From 0f148c8bcf4aba6bb561d16358419fd337ffcbbc Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Thu, 2 Apr 2026 05:30:53 +0000
Subject: [PATCH 1/3] Initial plan


From d8bcd7c8f9ec6cad388e04c4e06c529f70b4d07a Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Thu, 2 Apr 2026 05:31:32 +0000
Subject: [PATCH 2/3] fix: convert CRLF to LF in test/test/box_string.cpp

Agent-Logs-Url: https://github.com/microsoft/cppwinrt/sessions/9b31d4ec-f1c5-4859-89a1-3249eb553c5c

Co-authored-by: DefaultRyan <26174284+DefaultRyan@users.noreply.github.com>
---
 test/test/box_string.cpp | 106 +++++++++++++++++++--------------------
 1 file changed, 53 insertions(+), 53 deletions(-)

diff --git a/test/test/box_string.cpp b/test/test/box_string.cpp
index efff92160..7294eeb79 100644
--- a/test/test/box_string.cpp
+++ b/test/test/box_string.cpp
@@ -1,53 +1,53 @@
-#include "pch.h"
-
-TEST_CASE("box_string")
-{
-    // hstring
-    {
-        winrt::hstring value = L"hstring";
-        auto boxed = winrt::box_value(value);
-        REQUIRE(winrt::unbox_value<winrt::hstring>(boxed) == L"hstring");
-    }
-
-    // wchar_t const* (string literal)
-    {
-        auto boxed = winrt::box_value(L"literal");
-        REQUIRE(winrt::unbox_value<winrt::hstring>(boxed) == L"literal");
-    }
-
-    // std::wstring
-    {
-        std::wstring value = L"wstring";
-        auto boxed = winrt::box_value(value);
-        REQUIRE(winrt::unbox_value<winrt::hstring>(boxed) == L"wstring");
-    }
-
-    // std::wstring_view (null-terminated)
-    {
-        std::wstring_view value = L"view";
-        auto boxed = winrt::box_value(value);
-        REQUIRE(winrt::unbox_value<winrt::hstring>(boxed) == L"view");
-    }
-
-    // std::wstring_view (not null-terminated)
-    // Regression test for https://github.com/microsoft/cppwinrt/issues/1527
-    {
-        std::wstring source = L"ABCDE";
-        std::wstring_view value(source.data(), 3); // "ABC"
-        auto boxed = winrt::box_value(value);
-        REQUIRE(winrt::unbox_value<winrt::hstring>(boxed) == L"ABC");
-    }
-
-    // Empty string
-    {
-        auto boxed = winrt::box_value(winrt::hstring{});
-        REQUIRE(winrt::unbox_value<winrt::hstring>(boxed) == L"");
-    }
-
-    // Empty wstring_view
-    {
-        std::wstring_view value;
-        auto boxed = winrt::box_value(value);
-        REQUIRE(winrt::unbox_value<winrt::hstring>(boxed) == L"");
-    }
-}
+#include "pch.h"
+
+TEST_CASE("box_string")
+{
+    // hstring
+    {
+        winrt::hstring value = L"hstring";
+        auto boxed = winrt::box_value(value);
+        REQUIRE(winrt::unbox_value<winrt::hstring>(boxed) == L"hstring");
+    }
+
+    // wchar_t const* (string literal)
+    {
+        auto boxed = winrt::box_value(L"literal");
+        REQUIRE(winrt::unbox_value<winrt::hstring>(boxed) == L"literal");
+    }
+
+    // std::wstring
+    {
+        std::wstring value = L"wstring";
+        auto boxed = winrt::box_value(value);
+        REQUIRE(winrt::unbox_value<winrt::hstring>(boxed) == L"wstring");
+    }
+
+    // std::wstring_view (null-terminated)
+    {
+        std::wstring_view value = L"view";
+        auto boxed = winrt::box_value(value);
+        REQUIRE(winrt::unbox_value<winrt::hstring>(boxed) == L"view");
+    }
+
+    // std::wstring_view (not null-terminated)
+    // Regression test for https://github.com/microsoft/cppwinrt/issues/1527
+    {
+        std::wstring source = L"ABCDE";
+        std::wstring_view value(source.data(), 3); // "ABC"
+        auto boxed = winrt::box_value(value);
+        REQUIRE(winrt::unbox_value<winrt::hstring>(boxed) == L"ABC");
+    }
+
+    // Empty string
+    {
+        auto boxed = winrt::box_value(winrt::hstring{});
+        REQUIRE(winrt::unbox_value<winrt::hstring>(boxed) == L"");
+    }
+
+    // Empty wstring_view
+    {
+        std::wstring_view value;
+        auto boxed = winrt::box_value(value);
+        REQUIRE(winrt::unbox_value<winrt::hstring>(boxed) == L"");
+    }
+}

From cd81d46b1d77d904017bc860435a83537bc154ec Mon Sep 17 00:00:00 2001
From: Ryan Shepherd <ryansh@microsoft.com>
Date: Wed, 1 Apr 2026 23:34:02 -0700
Subject: [PATCH 3/3] Add workflow to check line endings in pull requests

---
 .github/workflows/check-line-endings.yml | 32 ++++++++++++++++++++++++
 1 file changed, 32 insertions(+)
 create mode 100644 .github/workflows/check-line-endings.yml

diff --git a/.github/workflows/check-line-endings.yml b/.github/workflows/check-line-endings.yml
new file mode 100644
index 000000000..a0705cf58
--- /dev/null
+++ b/.github/workflows/check-line-endings.yml
@@ -0,0 +1,32 @@
+name: Check Line Endings
+
+on:
+  pull_request:
+  push:
+    branches:
+      - master
+
+jobs:
+  check-line-endings:
+    name: Enforce .gitattributes line endings
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+
+      - name: Check for line ending violations
+        run: |
+          # Re-normalize all files according to .gitattributes
+          git add --renormalize .
+
+          # Check if renormalization changed anything
+          if git diff --cached --name-only | grep -q .; then
+            echo "::error::The following files have line endings that don't match .gitattributes settings:"
+            git diff --cached --name-only
+            echo ""
+            echo "To fix, run:"
+            echo "  git add --renormalize ."
+            echo "  git commit -m 'Normalize line endings'"
+            exit 1
+          fi
+
+          echo "All files have correct line endings."