#415: Add test to Selection to test an empty graph for the getAllScop…

…edValues.

It is tested indirectly by calling getAllValues with scope parameters.

core/src/test/java/io/parsingdata/metal/data/SelectionTest.java

@@ -24,6 +24,8 @@
 import static org.junit.jupiter.api.Assertions.assertTrue;
 
 import static io.parsingdata.metal.Shorthand.rep;
+import static io.parsingdata.metal.data.ParseGraph.EMPTY;
+import static io.parsingdata.metal.data.Selection.NO_LIMIT;
 import static io.parsingdata.metal.data.Selection.findItemAtOffset;
 import static io.parsingdata.metal.data.Selection.getAllValues;
 import static io.parsingdata.metal.util.EncodingFactory.enc;
@@ -54,7 +56,7 @@ private Source createSource() {
     @Test
     public void findItemAtOffsetTest() {
         assertEquals("the_one",
-            findItemAtOffset(ImmutableList.create(ParseGraph.EMPTY.add(new ParseValue("two", any("a"), Slice.createFromSource(source, BigInteger.valueOf(2), BigInteger.valueOf(2)).get(), enc()))
+            findItemAtOffset(ImmutableList.create(EMPTY.add(new ParseValue("two", any("a"), Slice.createFromSource(source, BigInteger.valueOf(2), BigInteger.valueOf(2)).get(), enc()))
                                                                   .add(new ParseValue("zero", any("a"), Slice.createFromSource(source, ZERO, BigInteger.valueOf(2)).get(), enc()))
                                                                   .add(new ParseValue("the_one", any("a"), Slice.createFromSource(source, ONE, BigInteger.valueOf(2)).get(), enc()))), ZERO, source).computeResult().get().asGraph().head.asValue().name);
         assertEquals("zero",
@@ -72,4 +74,9 @@ public void limit() {
         }
     }
 
+    @Test
+    public void emptyGraph() {
+        assertEquals(0, getAllValues(EMPTY, (value) -> true, NO_LIMIT, 2, 0).size);
+    }
+
 }