Added new exception [CI SKIP]

app/exceptions.py

@@ -34,3 +34,22 @@ class MissingKeyError(Exception):
         self.message = "Missing key(s): {}".format(", ".join(keys))
 
         super().__init__()
+
+
+class InvalidValueError(Exception):
+    """Thrown when a key contains an invalid value."""
+
+    def __init__(self, key: str, expected: str, actual: str):
+        """Create a new InvalidValueError given the arguments.
+
+        Args:
+            key: the key containing the invalid value
+            expected: name of the expected type
+            actual: name of the actual type
+        """
+        self.message = (
+            f"Invalid value for key {key}: expected {expected}, "
+            f"got {actual}"
+        )
+
+        super().__init__()

tests/test_skeleton.py

@@ -1,5 +1,5 @@
 """Tests wether the skeleton merge works."""
-from app.skeleton import merge_with_skeleton, MissingKeyError, InvalidKeyError
+from app.skeleton import merge_with_skeleton
 from app.exceptions import InvalidKeyError, MissingKeyError
 import pytest