test: fix test_append_adds_examples to reflect Phoenix versioning semantics

Author: zurfjereluhmie

.github/workflows/ci.yml

@@ -69,7 +69,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        phoenix-major: [13, 14]
+        phoenix-major: [13, 14, 15]
 
     steps:
       - uses: actions/checkout@v6

tests/integration/test_uploader_integration.py

@@ -80,15 +80,14 @@ def test_append_adds_examples(self, phoenix_client, tmp_path: Path):
         DatasetUploader(csv_path=csv_2, phoenix_client=phoenix_client).upload(
             on_exist="skip"
         )
+        count_before = len(phoenix_client.datasets.get_dataset(dataset=tag))
 
         DatasetUploader(csv_path=csv_3, phoenix_client=phoenix_client).upload(
             on_exist="append"
         )
-
-        # Phoenix creates a new version per upload; get_dataset returns the
-        # latest version which contains only the 3 newly appended examples.
         count_after = len(phoenix_client.datasets.get_dataset(dataset=tag))
-        assert count_after == 3
+
+        assert count_after == count_before + 3
 
     def test_custom_keys(self, phoenix_client, tmp_path: Path):
         import uuid