From 55af1282f3a2174f81f44714dfd14cf47387fe95 Mon Sep 17 00:00:00 2001
From: Julien Olivain <ju.o@free.fr>
Date: Sun, 21 Dec 2025 12:57:08 +0100
Subject: [PATCH] support/testing: add tio runtime test

Signed-off-by: Julien Olivain <ju.o@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit 7c8c8e01fa4ea1eb0fc1370e1e52f8dcec12e1f5)
Signed-off-by: Thomas Perale <thomas.perale@mind.be>
---
 DEVELOPERS                                |  1 +
 support/testing/tests/package/test_tio.py | 74 +++++++++++++++++++++++
 2 files changed, 75 insertions(+)
 create mode 100644 support/testing/tests/package/test_tio.py

diff --git a/DEVELOPERS b/DEVELOPERS
index 987900ab80..04f83701ad 100644
--- a/DEVELOPERS
+++ b/DEVELOPERS
@@ -1984,6 +1984,7 @@ F:	support/testing/tests/package/test_tcl.py
 F:	support/testing/tests/package/test_tcl/
 F:	support/testing/tests/package/test_tcpdump.py
 F:	support/testing/tests/package/test_tesseract_ocr.py
+F:	support/testing/tests/package/test_tio.py
 F:	support/testing/tests/package/test_trace_cmd.py
 F:	support/testing/tests/package/test_trace_cmd/
 F:	support/testing/tests/package/test_tree.py
diff --git a/support/testing/tests/package/test_tio.py b/support/testing/tests/package/test_tio.py
new file mode 100644
index 0000000000..f7d612b9dd
--- /dev/null
+++ b/support/testing/tests/package/test_tio.py
@@ -0,0 +1,74 @@
+import os
+import time
+
+import infra.basetest
+
+
+class TestTio(infra.basetest.BRTest):
+    config = infra.basetest.BASIC_TOOLCHAIN_CONFIG + \
+        """
+        BR2_PACKAGE_LUA=y
+        BR2_PACKAGE_SOCAT=y
+        BR2_PACKAGE_TIO=y
+        BR2_TARGET_ROOTFS_CPIO=y
+        # BR2_TARGET_ROOTFS_TAR is not set
+        """
+
+    def get_tty_name(self):
+        out, ret = self.emulator.run("tty")
+        self.assertEqual(ret, 0)
+        return out[0]
+
+    def test_run(self):
+        cpio_file = os.path.join(self.builddir, "images", "rootfs.cpio")
+        self.emulator.boot(arch="armv5",
+                           kernel="builtin",
+                           options=["-initrd", cpio_file])
+        self.emulator.login()
+
+        # We check the program can run
+        self.assertRunOk("tio --version")
+
+        # We save our tty name for later.
+        initial_tty = self.get_tty_name()
+
+        # We define two arbitrary pseudo-terminals, for our test.
+        pty1 = "pty1_getty"
+        pty2 = "pty2_tio"
+
+        # We create our 2 PTYs with socat and connect them together.
+        cmd = "( socat"
+        for pty in [pty1, pty2]:
+            cmd += f" PTY,link=/dev/{pty},rawer,b115200"
+        cmd += " &> /dev/null & )"
+        self.assertRunOk(cmd)
+
+        # We wait for socat to be ready...
+        for attempt in range(3 * self.timeout_multiplier):
+            time.sleep(1)
+            cmd = f"test -e /dev/{pty1} -a -e /dev/{pty2}"
+            _, ret = self.emulator.run(cmd)
+            if ret == 0:
+                break
+        else:
+            self.fail("Timeout while waiting for socat.")
+
+        # We start getty on our first PTY.
+        self.assertRunOk(f"setsid getty {pty1} 115200 vt100")
+
+        # We start tio on our second PTY and send a new line.
+        # We wait for tio to be ready then send a new line.
+        # After that, we expect to see a new login.
+        self.emulator.qemu.sendline(f"tio /dev/{pty2}")
+        self.emulator.qemu.expect(f"Connected to /dev/{pty2}")
+        self.emulator.qemu.sendline()
+
+        # We try to re-login, in tio this time.
+        self.emulator.login()
+
+        # We get again our tty name.
+        tio_tty = self.get_tty_name()
+
+        # We check our second login TTY name is different from the one
+        # in the first login.
+        self.assertNotEqual(initial_tty, tio_tty)