Add test for load_to()

tests/test_attachments.py

@@ -0,0 +1,53 @@
+import os
+
+import audeer
+import audformat
+
+import audb
+
+
+def test_loading_multiple_attachments(tmpdir, repository):
+    r"""Test loading of databases containing multiple attachments.
+
+    As described in https://github.com/audeering/audb/issues/313,
+    ``audb.load_to()`` might struggle to load all attachments.
+
+    """
+    db_name = "db"
+    db_version = "1.0.0"
+    db_root = audeer.mkdir(tmpdir, db_name)
+    db = audformat.Database(db_name)
+    # Include four different folders as attachment
+    folders = [
+        os.path.join("a", "a"),
+        os.path.join("a", "b"),
+        os.path.join("b", "a"),
+        os.path.join("c", "a"),
+    ]
+    files = [
+        os.path.join("a", "a", "file-a-a-1"),
+        os.path.join("a", "a", "file-a-a-2"),
+        os.path.join("a", "b", "file-a-b-1"),
+        os.path.join("a", "b", "file-a-b-2"),
+        os.path.join("b", "a", "file-b-a-1"),
+        os.path.join("b", "a", "file-b-a-2"),
+        os.path.join("c", "a", "file-c-a-1"),
+        os.path.join("c", "a", "file-c-a-2"),
+    ]
+    for folder in folders:
+        audeer.mkdir(db_root, folder)
+    for file in files:
+        audeer.touch(db_root, file)
+    db.attachments["a-a"] = audformat.Attachment("a/a/")
+    db.attachments["a-b"] = audformat.Attachment("a/b/")
+    db.attachments["b-a"] = audformat.Attachment("b/a/")
+    db.attachments["c-a"] = audformat.Attachment("c/a/")
+    db.save(db_root)
+
+    audb.publish(db_root, db_version, repository)
+
+    build_dir = audeer.mkdir(tmpdir, "build")
+    audb.load_to(build_dir, db_name, version=db_version, verbose=False)
+
+    for file in files:
+        assert os.path.exists(audeer.path(build_dir, file))