Adds comment signature unit testing

tests/unit/comments/test_comment_signing.py

@@ -0,0 +1,33 @@
+from torba.testcase import AsyncioTestCase
+
+from lbrynet.extras.daemon.comment_client import sign_comment
+from lbrynet.extras.daemon.comment_client import is_comment_signed_by_channel
+
+from tests.unit.wallet.test_schema_signing import get_stream, get_channel
+
+
+class TestSigningComments(AsyncioTestCase):
+
+    @staticmethod
+    def create_claim_comment_body(comment, claim, channel):
+        return {
+            'claim_id': claim.claim_id,
+            'channel_name': channel.claim_name,
+            'channel_id': channel.claim_id,
+            'comment': comment
+        }
+
+    def test01_successful_create_sign_and_validate_comment(self):
+        channel = get_channel('@BusterBluth')
+        stream = get_stream('pop secret')
+        comment = self.create_claim_comment_body('Cool stream', stream, channel)
+        sign_comment(comment, channel)
+        self.assertTrue(is_comment_signed_by_channel(comment, channel))
+
+    def test02_fail_to_validate_spoofed_channel(self):
+        pdiddy = get_channel('@PDitty')
+        channel2 = get_channel('@TomHaverford')
+        stream = get_stream()
+        comment = self.create_claim_comment_body('Woahh This is Sick!! Shout out 2 my boy Tommy H', stream, pdiddy)
+        sign_comment(comment, channel2)
+        self.assertFalse(is_comment_signed_by_channel(comment, pdiddy))