fix test_keyfile

keyfile is not part of cache keys so the expectations are wrong.

We don't make it part of cache keys because we don't expect keyfile to
affect the version as long as we can get it.

tests/conftest.py

@@ -5,6 +5,7 @@ import io
 import structlog
 
 from nvchecker.get_version import get_version as _get_version
+from nvchecker.get_version import _cache
 from nvchecker.core import Source
 
 class TestSource(Source):
@@ -22,7 +23,10 @@ class TestSource(Source):
     self._future.set_exception(exc)
 
 @pytest.fixture(scope="module")
-async def run_source():
+async def run_source(*, clear_cache=False):
+  if clear_cache:
+    _cache.clear()
+
   async def __call__(conf):
     future = asyncio.Future()
     file = io.StringIO(conf)

tests/test_keyfile.py

@@ -46,7 +46,7 @@ keyfile = {name}
 '''.format(name=f.name)
 
     try:
-      version = await run_source(test_conf)
+      version = await run_source(test_conf, clear_cache=True)
       assert version is None # out of allowance
       return
     except HTTPError as e: