Fix up core unit tests when a twitter api key isn't provided

pyproject.toml

@@ -74,4 +74,5 @@ documentation = "https://github.com/bellingcat/auto-archiver"
 [tool.pytest.ini_options]
 markers = [
     "download: marks tests that download content from the network",
+    "incremental: marks a class to run tests incrementally. If a test fails in the class, the remaining tests will be skipped",
 ]

tests/archivers/test_twitter_api_archiver.py

@@ -14,7 +14,7 @@ class TestTwitterApiArchiver(TestArchiverBase):
     archiver_class = TwitterApiArchiver
     config = {
         "bearer_tokens": [],
-        "bearer_token": os.environ.get("TWITTER_BEARER_TOKEN"),
+        "bearer_token": os.environ.get("TWITTER_BEARER_TOKEN", "TEST_KEY"),
         "consumer_key": os.environ.get("TWITTER_CONSUMER_KEY"),
         "consumer_secret": os.environ.get("TWITTER_CONSUMER_SECRET"),
         "access_token": os.environ.get("TWITTER_ACCESS_TOKEN"),