.eval(false, new SkyKey[0]);
+    tester.eval(true, new SkyKey[0]);
+  }
+
+  @Test
   public void invalidationWithNothingChanged() throws Exception {
     tester.set("x", new StringValue("y")).setWarning("fizzlepop");
     StringValue value = (StringValue) tester.evalAndGet("x");