Added new tests to improve test coverage for Neo4jVector

.gitignore

@@ -8,3 +8,4 @@ __pycache__
 .idea
 .vscode
 **/.DS_Store
+.coverage

libs/neo4j/langchain_neo4j/vectorstores/neo4j_vector.py

@@ -345,11 +345,11 @@ def _handle_field_filter(
             query_snippet = f"toLower(n.`{field}`) CONTAINS $param_{param_number}"
             query_param = {f"param_{param_number}": filter_value.rstrip("%")}
             return (query_snippet, query_param)
-        else:
-            raise NotImplementedError()
     else:
         raise NotImplementedError()
 
+    raise NotImplementedError("Unhandled operator")
+
 
 def construct_metadata_filter(filter: Dict[str, Any]) -> Tuple[str, Dict]:
     """Construct a metadata filter.
@@ -386,7 +386,7 @@ def construct_metadata_filter(filter: Dict[str, Any]) -> Tuple[str, Dict]:
                 and_ = combine_queries(
                     [construct_metadata_filter(el) for el in value], "AND"
                 )
-                if len(and_) >= 1:
+                if len(and_[0]) >= 1:
                     return and_
                 else:
                     raise ValueError(
@@ -397,7 +397,7 @@ def construct_metadata_filter(filter: Dict[str, Any]) -> Tuple[str, Dict]:
                 or_ = combine_queries(
                     [construct_metadata_filter(el) for el in value], "OR"
                 )
-                if len(or_) >= 1:
+                if len(or_[0]) >= 1:
                     return or_
                 else:
                     raise ValueError(
@@ -422,7 +422,7 @@ def construct_metadata_filter(filter: Dict[str, Any]) -> Tuple[str, Dict]:
                     for index, (k, v) in enumerate(filter.items())
                 ]
             )
-            if len(and_multiple) >= 1:
+            if len(and_multiple[0]) >= 1:
                 return " AND ".join(and_multiple[0]), and_multiple[1]
             else:
                 raise ValueError(
@@ -862,7 +862,7 @@ def __from(
             embedding_dimension and not store.embedding_dimension == embedding_dimension
         ):
             raise ValueError(
-                f"Index with name {store.index_name} already exists."
+                f"Index with name {store.index_name} already exists. "
                 "The provided embedding function and vector index "
                 "dimensions do not match.\n"
                 f"Embedding function dimension: {store.embedding_dimension}\n"
@@ -1539,7 +1539,7 @@ def from_existing_graph(
             embedding_dimension and not store.embedding_dimension == embedding_dimension
         ):
             raise ValueError(
-                f"Index with name {store.index_name} already exists."
+                f"Index with name {store.index_name} already exists. "
                 "The provided embedding function and vector index "
                 "dimensions do not match.\n"
                 f"Embedding function dimension: {store.embedding_dimension}\n"

libs/neo4j/pyproject.toml

@@ -26,6 +26,7 @@ pytest-asyncio = "^0.23.2"
 pytest-socket = "^0.7.0"
 pytest-watcher = "^0.3.4"
 langchain-core = {git = "https://github.com/langchain-ai/langchain.git", subdirectory = "libs/core"}
+pytest-cov = "^6.0.0"
 
 [tool.poetry.group.codespell]
 optional = true
@@ -82,7 +83,7 @@ build-backend = "poetry.core.masonry.api"
 #                       section of the configuration file raise errors.
 #
 # https://github.com/tophat/syrupy
-addopts = "--strict-markers --strict-config --durations=5"
+addopts = "--strict-markers --strict-config --durations=5 --cov=langchain_neo4j --cov-report=html --cov-report=term"
 # Registering custom markers.
 # https://docs.pytest.org/en/7.1.x/example/markers.html#registering-markers
 markers = [