make it easier to run specific tests and document

CONTRIBUTING.md

@@ -64,7 +64,10 @@ For each new detector, at least one regression tests must be present.
   - If updating an existing detector, identify the respective json artifacts and then delete them, or run `python ./tests/test_detectors.py --overwrite` instead.
 - Run `pytest ./tests/test_detectors.py` and check that everything worked.
 
-To see the tests coverage, run `pytest  tests/test_detectors.py  --cov=slither/detectors --cov-branch --cov-report html`
+To see the tests coverage, run `pytest  tests/test_detectors.py  --cov=slither/detectors --cov-branch --cov-report html`.
+To run tests for a specific detector, run `pytest tests/test_detectors.py -k ReentrancyReadBeforeWritten` (the detector's class name is the argument).
+To run tests for a specific version, run `pytest tests/test_detectors.py -k 0.7.6`.
+The id's of tests can be inspected using ``pytest tests/test_detectors.py --collect-only`.
 
 ### Parser tests
 - Create a test in `tests/ast-parsing`
@@ -73,6 +76,10 @@ To see the tests coverage, run `pytest  tests/test_detectors.py  --cov=slither/d
 - Run `pytest ./tests/test_ast_parsing.py` and check that everything worked.
 
 To see the tests coverage, run `pytest  tests/test_ast_parsing.py  --cov=slither/solc_parsing --cov-branch --cov-report html`
+To run tests for a specific test case, run `pytest tests/test_ast_parsing.py -k user_defined_value_type`  (the file name is the argument).
+To run tests for a specific version, run `pytest tests/test_ast_parsing.py -k 0.8.12`.
+To run tests for a specific compiler json format, run `pytest tests/test_ast_parsing.py -k legacy` (can be legacy or compact).
+The id's of tests can be inspected using ``pytest tests/test_ast_parsing.py --collect-only`.
 
 ### Synchronization with crytic-compile
 By default, `slither` follows either the latest version of crytic-compile in pip, or `crytic-compile@master` (look for dependencies in [`setup.py`](./setup.py). If crytic-compile development comes with breaking changes, the process to update `slither` is:

tests/test_ast_parsing.py

@@ -433,18 +433,19 @@ except OSError:
     pass
 
 
-@pytest.mark.parametrize("test_item", ALL_TESTS, ids=lambda x: x.test_file)
-def test_parsing(test_item: Test):
-    flavors = ["compact"]
-    if not test_item.disable_legacy:
-        flavors += ["legacy"]
-    for version, flavor in test_item.versions_with_flavors:
-        test_file = os.path.join(
-            TEST_ROOT, "compile", f"{test_item.test_file}-{version}-{flavor}.zip"
-        )
-        expected_file = os.path.join(
-            TEST_ROOT, "expected", f"{test_item.test_file}-{version}-{flavor}.json"
-        )
+def pytest_generate_tests(metafunc):
+    test_cases = []
+    for test_item in ALL_TESTS:
+        for version, flavor in test_item.versions_with_flavors:
+            test_cases.append((test_item.test_file, version, flavor))
+    metafunc.parametrize("test_file, version, flavor", test_cases)
+
+
+class TestASTParsing:
+    # pylint: disable=no-self-use
+    def test_parsing(self, test_file, version, flavor):
+        test_file = os.path.join(TEST_ROOT, "compile", f"{test_file}-{version}-{flavor}.zip")
+        expected_file = os.path.join(TEST_ROOT, "expected", f"{test_file}-{version}-{flavor}.json")
 
         cc = load_from_zip(test_file)[0]
 
@@ -465,19 +466,18 @@ def test_parsing(test_item: Test):
             raise
 
         diff = DeepDiff(expected, actual, ignore_order=True, verbose_level=2, view="tree")
-
         if diff:
             for change in diff.get("values_changed", []):
                 path_list = re.findall(r"\['(.*?)'\]", change.path())
                 path = "_".join(path_list)
                 with open(
-                    f"test_artifacts/{test_item.test_file}_{path}_expected.dot",
+                    f"test_artifacts/{test_file}_{path}_expected.dot",
                     "w",
                     encoding="utf8",
                 ) as f:
                     f.write(change.t1)
                 with open(
-                    f"test_artifacts/{test_item.test_file}_{version}_{flavor}_{path}_actual.dot",
+                    f"test_artifacts/{test_file}_{version}_{flavor}_{path}_actual.dot",
                     "w",
                     encoding="utf8",
                 ) as f:

tests/test_detectors.py

@@ -52,7 +52,7 @@ def set_solc(test_item: Test):  # pylint: disable=too-many-lines
 
 
 def id_test(test_item: Test):
-    return f"{test_item.detector}: {test_item.solc_ver}/{test_item.test_file}"
+    return f"{test_item.detector.__name__}-{test_item.solc_ver}-{test_item.test_file}"
 
 
 ALL_TEST_OBJECTS = [