Fix bug in tests

tests/conftest.py

@@ -291,10 +291,13 @@ def _(code: str, has_branches: bool = True) -> coverage_module.Coverage:
         )
         line_number = 0
         # (we start at 0 because the first line will be empty for readabilty)
-        for line in code.splitlines()[1:]:
+        for line in code.splitlines():
             line = line.strip()
+            if not line:
+                continue
             if line.startswith("# file: "):
                 current_file = pathlib.Path(line.split("# file: ")[1])
+                line_number = 0
                 continue
             assert current_file, (line, current_file, code)
             line_number += 1
@@ -383,8 +386,10 @@ def _(code: str) -> tuple[coverage_module.Coverage, coverage_module.DiffCoverage
         current_file = None
         # (we start at 0 because the first line will be empty for readabilty)
         line_number = 0
-        for line in code.splitlines()[1:]:
+        for line in code.splitlines():
             line = line.strip()
+            if not line:
+                continue
             if line.startswith("# file: "):
                 new_code += line + "\n"
                 current_file = pathlib.Path(line.split("# file: ")[1])

tests/unit/test_diff_grouper.py

@@ -24,8 +24,7 @@ def test_group_annotations_more_files(
     )
 
     assert list(result) == [
-        groups.Group(file=pathlib.Path("codebase/code.py"), line_start=6, line_end=8),
-        groups.Group(
-            file=pathlib.Path("codebase/other.py"), line_start=17, line_end=17
-        ),
+        groups.Group(file=pathlib.Path("codebase/code.py"), line_start=5, line_end=8),
+        groups.Group(file=pathlib.Path("codebase/other.py"), line_start=1, line_end=1),
+        groups.Group(file=pathlib.Path("codebase/other.py"), line_start=3, line_end=5),
     ]