Added test for checking benchmark IDs

We check that the ids are indeed different if we generate
two benchmarks correctly

core/src/test/java/SyntheticBenchmarkTest.java

@@ -459,5 +459,33 @@ public class SyntheticBenchmarkTest {
 
         Assert.assertEquals(expected, bench.methodNormalizedHistogram());
     }
+
+    @Test
+    public void testTraceBenchmarkIdentifier() {
+        List<String> trace1 = List.of(
+                "runAdd",
+                "runAdd",
+                "runGet"
+        );
+
+        BCBenchmarkPackage<List<Object>> bench = BCBenchmarkPackage.LIST(
+                "Trace1",
+                trace1,
+                new ArrayList<>());
+
+        List<String> trace2 = List.of(
+                "runAdd",
+                "runGet",
+                "runAdd"
+        );
+
+        BCBenchmarkPackage<List<Object>> bench2 = BCBenchmarkPackage.LIST(
+                "Trace2",
+                trace2,
+                new ArrayList<>());
+
+        // The IDs are the same if you use the same trace key!
+        Assert.assertNotEquals(bench.getBenchmarkIdentifier(), bench2.getBenchmarkIdentifier());
+    }
 }