Continue adding tests

python/tests/conftest.py

@@ -4,7 +4,7 @@
 
 import pytest
 
-from psqlpy import PSQLPool
+from psqlpy import Cursor, PSQLPool
 
 
 @pytest.fixture()
@@ -96,3 +96,18 @@ async def create_deafult_data_for_tests(
     await psql_pool.execute(
         f"DROP TABLE {table_name}",
     )
+
+
+@pytest.fixture()
+async def test_cursor(
+    psql_pool: PSQLPool,
+    table_name: str,
+) -> AsyncGenerator[Cursor, None]:
+    connection = await psql_pool.connection()
+    transaction = connection.transaction()
+    await transaction.begin()
+    cursor = await transaction.cursor(
+        querystring=f"SELECT * FROM {table_name}",
+    )
+    yield cursor
+    await transaction.commit()

python/tests/test_cursor.py

@@ -1,19 +1,64 @@
 import pytest
 
-from psqlpy import PSQLPool
+from psqlpy import Cursor
 
 
 @pytest.mark.anyio
 async def test_cursor_fetch(
-    psql_pool: PSQLPool,
-    table_name: str,
     number_database_records: int,
+    test_cursor: Cursor,
 ) -> None:
-    connection = await psql_pool.connection()
-    transaction = connection.transaction()
-    await transaction.begin()
-    await transaction.cursor(
-        querystring=f"SELECT * FROM {table_name}",
+    """Test cursor fetch with custom number of fetch."""
+    result = await test_cursor.fetch(fetch_number=number_database_records // 2)
+    assert len(result.result()) == number_database_records // 2
+
+
+@pytest.mark.anyio
+async def test_cursor_fetch_next(
+    test_cursor: Cursor,
+) -> None:
+    """Test cursor fetch next."""
+    result = await test_cursor.fetch_next()
+    assert len(result.result()) == 1
+
+
+@pytest.mark.anyio
+async def test_cursor_fetch_prior(
+    test_cursor: Cursor,
+) -> None:
+    """Test cursor fetch prior."""
+    result = await test_cursor.fetch_prior()
+    assert len(result.result()) == 0
+
+    await test_cursor.fetch(fetch_number=2)
+    result = await test_cursor.fetch_prior()
+    assert len(result.result()) == 1
+
+
+@pytest.mark.anyio
+async def test_cursor_fetch_first(
+    test_cursor: Cursor,
+) -> None:
+    """Test cursor fetch first."""
+    fetch_first = await test_cursor.fetch(fetch_number=1)
+
+    await test_cursor.fetch(fetch_number=3)
+
+    first = await test_cursor.fetch_first()
+
+    assert fetch_first.result() == first.result()
+
+
+@pytest.mark.anyio
+async def test_cursor_fetch_last(
+    test_cursor: Cursor,
+    number_database_records: int,
+) -> None:
+    """Test cursor fetch last."""
+    all_res = await test_cursor.fetch(
+        fetch_number=number_database_records,
     )
 
-    await transaction.commit()
+    last_res = await test_cursor.fetch_last()
+
+    assert all_res.result()[-1] == last_res.result()[0]