oeqa/selftest/devtool: add test for modifying recipes using go.bbclass

go.bbclass uses a special do_unpack function that causes the git root
to be different from S.  Verify that it unpacks as expected.

[ YOCTO #15483 ]

(From OE-Core rev: fab0c737b95b8d0c0bbf58336bc308776c956406)

Signed-off-by: Ola x Nilsson <olani@axis.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/lib/oeqa/selftest/cases/devtool.py

@@ -753,6 +753,25 @@ class DevtoolModifyTests(DevtoolBase):
         result = runCmd('devtool status')
         self.assertNotIn('mdadm', result.output)
 
+    def test_devtool_modify_go(self):
+        import oe.path
+        from tempfile import TemporaryDirectory
+        with TemporaryDirectory(prefix='devtoolqa') as tempdir:
+            self.track_for_cleanup(self.workspacedir)
+            self.add_command_to_tearDown('bitbake -c clean go-helloworld')
+            self.add_command_to_tearDown('bitbake-layers remove-layer */workspace')
+            result = runCmd('devtool modify go-helloworld -x %s' % tempdir)
+            self.assertExists(
+                oe.path.join(tempdir, 'src', 'golang.org', 'x', 'example', 'go.mod'),
+                             'Extracted source could not be found'
+            )
+            self.assertExists(
+                oe.path.join(self.workspacedir, 'conf', 'layer.conf'),
+                'Workspace directory not created'
+            )
+            matches = glob.glob(oe.path.join(self.workspacedir, 'appends', 'go-helloworld_*.bbappend'))
+            self.assertTrue(matches, 'bbappend not created %s' % result.output)
+
     def test_devtool_buildclean(self):
         def assertFile(path, *paths):
             f = os.path.join(path, *paths)