datasette.sign() and datasette.unsign() methods, refs #785

tests/test_cli.py

@@ -75,6 +75,7 @@ def test_metadata_yaml():
         static=[],
         memory=False,
         config=[],
+        secret=None,
         version_note=None,
         help_config=False,
         return_instance=True,

tests/test_internals_datasette.py

@@ -1,6 +1,7 @@
 """
 Tests for the datasette.app.Datasette class
 """
+from itsdangerous import BadSignature
 from .fixtures import app_client
 import pytest
 
@@ -21,3 +22,14 @@ def test_get_database_no_argument(datasette):
     # Returns the first available database:
     db = datasette.get_database()
     assert "fixtures" == db.name
+
+
+@pytest.mark.parametrize("value", ["hello", 123, {"key": "value"}])
+@pytest.mark.parametrize("namespace", [None, "two"])
+def test_sign_unsign(datasette, value, namespace):
+    extra_args = [namespace] if namespace else []
+    signed = datasette.sign(value, *extra_args)
+    assert value != signed
+    assert value == datasette.unsign(signed, *extra_args)
+    with pytest.raises(BadSignature):
+        datasette.unsign(signed[:-1] + ("!" if signed[-1] != "!" else ":"))