Add missing Playground tests

tests/full_data.rs

@@ -29,3 +29,14 @@ fn trash_compactor() {
         )
     );
 }
+
+#[test]
+fn playground() {
+    assert_eq!(
+        Ok((352584, 0)),
+        solvers::run_solver(
+            solvers::playground::Playground::new(None),
+            &solvers::DATA_PATHS
+        )
+    );
+}