support/testing/tests/package/test_dos2unix.py: new runtime test

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

DEVELOPERS

@@ -1729,6 +1729,7 @@ F:	support/testing/tests/package/sample_python_pyalsa.py
 F:	support/testing/tests/package/sample_python_spake2.py
 F:	support/testing/tests/package/test_ddrescue.py
 F:	support/testing/tests/package/test_ddrescue/
+F:	support/testing/tests/package/test_dos2unix.py
 F:	support/testing/tests/package/test_gnupg2.py
 F:	support/testing/tests/package/test_highway.py
 F:	support/testing/tests/package/test_hwloc.py

support/testing/tests/package/test_dos2unix.py

@@ -0,0 +1,45 @@
+import os
+
+import infra.basetest
+
+
+class TestDos2Unix(infra.basetest.BRTest):
+    config = infra.basetest.BASIC_TOOLCHAIN_CONFIG + \
+        """
+        BR2_PACKAGE_BUSYBOX_SHOW_OTHERS=y
+        BR2_PACKAGE_DOS2UNIX=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()
+
+        # Check the program can run. This test also checks that we're
+        # using the real "dos2unix" rather than the applet provided in
+        # BusyBox, since the "--version" option is recognized by the
+        # real dos2unix and return an error in BusyBox.
+        self.assertRunOk("dos2unix --version")
+
+        # Create a text file with UNIX new-lines
+        self.assertRunOk("echo -e 'Hello\\nBuildroot' > original.txt")
+
+        # Convert the original UNIX file to DOS
+        self.assertRunOk("unix2dos -n original.txt dos.txt")
+
+        # DOS file is expected to be different than the UNIX file
+        _, exit_code = self.emulator.run("cmp original.txt dos.txt")
+        self.assertNotEqual(exit_code, 0)
+
+        # The "cat -A" command should print '^M$' for CR-LF
+        self.assertRunOk("cat -A dos.txt | grep -Fq '^M$'")
+
+        # Convert back DOS file to UNIX
+        self.assertRunOk("dos2unix -n dos.txt unix.txt")
+
+        # "unix.txt" should be identical to "original.txt"
+        self.assertRunOk("cmp original.txt unix.txt")