Add test cases for stability

tosfs/tests/test_stability.py

@@ -0,0 +1,51 @@
+# ByteDance Volcengine EMR, Copyright 2024.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from time import sleep
+
+from tosfs.utils import random_str
+
+
+def test_write_breakpoint_continuation(tosfs, bucket, temporary_workspace):
+    file_name = f"{random_str()}.txt"
+    first_part = random_str(10 * 1024 * 1024)
+    second_part = random_str(10 * 1024 * 1024)
+
+    with tosfs.open(f"{bucket}/{temporary_workspace}/{file_name}", "w") as f:
+        f.write(first_part)
+        # mock a very long block(business processing or network issue)
+        sleep(60)
+        f.write(second_part)
+
+    with tosfs.open(file_name, "r") as f:
+        assert f.read() == first_part + second_part
+
+
+def test_read_breakpoint_continuation(tosfs, bucket, temporary_workspace):
+    file_name = f"{random_str()}.txt"
+    first_part = random_str(10 * 1024 * 1024)
+    second_part = random_str(10 * 1024 * 1024)
+
+    with tosfs.open(f"{bucket}/{temporary_workspace}/{file_name}", "w") as f:
+        f.write(first_part)
+        f.write(second_part)
+
+    with tosfs.open(file_name, "r") as f:
+        read_first_part = f.read(10 * 1024 * 1024)
+        assert read_first_part == first_part
+        # mock a very long block(business processing or network issue)
+        sleep(60)
+        read_second_part = f.read(10 * 1024 * 1024)
+        assert read_second_part == second_part
+        assert read_first_part + read_second_part == first_part + second_part