Add recursive rm test (fsspec#613)

* Add recursive rm test

* update black in pre-commit

* newlint

Author: martindurant

.pre-commit-config.yaml

@@ -6,7 +6,7 @@ repos:
       - id: end-of-file-fixer
       - id: trailing-whitespace
   - repo: https://github.com/psf/black
-    rev: 22.1.0
+    rev: 22.3.0
     hooks:
       - id: black
         exclude: ^docs/

s3fs/tests/test_s3fs.py

@@ -2274,6 +2274,25 @@ def test_lsdir(s3):
     assert d in s3.ls(test_bucket_name)
 
 
+def test_rm_recursive_folder(s3):
+    s3.touch(test_bucket_name + "/sub/file")
+    s3.rm(test_bucket_name + "/sub", recursive=True)
+    assert not s3.exists(test_bucket_name + "/sub/file")
+    assert not s3.exists(test_bucket_name + "/sub")
+
+    s3.touch(test_bucket_name + "/sub/file")
+    s3.touch(test_bucket_name + "/sub/")  # placeholder
+    s3.rm(test_bucket_name + "/sub", recursive=True)
+    assert not s3.exists(test_bucket_name + "/sub/file")
+    assert not s3.exists(test_bucket_name + "/sub")
+
+    s3.touch(test_bucket_name + "/sub/file")
+    s3.rm(test_bucket_name, recursive=True)
+    assert not s3.exists(test_bucket_name + "/sub/file")
+    assert not s3.exists(test_bucket_name + "/sub")
+    assert not s3.exists(test_bucket_name)
+
+
 def test_copy_file_without_etag(s3, monkeypatch):
 
     s3.touch(test_bucket_name + "/copy_tests/file")