support/testing/tests/package/test_screen.py: new runtime test

Signed-off-by: Julien Olivain <ju.o@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

DEVELOPERS

@@ -1768,6 +1768,7 @@ F:	support/testing/tests/package/test_python_pyalsa.py
 F:	support/testing/tests/package/test_python_spake2.py
 F:	support/testing/tests/package/test_rdma_core.py
 F:	support/testing/tests/package/test_rdma_core/
+F:	support/testing/tests/package/test_screen.py
 F:	support/testing/tests/package/test_stress_ng.py
 F:	support/testing/tests/package/test_weston.py
 F:	support/testing/tests/package/test_weston/

support/testing/tests/package/test_screen.py

@@ -0,0 +1,61 @@
+import os
+
+import infra.basetest
+
+
+class TestScreen(infra.basetest.BRTest):
+    config = infra.basetest.BASIC_TOOLCHAIN_CONFIG + \
+        """
+        BR2_PACKAGE_SCREEN=y
+        BR2_TARGET_ROOTFS_CPIO=y
+        # BR2_TARGET_ROOTFS_TAR is not set
+        """
+
+    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()
+
+        session_name = "BuildrootSession"
+        message = "HelloBuildroot"
+        screen_dump = "screen.dump.txt"
+
+        # Check the program can execute
+        self.assertRunOk("screen --version")
+
+        # There is no "screen" running yet. Listing sessions is
+        # expected to fail.
+        _, exit_code = self.emulator.run("screen -ls")
+        self.assertNotEqual(exit_code, 0)
+
+        # We now start a detached and named session.
+        self.assertRunOk(f"screen -dmS {session_name}")
+
+        # Since we are supposed to have a running session, it should
+        # appear in the list.
+        output, exit_code = self.emulator.run("screen -ls")
+        self.assertEqual(exit_code, 0)
+        self.assertIn(session_name, "\n".join(output))
+
+        # We send an exec command to print a message in the "screen"
+        # display running in background.
+        cmd = f"screen -S {session_name} -X exec printf {message}"
+        self.assertRunOk(cmd)
+
+        # We request a hardcopy of this "screen" display.
+        cmd = f"screen -S {session_name} -X hardcopy {screen_dump}"
+        self.assertRunOk(cmd)
+
+        # The dump file is supposed to contain our message.
+        self.assertRunOk(f"grep -Fo '{message}' {screen_dump}")
+
+        # We request "screen" to quit...
+        cmd = f"screen -S {session_name} -X quit"
+        self.assertRunOk(cmd)
+
+        # Since the session is supposed to be terminated, listing
+        # sessions is expected to fail (again).
+        _, exit_code = self.emulator.run("screen -ls")
+        self.assertNotEqual(exit_code, 0)