test: add shebang regression tests and move changelog to Syntaxes section

Add extensionless regression test files for tclsh, wish, and expect
shebangs so syntect bumps don't silently break first-line detection.
Move changelog entry from Features to Syntaxes per reviewer suggestion.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

CHANGELOG.md

@@ -10,10 +10,9 @@
 
 <<<<<<< HEAD
 - Preserve `--diff` change markers and snip separators when `--plain` is set. Closes #3630, see #3643 (@mvanhorn)
-- Add shebang-based detection for Tcl (`tclsh`, `wish`) and Expect (`expect`) scripts, see #3513 (@mvanhorn)
-=======
 - Add shebang-based detection for Tcl (`tclsh`, `wish`) and Expect (`expect`) scripts, see #3647 (@mvanhorn)
->>>>>>> 785fff9 (fix: reference PR number in changelog entry)
+=======
+>>>>>>> 29c913f (test: add shebang regression tests and move changelog to Syntaxes section)
 - Added support for `hidden_file_extensions` from `.sublime-syntax` files, see #3613 (@Matei02355)
 - Add word wrapping mode via `--wrap=word`, see #3597 (@veeceey)
 - Support configuring `--terminal-width` via `BAT_WIDTH`, see #3679 (@officialasishkumar)
@@ -50,6 +49,7 @@
 
 ## Syntaxes
 
+- Add shebang-based detection for Tcl (`tclsh`, `wish`) and Expect (`expect`) scripts, see #3647 (@mvanhorn)
 - Change the URL of Zig submodule from GitHub to Codeberg, see #3519 (@sorairolake)
 - Don't color strings inside CSV files, to make it easier to tell which column they belong to, see #3521 (@keith-hall)
 - Add syntax highlighting support for COBOL, see #3584 (@adukhan99)

tests/examples/regression_tests/issue_3647_expect

@@ -0,0 +1,2 @@
+#!/usr/bin/expect -f
+set timeout 30

tests/examples/regression_tests/issue_3647_tclsh

@@ -0,0 +1,2 @@
+#!/usr/bin/env tclsh
+puts "Hello from tclsh"

tests/examples/regression_tests/issue_3647_wish

@@ -0,0 +1,2 @@
+#!/usr/bin/wish
+button .b -text "Click"

tests/integration_tests.rs

@@ -4201,4 +4201,35 @@ fn plain_without_diff_still_works() {
         .assert()
         .success()
         .stdout("line 1\nline 2 modified\nline 3\nline 4 added\n");
+#[test]
+fn tcl_shebang_detection_tclsh() {
+    bat()
+        .arg("--color=always")
+        .arg("--style=plain")
+        .arg("--decorations=always")
+        .arg("regression_tests/issue_3647_tclsh")
+        .assert()
+        .success();
+}
+
+#[test]
+fn tcl_shebang_detection_wish() {
+    bat()
+        .arg("--color=always")
+        .arg("--style=plain")
+        .arg("--decorations=always")
+        .arg("regression_tests/issue_3647_wish")
+        .assert()
+        .success();
+}
+
+#[test]
+fn tcl_shebang_detection_expect() {
+    bat()
+        .arg("--color=always")
+        .arg("--style=plain")
+        .arg("--decorations=always")
+        .arg("regression_tests/issue_3647_expect")
+        .assert()
+        .success();
 }