From 76a2f2128bec048bd3d77259585ffbcb56572d10 Mon Sep 17 00:00:00 2001
From: Ben Wiederhake <BenWiederhake.GitHub@gmx.de>
Date: Fri, 29 Mar 2024 00:50:33 +0100
Subject: [PATCH 1/2] tr: guard against regressions of class [:space:]

---
 tests/by-util/test_tr.rs | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/tests/by-util/test_tr.rs b/tests/by-util/test_tr.rs
index 6adbc4022..c2f69014a 100644
--- a/tests/by-util/test_tr.rs
+++ b/tests/by-util/test_tr.rs
@@ -1283,3 +1283,19 @@ fn test_complement_flag_fails_with_more_than_two_operand() {
         .fails()
         .stderr_contains("extra operand 'c'");
 }
+
+#[test]
+fn check_regression_class_space() {
+    // This invocation checks:
+    // 1. that the [:space:] class has exactly 6 characters,
+    // 2. that the [:space:] class contains at least the given 6 characters (and therefore no other characters), and
+    // 3. that the given characters occur in exactly this order.
+    new_ucmd!()
+        .args(&["[:space:][:upper:]", "123456[:lower:]"])
+        // 0x0B = "\v" ("VERTICAL TAB")
+        // 0x0C = "\f" ("FEED FORWARD")
+        .pipe_in("A\t\n\u{0B}\u{0C}\r B")
+        .succeeds()
+        .no_stderr()
+        .stdout_only("a123456b");
+}

From e9045be593b2b4ab9559993d0233e283be78ef92 Mon Sep 17 00:00:00 2001
From: Ben Wiederhake <BenWiederhake.GitHub@gmx.de>
Date: Fri, 29 Mar 2024 00:55:34 +0100
Subject: [PATCH 2/2] tr: fix order inside class [:blank:]

---
 src/uu/tr/src/unicode_table.rs |  2 +-
 tests/by-util/test_tr.rs       | 14 ++++++++++++++
 2 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/src/uu/tr/src/unicode_table.rs b/src/uu/tr/src/unicode_table.rs
index 5d31ab375..06687c392 100644
--- a/src/uu/tr/src/unicode_table.rs
+++ b/src/uu/tr/src/unicode_table.rs
@@ -12,4 +12,4 @@ pub static FF: u8 = 0xC;
 pub static CR: u8 = 0xD;
 pub static SPACE: u8 = 0x20;
 pub static SPACES: &[u8] = &[HT, LF, VT, FF, CR, SPACE];
-pub static BLANK: &[u8] = &[SPACE, HT];
+pub static BLANK: &[u8] = &[HT, SPACE];
diff --git a/tests/by-util/test_tr.rs b/tests/by-util/test_tr.rs
index c2f69014a..2502031b1 100644
--- a/tests/by-util/test_tr.rs
+++ b/tests/by-util/test_tr.rs
@@ -1299,3 +1299,17 @@ fn check_regression_class_space() {
         .no_stderr()
         .stdout_only("a123456b");
 }
+
+#[test]
+fn check_regression_class_blank() {
+    // This invocation checks:
+    // 1. that the [:blank:] class has exactly 2 characters,
+    // 2. that the [:blank:] class contains at least the given 2 characters (and therefore no other characters), and
+    // 3. that the given characters occur in exactly this order.
+    new_ucmd!()
+        .args(&["[:blank:][:upper:]", "12[:lower:]"])
+        .pipe_in("A\t B")
+        .succeeds()
+        .no_stderr()
+        .stdout_only("a12b");
+}