tests: Add Ctrl-C interrupt tests for REPL and execution.

Tests paste mode Ctrl-C cancellation and Ctrl-C interruption during
code execution to validate terminal mode switching behavior.

Signed-off-by: Andrew Leech <[email protected]>

Author: pi-anl

pyproject.toml

@@ -34,6 +34,7 @@ exclude = [  # Ruff finds Python SyntaxError in these files
   "tests/cmdline/repl_autoindent.py",
   "tests/cmdline/repl_basic.py",
   "tests/cmdline/repl_cont.py",
+  "tests/cmdline/repl_ctrl_c_interrupt.py",
   "tests/cmdline/repl_emacs_keys.py",
   "tests/cmdline/repl_paste.py",
   "tests/cmdline/repl_words_move.py",

tests/cmdline/repl_ctrl_c_interrupt.py

@@ -0,0 +1,9 @@
+# Test that Ctrl-C interrupts running code
+
+# Test paste mode Ctrl-C cancel
+{\x05}
+print('paste mode')
+{\x03}
+
+# Verify REPL works
+print('REPL works')

tests/cmdline/repl_ctrl_c_interrupt.py.exp

@@ -0,0 +1,16 @@
+MicroPython \.\+ version
+Type "help()" for more information.
+>>> # Test that Ctrl-C interrupts running code
+>>> 
+>>> # Test paste mode Ctrl-C cancel
+>>> 
+paste mode; Ctrl-C to cancel, Ctrl-D to finish
+=== 
+=== print('paste mode')
+=== 
+>>> 
+>>> 
+>>> # Verify REPL works
+>>> print('REPL works')
+REPL works
+>>> 

tests/ports/unix/itest_ctrl_c_interrupt.py

@@ -0,0 +1,71 @@
+"""
+Test that Ctrl-C interrupts running code in the REPL.
+
+This test is run by run-tests.py which sets up a PTY with ISIG enabled
+and spawns MicroPython with the PTY as its controlling terminal.
+The global 'master' variable (PTY master fd) is provided by run-tests.py.
+"""
+
+import os
+import select
+import time
+
+
+def read_until_quiet(master, timeout=0.05):
+    """Read from PTY until no data for timeout seconds."""
+    output = b""
+    while True:
+        ready = select.select([master], [], [], timeout)
+        if ready[0]:
+            data = os.read(master, 1024)
+            if not data:
+                break
+            output += data
+        else:
+            break
+    return output
+
+
+# Wait for banner
+time.sleep(0.2)
+banner = read_until_quiet(master)
+
+if b"MicroPython" not in banner:
+    print("SKIP")
+    raise SystemExit
+
+# Check if time module is available
+os.write(master, b"import time\n")
+time.sleep(0.05)
+check_output = read_until_quiet(master, timeout=0.05)
+if b"ImportError" in check_output:
+    print("SKIP")
+    raise SystemExit
+
+# Start a long-running operation
+os.write(master, b"time.sleep(30)\n")
+time.sleep(0.1)  # Give it time to start sleeping
+
+# Send Ctrl-C byte (0x03) through the terminal
+# This tests that the terminal mode allows SIGINT generation
+os.write(master, b"\x03")
+
+# Read output
+time.sleep(0.2)
+output = read_until_quiet(master, timeout=0.1)
+
+# Check for KeyboardInterrupt
+if b"KeyboardInterrupt" in output:
+    print("PASS: Ctrl-C interrupted execution")
+else:
+    print("FAIL: No KeyboardInterrupt found")
+
+# Verify REPL still works
+os.write(master, b"print('OK')\n")
+time.sleep(0.1)
+output = read_until_quiet(master)
+
+if b"OK" in output:
+    print("PASS: REPL functional after interrupt")
+else:
+    print("FAIL: REPL not functional")

tests/ports/unix/itest_ctrl_c_interrupt.py.exp

@@ -0,0 +1,2 @@
+PASS: Ctrl-C interrupted execution
+PASS: REPL functional after interrupt