From 7bc8f2c8a167f4af77e293dd3392c19bec9f723b Mon Sep 17 00:00:00 2001
From: Mykhailo Chalyi <mike@chaliy.name>
Date: Tue, 7 Apr 2026 01:08:43 +0000
Subject: [PATCH] test(redirect): add append redirect spec tests
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Adds comprehensive tests for >> append behavior in compound commands,
brace groups, if/else, and rebuild cycle patterns. All tests pass —
the basic append mechanism is correct. If the issue reappears with a
specific reproduction, these tests provide a baseline.

Closes #1119
---
 .../spec_cases/bash/append_redirect.test.sh   | 74 +++++++++++++++++++
 1 file changed, 74 insertions(+)
 create mode 100644 crates/bashkit/tests/spec_cases/bash/append_redirect.test.sh

diff --git a/crates/bashkit/tests/spec_cases/bash/append_redirect.test.sh b/crates/bashkit/tests/spec_cases/bash/append_redirect.test.sh
new file mode 100644
index 00000000..5023c2dc
--- /dev/null
+++ b/crates/bashkit/tests/spec_cases/bash/append_redirect.test.sh
@@ -0,0 +1,74 @@
+# Append redirect tests
+# Tests that >> does not duplicate content in compound commands (issue #1119)
+
+### append_simple
+# Simple append works
+echo "line1" > /tmp/append.txt
+echo "line2" >> /tmp/append.txt
+cat /tmp/append.txt
+### expect
+line1
+line2
+### end
+
+### append_brace_group
+# Brace group append writes once
+rm -f /tmp/brace.txt
+{ echo "line1"; echo "line2"; } >> /tmp/brace.txt
+cat /tmp/brace.txt
+### expect
+line1
+line2
+### end
+
+### append_brace_group_existing_file
+# Brace group append to existing file
+echo "existing" > /tmp/exist.txt
+{ echo "new1"; echo "new2"; } >> /tmp/exist.txt
+cat /tmp/exist.txt
+### expect
+existing
+new1
+new2
+### end
+
+### append_no_duplicate
+# Repeated appends should not duplicate
+rm -f /tmp/nodup.txt
+echo "first" >> /tmp/nodup.txt
+echo "second" >> /tmp/nodup.txt
+cat /tmp/nodup.txt
+### expect
+first
+second
+### end
+
+### append_if_else
+# if/else with append redirect
+rm -f /tmp/ifelse.txt
+if false; then
+    echo "yes"
+else
+    echo "no"
+fi >> /tmp/ifelse.txt
+cat /tmp/ifelse.txt
+### expect
+no
+### end
+
+### append_rebuild_cycle
+# Simulate bashblog rebuild: create file, then append-only should not duplicate
+rm -f /tmp/footer.html
+{
+    echo "<div>footer line 1</div>"
+    echo "<div>footer line 2</div>"
+} >> /tmp/footer.html
+# Rebuild: run the same block again — should append, not duplicate first block
+{
+    echo "<div>footer line 1</div>"
+    echo "<div>footer line 2</div>"
+} >> /tmp/footer.html
+wc -l < /tmp/footer.html
+### expect
+4
+### end