From 36e2741a1ee094e4d9bf6bd5ff6dc9ef377145e7 Mon Sep 17 00:00:00 2001
From: Nate Cook <natecook@apple.com>
Date: Mon, 3 Apr 2023 13:59:43 -0500
Subject: [PATCH] Test for \s matching CRLF when scalar matching

In scalar matching mode, \s and \v both only match one of the CR/LF
pair.
---
 Tests/RegexTests/UTS18Tests.swift | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Tests/RegexTests/UTS18Tests.swift b/Tests/RegexTests/UTS18Tests.swift
index 4cf68a153..ae7aa2aa0 100644
--- a/Tests/RegexTests/UTS18Tests.swift
+++ b/Tests/RegexTests/UTS18Tests.swift
@@ -286,6 +286,9 @@ extension UTS18Tests {
     // Test \v - vertical space
     lines = lineInput.matches(of: regex(#"\d{2}\v^"#).anchorsMatchLineEndings())
     XCTAssertEqual(lines.count, 11)
+    // Test \s - whitespace
+    lines = lineInput.matches(of: regex(#"\d{2}\s^"#).anchorsMatchLineEndings())
+    XCTAssertEqual(lines.count, 11)
     // Test anchors as line boundaries
     lines = lineInput.matches(of: regex(#"^\d{2}$"#).anchorsMatchLineEndings())
     XCTAssertEqual(lines.count, 12)
@@ -301,6 +304,10 @@ extension UTS18Tests {
     lines = lineInput.matches(
       of: regex(#"\d{2}\v(?=\d)"#).matchingSemantics(.unicodeScalar).anchorsMatchLineEndings())
     XCTAssertEqual(lines.count, 10)
+    // Unicode scalar semantics - \s matches all except for \r\n sequence
+    lines = lineInput.matches(
+      of: regex(#"\d{2}\s(?=\d)"#).matchingSemantics(.unicodeScalar).anchorsMatchLineEndings())
+    XCTAssertEqual(lines.count, 10)
 
     // Does not contain an empty line
     XCTAssertFalse(lineInput.contains(regex(#"^$"#)))