diff tests/test-simplekeyvaluefile.py @ 32270:218ca8526ec0

scmutil: make simplekeyvaluefile able to have a non-key-value first line

To ease migration from files with version numbers in their first lines,
we want simplekeyvaluefile to support a non-key-value first line. In this
way, old versions of Mercurial will read such files, discover a newer version
than the one they know how to handle and fail gracefully, rather than with
exception. Shelve's shelvestate file is an example.

--- a/tests/test-simplekeyvaluefile.py	Thu May 11 08:39:44 2017 -0700
+++ b/tests/test-simplekeyvaluefile.py	Thu May 11 08:49:33 2017 -0700
@@ -72,5 +72,13 @@
         self.assertRaises(error.CorruptedState,
                           scmutil.simplekeyvaluefile(self.vfs, 'badfile').read)
 
+    def testfirstline(self):
+        dw = {'key1': 'value1'}
+        scmutil.simplekeyvaluefile(self.vfs, 'fl').write(dw, firstline='1.0')
+        self.assertEqual(self.vfs.read('fl'), '1.0\nkey1=value1\n')
+        dr = scmutil.simplekeyvaluefile(self.vfs, 'fl')\
+                    .read(firstlinenonkeyval=True)
+        self.assertEqual(dr, {'__firstline': '1.0', 'key1': 'value1'})
+
 if __name__ == "__main__":
     silenttestrunner.main(__name__)