fix: normalize generated whitespace

tests/test_git_workspace.py

@@ -9,6 +9,57 @@ from lai_automation.git import GitWorkspace
 from lai_automation.models import ChangeSummary
 
 
+def test_normalize_changed_whitespace_cleans_new_text_file(
+    settings,
+    tmp_path: Path,
+) -> None:
+    workspace = GitWorkspace(replace(settings, workspace_root=tmp_path), 1)
+    workspace.path.mkdir(parents=True)
+    changed = workspace.path / "new.php"
+    changed.write_bytes(b"<?php \r\nreturn true;\t")
+    workspace._git = Mock(
+        side_effect=[
+            subprocess.CompletedProcess([], 0, "", ""),
+            subprocess.CompletedProcess([], 0, "new.php\n", ""),
+        ]
+    )
+
+    normalized = workspace.normalize_changed_whitespace(
+        ChangeSummary(("new.php",), 2, 0)
+    )
+
+    assert normalized == ("new.php",)
+    assert changed.read_bytes() == b"<?php\r\nreturn true;"
+
+
+def test_normalize_changed_whitespace_only_cleans_reported_tracked_lines(
+    settings,
+    tmp_path: Path,
+) -> None:
+    workspace = GitWorkspace(replace(settings, workspace_root=tmp_path), 1)
+    workspace.path.mkdir(parents=True)
+    changed = workspace.path / "tracked.php"
+    changed.write_bytes(b"<?php \nlegacy whitespace \n")
+    workspace._git = Mock(
+        side_effect=[
+            subprocess.CalledProcessError(
+                2,
+                ["git", "diff", "--check"],
+                output="tracked.php:1: trailing whitespace.\n",
+                stderr="",
+            ),
+            subprocess.CompletedProcess([], 0, "", ""),
+        ]
+    )
+
+    normalized = workspace.normalize_changed_whitespace(
+        ChangeSummary(("tracked.php",), 1, 1)
+    )
+
+    assert normalized == ("tracked.php",)
+    assert changed.read_bytes() == b"<?php\nlegacy whitespace \n"
+
+
 def test_check_diff_accepts_clean_changed_file(settings, tmp_path: Path) -> None:
     workspace = GitWorkspace(replace(settings, workspace_root=tmp_path), 1)
     workspace.path.mkdir(parents=True)