test: migrate test case from test_alias to test_milvus_client_alias (#43802)

issue: [#43793](https://github.com/milvus-io/milvus/issues/43793)

- migrate test_alias_create_operation_default() to
test_milvus_client_alias_create_operation_default()

Co-authored-by: Eric Hou <eric.hou@zilliz.com>

tests/python_client/milvus_client/test_milvus_client_alias.py

@@ -494,3 +494,37 @@ class TestMilvusClientAliasValid(TestMilvusClientV2Base):
         self.drop_alias(client, alias)
         self.drop_alias(client, another_alias)
         self.drop_collection(client, collection_name)
+
+class TestMilvusClientAliasOperation(TestMilvusClientV2Base):
+    """ This is a migration test case for alias operation """
+
+    @pytest.mark.tags(CaseLabel.L1)
+    def test_milvus_client_alias_create_operation_default(self):
+        """
+        target: test collection creating alias
+        method: 
+                1.create a collection and create 10 partitions for it
+                2.collection create an alias, then init a collection with this alias but not create partitions
+        expected: collection is equal to alias
+        """
+        client = self._client()
+        collection_name = cf.gen_unique_str(prefix)
+
+        # Create the collection before creating partitions
+        self.create_collection(client, collection_name, default_dim, consistency_level="Strong")
+
+        # method 1: create partitions and check the partition exists
+        for _ in range(10):
+            partition_name = cf.gen_unique_str("partition")
+            # create partition with different names and check the partition exists
+            self.create_partition(client, collection_name, partition_name)
+
+        # method 2: create alias from collection, then init a collection with this alias but not create partitions
+        alias = cf.gen_unique_str(prefix)
+        self.create_alias(client, collection_name, alias)
+        # assert collection is equal to alias according to partitions
+        partition_name_list = self.list_partitions(client, collection_name)[0]
+        partition_name_list_alias = self.list_partitions(client, alias)[0]
+        assert partition_name_list == partition_name_list_alias
+        self.drop_alias(client, alias)
+        self.drop_collection(client, collection_name)

tests/python_client/testcases/test_alias.py

@@ -100,6 +100,9 @@ class TestAliasOperation(TestcaseBase):
         res1 = collection_alias.query(expr="", output_fields=["count(*)"])[0]
         assert res1[0].get("count(*)") == nb2
 
+    #########################################################
+    # test_alias_create_operation_default() migrated to milvus_client
+    #########################################################
     @pytest.mark.tags(CaseLabel.L1)
     def test_alias_create_operation_default(self):
         """