--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tests/test_context.py	Wed Mar 08 17:04:58 2023 +0100
@@ -0,0 +1,95 @@
+import sys
+from tests import common
+from hglib.error import CommandError
+import hglib
+from hglib import context
+from hglib.util import b
+
+class test_context(common.basetest):
+    def test_non_existent(self):
+        self.assertRaises(ValueError, context.changectx, self.client, b('foo'))
+
+    def test_basic(self):
+        self.append('a', 'a')
+        self.append('b', 'b')
+        rev0, node0 = self.client.commit(b('first'), addremove=True)
+
+        self.append('c', 'c')
+        rev1, node1 = self.client.commit(b('second'), addremove=True)
+
+        self.assertRaises(KeyError, self.client.__getitem__, 'doesnotexist')
+
+        ctx = self.client[node0]
+
+        self.assertEquals(ctx.description(), b('first'))
+        self.assertEquals(str(ctx), node0[:12].decode('latin-1'))
+        self.assertEquals(ctx.node(), node0)
+        self.assertEquals(int(ctx), rev0)
+        self.assertEquals(ctx.rev(), rev0)
+        self.assertEquals(ctx.branch(), b('default'))
+
+        self.assertTrue(ctx)
+
+        self.assertTrue(b('a') in ctx and b('b') in ctx)
+        self.assertFalse(b('c') in ctx)
+        self.assertEquals(list(ctx), [b('a'), b('b')])
+        self.assertEquals(ctx.files(), [b('a'), b('b')])
+
+        self.assertEquals(ctx.modified(), [])
+        self.assertEquals(ctx.added(), [b('a'), b('b')])
+        self.assertEquals(ctx.removed(), [])
+        self.assertEquals(ctx.ignored(), [])
+        self.assertEquals(ctx.clean(), [])
+
+        man = {b('a') : b('047b75c6d7a3ef6a2243bd0e99f94f6ea6683597'),
+               b('b') : b('62452855512f5b81522aa3895892760bb8da9f3f')}
+        self.assertEquals(ctx.manifest(), man)
+
+        self.assertEquals([int(c) for c in ctx.parents()], [-1])
+        self.assertEquals(int(ctx.p1()), -1)
+        self.assertEquals(int(ctx.p2()), -1)
+
+        self.assertEquals([int(c) for c in ctx.children()], [1])
+        self.assertEquals([int(c) for c in ctx.descendants()], [0, 1])
+        self.assertEquals([int(c) for c in ctx.ancestors()], [0])
+
+        self.client.bookmark(b('bookmark'), inactive=True, rev=node0)
+        self.assertEquals(ctx.bookmarks(), [b('bookmark')])
+
+        self.client.tag(b('tag'), rev=node0)
+        # tags are read on construction
+        self.assertEquals(self.client[node0].tags(), [b('tag')])
+
+    def test_construction(self):
+        self.append('a', 'a')
+        rev0, node0 = self.client.commit(b('first'), addremove=True)
+        tip = self.client.tip()
+
+        # from client.revision
+        ctx = context.changectx(self.client, tip)
+        self.assertEquals(ctx.node(), tip.node)
+
+        # from revset
+        ctx = context.changectx(self.client, b('all()'))
+        self.assertEquals(ctx.node(), tip.node)
+
+    def test_in_keyword(self):
+        """
+        test the 'in' keyword using both revision numbers or changeset ids.
+        """
+        if sys.version_info < (2, 7):
+            return
+
+        self.append('a', 'a')
+        rev0, node0 = self.client.commit(b('first'), addremove=True)
+        self.append('a', 'a')
+        rev1, node1 = self.client.commit(b('second'))
+
+        self.assertIn(1, self.client)
+        hash_1 = self.client.log(0)[0][1]
+        self.assertIn(hash_1, self.client)
+        self.assertNotIn(2, self.client)
+        hash_2 = self.client.log(1)[0][1]
+        self.assertIn(hash_2, self.client)
+        hash_2 = b('deadbeef')
+        self.assertNotIn(hash_2, self.client)