support/testing: add ed runtime test

Signed-off-by: Julien Olivain <ju.o@free.fr>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
(cherry picked from commit dc101babfd5fd36062b8c7551e41cace84192a70)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

DEVELOPERS

@@ -1771,6 +1771,7 @@ F:	support/testing/tests/package/test_cryptsetup/
 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_ed.py
 F:	support/testing/tests/package/test_file.py
 F:	support/testing/tests/package/test_file/
 F:	support/testing/tests/package/test_fluidsynth.py

support/testing/tests/package/test_ed.py

@@ -0,0 +1,98 @@
+import os
+
+import infra.basetest
+
+
+class TestEd(infra.basetest.BRTest):
+    config = infra.basetest.BASIC_TOOLCHAIN_CONFIG + \
+        """
+        BR2_PACKAGE_ED=y
+        BR2_TARGET_ROOTFS_CPIO=y
+        # BR2_TARGET_ROOTFS_TAR is not set
+        """
+
+    def run_ed_cmds(self, ed_cmds):
+        cmd = "ed <<EOF\n"
+        cmd += "\n".join(ed_cmds)
+        cmd += "\nEOF"
+        self.assertRunOk(cmd)
+
+    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. This also check we have the
+        # actual GNU ed, rather than the Busybox ed, which does not
+        # recognize the --version option.
+        self.assertRunOk("ed --version")
+
+        test_fname = "test.txt"
+        input_text_lines = [
+            "Hello World",
+            "Embedded Linux is Hard."
+        ]
+        output_expected_text = [
+            "Hello Buildroot",
+            "---------------",
+            "Making Embedded Linux Easy."
+        ]
+
+        # We define few "ed" command sequences, creating and editing a
+        # text file. The final output of this sequence is expected to
+        # match the expected text previously defined.
+        create_file = ["a"]
+        create_file += input_text_lines
+        create_file += [
+            ".",
+            f"w {test_fname}",
+            "q"
+        ]
+
+        edit_file = [
+            f"r {test_fname}",
+            "1",
+            "s/World/Buildroot/",
+            "2",
+            "s/is Hard/Easy/",
+            "s/^/Making /",
+            "w",
+            "q"
+        ]
+
+        insert_txt = [
+            f"r {test_fname}",
+            "2",
+            "i",
+            "This is a new line",
+            ".",
+            "w",
+            "q"
+        ]
+
+        change_txt = [
+            f"r {test_fname}",
+            "2",
+            "c",
+            "---------------",
+            ".",
+            "w"
+            "q"
+        ]
+
+        # We execute all "ed" command batches.
+        ed_cmd_batches = [
+            create_file,
+            edit_file,
+            insert_txt,
+            change_txt
+        ]
+        for ed_cmd_batch in ed_cmd_batches:
+            self.run_ed_cmds(ed_cmd_batch)
+
+        # The final test file should contain the expected text.
+        out, ret = self.emulator.run(f"cat {test_fname}")
+        self.assertEqual(ret, 0)
+        self.assertEqual(out, output_expected_text)