fail if artifact does not existing (#1947)

tests/e2e/solc_parsing/test_ast_parsing.py

@@ -495,12 +495,9 @@ class TestASTParsing:
 
         actual = generate_output(sl)
 
-        try:
+        assert os.path.isfile(expected), f"Expected file {expected} does not exist"
         with open(expected, "r", encoding="utf8") as f:
             expected = json.load(f)
-        except OSError:
-            pytest.xfail("the file for this test was not generated")
-            raise
 
         diff = DeepDiff(expected, actual, ignore_order=True, verbose_level=2, view="tree")
         if diff:

tests/e2e/solc_parsing/test_data/expected/yul-top-level-0.8.0.sol-0.8.0-compact.json

@@ -0,0 +1,5 @@
+{
+  "Test": {
+    "test()": "digraph{\n0[label=\"Node Type: ENTRY_POINT 0\n\"];\n0->1;\n1[label=\"Node Type: EXPRESSION 1\n\"];\n}\n"
+  }
+}