From 93425676efc3653c69ddc5dfc7ed81f3966a1b89 Mon Sep 17 00:00:00 2001
From: Ryan Lopopolo <rjl@hyperbo.la>
Date: Sat, 1 Apr 2023 17:54:11 -0700
Subject: [PATCH] Add tests for boundary conditions when computing ISO week
 number

These tests currently fail. These tests were pulled from the following PR in
chrono:

- https://github.com/chronotope/chrono/pull/966

They were validated with MRI v3.1.2. The third test case differs between
chrono and MRI.
---
 src/tests/format.rs | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

diff --git a/src/tests/format.rs b/src/tests/format.rs
index 27cbce3..9bad29a 100644
--- a/src/tests/format.rs
+++ b/src/tests/format.rs
@@ -922,3 +922,34 @@ fn test_format_copies_non_specifier_bytes() {
         ],
     );
 }
+
+#[test]
+fn test_chrono_pr_966_week_numbers() {
+    let times = [
+        MockTime::new(2020, 1, 12, 0, 0, 0, 0, 4, 1, 0, false, 0, ""),
+        MockTime::new(2019, 1, 13, 0, 0, 0, 0, 4, 1, 0, false, 0, ""),
+        MockTime::new(2007, 12, 31, 0, 0, 0, 0, 4, 1, 0, false, 0, ""),
+    ];
+
+    check_all(
+        &times,
+        "%Y-%W-%w",
+        &[
+            // ```
+            // [3.1.2] > Time.utc(2020, 1, 12).strftime("%Y-%W-%w")
+            // => "2020-01-0"
+            // ```
+            "2020-01-0",
+            // ```
+            // [3.1.2] > Time.utc(2019, 1, 13).strftime("%Y-%W-%w")
+            // => "2019-01-0"
+            // ```
+            "2019-01-0",
+            // ```
+            // [3.1.2] > Time.utc(2007, 12, 31).strftime("%Y-%W-%w")
+            // => "2007-53-1"
+            // ```
+            "2007-12-52",
+        ],
+    );
+}