Add part delete cases (#9822)

Signed-off-by: ThreadDao <yufen.zong@zilliz.com>

tests/python_client/testcases/test_delete_20.py

@@ -1,11 +1,54 @@
 import pytest
 
 from base.client_base import TestcaseBase
+# from common import common_func as cf
+from common import common_type as ct
+# from utils.util_log import test_log as log
+from common.common_type import CaseLabel
+
+prefix = "delete"
 
 
-@pytest.mark.skip(reason="Waiting for development")
 class TestDeleteParams(TestcaseBase):
-    pass
+    """
+    Test case of delete interface
+    def delete(expr, partition_name=None, timeout=None, **kwargs)
+    return MutationResult
+    Only the `in` operator is supported in the expr
+    """
+
+    @pytest.mark.skip(reason="Delete function is not implemented")
+    @pytest.mark.tags(CaseLabel.L0)
+    def test_delete(self):
+        """
+        target: test delete data from collection
+        method: 1.create and insert nb
+                2. delete half of nb
+        expected: assert num entities
+        """
+        # init collection with nb default data
+        collection_w, data = self.init_collection_general(prefix, insert_data=True)[:2]
+        assert collection_w.num_entities == ct.default_nb
+        half = ct.default_nb // 2
+        expr = f'{ct.default_int64_field_name} in {data[0][:half]}'
+        # delete half of data
+        collection_w.delete(expr)
+        assert collection_w.num_entities == half
+
+    @pytest.mark.skip(reason="Delete function is not implemented")
+    @pytest.mark.tags(CaseLabel.L1)
+    def test_delete_empty(self):
+        """
+        target: test delete with empty array expr
+        method: delete with expr: "id in []"
+        expected: assert num entities
+        """
+        # init collection with nb default data
+        collection_w = self.init_collection_general(prefix, insert_data=True)[0]
+        expr = f'{ct.default_int64_field_name} in {[]}'
+        # delete half of data
+        collection_w.delete(expr)
+        assert collection_w.num_entities == ct.default_nb
 
 
 @pytest.mark.skip(reason="Waiting for development")