diff --git a/src/healthchecks_io/client/_abstract.py b/src/healthchecks_io/client/_abstract.py
index 89ecd0a..f253c0a 100644
--- a/src/healthchecks_io/client/_abstract.py
+++ b/src/healthchecks_io/client/_abstract.py
@@ -44,12 +44,14 @@ class AbstractClient(ABC):
         self._finalizer = finalize(self, self._finalizer_method)
 
     @abstractmethod
-    def _finalizer_method(self):
+    def _finalizer_method(self):  # pragma: no cover
         """Finalizer method is called by weakref.finalize when the object is dereferenced to do cleanup of clients."""
         pass
 
     @abstractmethod
-    def get_checks(self, tags: Optional[List[str]]) -> List[checks.Check]:
+    def get_checks(
+        self, tags: Optional[List[str]]
+    ) -> List[checks.Check]:  # pragma: no cover
         """Calls the API's /checks/ endpoint to get a list of checks."""
         pass
 
diff --git a/tests/client/test_abstract.py b/tests/client/test_abstract.py
new file mode 100644
index 0000000..7ba2318
--- /dev/null
+++ b/tests/client/test_abstract.py
@@ -0,0 +1,10 @@
+from healthchecks_io.client._abstract import AbstractClient
+
+
+def test_abstract_add_url_params():
+    AbstractClient.__abstractmethods__ = set()
+    abstract_client = AbstractClient("test")
+    url = abstract_client._add_url_params(
+        "http://test.com/?test=test", {"test": "test2"}
+    )
+    assert url == "http://test.com/?test=test2"