--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tests/test_diff.py	Wed Mar 08 17:04:58 2023 +0100
@@ -0,0 +1,47 @@
+from tests import common
+from hglib.util import b
+
+class test_diff(common.basetest):
+    def test_basic(self):
+        self.append('a', 'a\n')
+        self.client.add(b('a'))
+        diff1 = b("""diff -r 000000000000 a
+--- /dev/null
++++ b/a
+@@ -0,0 +1,1 @@
++a
+""")
+        self.assertEquals(diff1, self.client.diff(nodates=True))
+        self.assertEquals(diff1, self.client.diff([b('a')], nodates=True))
+        rev0, node0 = self.client.commit(b('first'))
+        diff2 = b("""diff -r 000000000000 -r """) + node0[:12] + b(""" a
+--- /dev/null
++++ b/a
+@@ -0,0 +1,1 @@
++a
+""")
+        self.assertEquals(diff2, self.client.diff(change=rev0, nodates=True))
+        self.append('a', 'a\n')
+        rev1, node1 = self.client.commit(b('second'))
+        diff3 = b("""diff -r """) + node0[:12] + b(""" a
+--- a/a
++++ b/a
+@@ -1,1 +1,2 @@
+ a
++a
+""")
+        self.assertEquals(diff3, self.client.diff(revs=[rev0], nodates=True))
+        diff4 = b("""diff -r """) + node0[:12] + b(" -r ") + node1[:12] + b(
+            """ a
+--- a/a
++++ b/a
+@@ -1,1 +1,2 @@
+ a
++a
+""")
+        self.assertEquals(diff4, self.client.diff(revs=[rev0, rev1],
+                                                  nodates=True))
+
+    def test_basic_plain(self):
+        open('.hg/hgrc', 'a').write('[defaults]\ndiff=--git\n')
+        self.test_basic()