testcase class that shows a bug in the string representation of blocks

sets_testcase.py

@@ -0,0 +1,82 @@
+import unittest
+import pytest
+from biscuit_auth import Biscuit, KeyPair, BlockBuilder, BiscuitBuilder, ThirdPartyBlock, AuthorizerBuilder, Rule, \
+    Authorizer
+
+
+class SetTestCase(unittest.TestCase):
+    @classmethod
+    def setUpClass(cls):
+        # generate auth keypair
+        keypair = KeyPair()
+        cls.private_auth_key = keypair.private_key
+        cls.public_auth_key = keypair.public_key
+
+        # some test data
+        cls.arms = [ '1', '2', '3', '4', '5']
+        cls.legs = [ '1', '2', '3', '4', '5']
+        cls.heads = [ '1', '2', '3', '4', '5']
+
+        # test state by exploiting mutable default bug :)
+        cls.state = {}
+        cls.block_keys = []
+
+    def test_00_create_authority(self):
+        biscuit = BiscuitBuilder("""
+            arms({arms});
+            legs({legs});
+            heads({heads});
+        """, {
+            'arms' : self.arms,
+            'legs' : self.legs,
+            'heads' : self.heads,
+        })
+        self.state['block_count'] = 5
+        self.state['biscuit'] = biscuit.build(self.private_auth_key)
+        self.assertIsInstance(self.state['biscuit'] , Biscuit)
+
+    def test_01_add_blocks(self):
+        for block_id in range(1,self.state['block_count']):
+            biscuit = self.state['biscuit']
+            block_keypair = KeyPair()
+            self.block_keys.append(block_keypair)
+
+            request = biscuit.third_party_request()
+
+            block_contents = BlockBuilder("""
+                limb_id({limb_id});
+
+                check if arms($arms), limb_id($limb_id), $arms.contains($limb_id);
+                check if legs($legs), limb_id($limb_id), $legs.contains($limb_id);
+                check if heads($heads), limb_id($limb_id), $heads.contains($limb_id);
+                """, {
+                    'limb_id' : str(block_id),
+                })
+            self.assertIsInstance(block_contents, BlockBuilder)
+
+            block = request.create_block(block_keypair.private_key, block_contents)
+            self.assertIsInstance(block, ThirdPartyBlock)
+
+            self.state['biscuit']  = biscuit.append_third_party(block_keypair.public_key, block)
+            self.assertIsInstance(self.state['biscuit'] , Biscuit)
+
+        print(f"\n\nBiscuit Created : {self.state['biscuit'] }")
+
+    def test_02_create_authorizer(self):
+        source = ""
+        biscuit = self.state['biscuit']
+        print()
+        print("Blockcount: ", self.state['block_count'])
+        print("Block_keys: ", self.block_keys)
+
+        for block_id in range(1,self.state['block_count']):
+            pubkey = self.block_keys[block_id - 1].public_key
+            source += f'allow if limb_id("{block_id}") trusting {pubkey};'
+
+        authorizer_builder = AuthorizerBuilder(source, parameters={'limb_id':2})
+        self.assertIsInstance(authorizer_builder, AuthorizerBuilder)
+        authorizer = authorizer_builder.build(biscuit)
+        print(f"Authorizer Created : {authorizer}")
+        result = authorizer.authorize()
+        self.assertGreaterEqual(result, 0)
+        self.state['authorizer'] = authorizer