Add jsonschema validation for config files.

lib/spack/external/jsonschema/tests/test_format.py

@@ -0,0 +1,63 @@
+"""
+Tests for the parts of jsonschema related to the :validator:`format` property.
+
+"""
+
+from jsonschema.tests.compat import mock, unittest
+
+from jsonschema import FormatError, ValidationError, FormatChecker
+from jsonschema.validators import Draft4Validator
+
+
+class TestFormatChecker(unittest.TestCase):
+    def setUp(self):
+        self.fn = mock.Mock()
+
+    def test_it_can_validate_no_formats(self):
+        checker = FormatChecker(formats=())
+        self.assertFalse(checker.checkers)
+
+    def test_it_raises_a_key_error_for_unknown_formats(self):
+        with self.assertRaises(KeyError):
+            FormatChecker(formats=["o noes"])
+
+    def test_it_can_register_cls_checkers(self):
+        with mock.patch.dict(FormatChecker.checkers, clear=True):
+            FormatChecker.cls_checks("new")(self.fn)
+            self.assertEqual(FormatChecker.checkers, {"new" : (self.fn, ())})
+
+    def test_it_can_register_checkers(self):
+        checker = FormatChecker()
+        checker.checks("new")(self.fn)
+        self.assertEqual(
+            checker.checkers,
+            dict(FormatChecker.checkers, new=(self.fn, ()))
+        )
+
+    def test_it_catches_registered_errors(self):
+        checker = FormatChecker()
+        cause = self.fn.side_effect = ValueError()
+
+        checker.checks("foo", raises=ValueError)(self.fn)
+
+        with self.assertRaises(FormatError) as cm:
+            checker.check("bar", "foo")
+
+        self.assertIs(cm.exception.cause, cause)
+        self.assertIs(cm.exception.__cause__, cause)
+
+        # Unregistered errors should not be caught
+        self.fn.side_effect = AttributeError
+        with self.assertRaises(AttributeError):
+            checker.check("bar", "foo")
+
+    def test_format_error_causes_become_validation_error_causes(self):
+        checker = FormatChecker()
+        checker.checks("foo", raises=ValueError)(self.fn)
+        cause = self.fn.side_effect = ValueError()
+        validator = Draft4Validator({"format" : "foo"}, format_checker=checker)
+
+        with self.assertRaises(ValidationError) as cm:
+            validator.validate("bar")
+
+        self.assertIs(cm.exception.__cause__, cause)