1 files changed, 51 insertions, 0 deletions
diff --git a/tests/serialize/errors.test.py b/tests/serialize/errors.test.py
new file mode 100644
index 0000000..ff6371f
--- /dev/null
+++ b/tests/serialize/errors.test.py
@@ -0,0 +1,51 @@
+"""Errors raised by the canonical (de)serializer through the public Pattern API."""
+
+import json
+
+import pytest
+
+from edify import Pattern
+from edify.errors.serialize import (
+    IncompatibleSchemaVersionError,
+    MissingSchemaKeyError,
+    UnknownElementKindError,
+)
+
+
+def test_missing_edify_key_raises():
+    with pytest.raises(MissingSchemaKeyError):
+        Pattern.from_dict({"pattern": {"kind": "root", "children": []}})
+
+
+def test_missing_pattern_key_raises():
+    with pytest.raises(MissingSchemaKeyError):
+        Pattern.from_dict({"edify": 0})
+
+
+def test_missing_kind_on_nested_node_raises():
+    document = {
+        "edify": 0,
+        "pattern": {"kind": "root", "children": [{"value": "x"}]},
+    }
+    with pytest.raises(MissingSchemaKeyError):
+        Pattern.from_dict(document)
+
+
+def test_incompatible_schema_version_raises():
+    document = {"edify": 999, "pattern": {"kind": "root", "children": []}}
+    with pytest.raises(IncompatibleSchemaVersionError):
+        Pattern.from_dict(document)
+
+
+def test_unknown_kind_raises():
+    document = {
+        "edify": 0,
+        "pattern": {"kind": "root", "children": [{"kind": "mystery"}]},
+    }
+    with pytest.raises(UnknownElementKindError):
+        Pattern.from_dict(document)
+
+
+def test_bad_json_string_raises_decode_error():
+    with pytest.raises(json.JSONDecodeError):
+        Pattern.from_json("{not-valid-json}")