feat: allow empty lines in snapshot

src/syrupy/extensions/amber/serializer.py

@@ -1,5 +1,6 @@
 import collections
 import inspect
+import textwrap
 from collections import OrderedDict
 from collections.abc import Callable, Generator, Iterable
 from types import (
@@ -184,6 +185,9 @@ def __read_file_with_markers(
                             snapshot_data = ""
                     elif test_name is not None and line.startswith(cls._indent):
                         snapshot_data += line[indent_len:]
+                    elif test_name is not None and line.strip() == "":
+                        # Remove trailing whitespace (but not newline character) from empty line.
+                        snapshot_data += textwrap.dedent(line)
         except FileNotFoundError:
             pass
         else:

tests/syrupy/extensions/amber/__snapshots__/test_amber_newlines.ambr

@@ -4,6 +4,14 @@
   Line2
 
   Line3 
+
+# ---
+# name: test_multiline_repr_with_no_indentation
+  Line1
+  Line2
+
+  Line3 
+
 # ---
 # name: test_trailing_2_newlines_in_repr
   ReprWithNewline

tests/syrupy/extensions/amber/test_amber_newlines.py

@@ -26,9 +26,16 @@ def __repr__(self) -> str:
                 "Line1",
                 "Line2\n",  # extra newline
                 "Line3 ",  # with an extra space
+                "",  # newline at end
             ]
         )
 
 
 def test_multiline_repr(snapshot):
     assert MultilineRepr() == snapshot
+
+
+def test_multiline_repr_with_no_indentation(snapshot):
+    # snapshot file has been manually edited
+    # remove newlines from this test if you update the snapshot
+    assert MultilineRepr() == snapshot