Add category check.

Author: CalebRas

Scripts/CI/common.py

@@ -377,6 +377,19 @@ def flush_to_json_string(self) -> str:
 
         return json.dumps(data, indent=4, sort_keys=True)
 
+    def check_category(self) -> None:
+        """
+        Check if
+        1. metadata contains a category.
+        2. category is valid.
+        
+        :return: None. Throws if exception occurs.
+        """
+        if not self.category:
+            raise Exception(f'Error category - Missing category.')
+        elif self.category not in categories:
+            raise Exception(f'Error category - Invalid category - "{self.category}".')
+
 
 class Readme:
     essential_headers = {

Scripts/CI/metadata_checker.py

@@ -78,6 +78,12 @@ def run_check(path: str) -> None:
         diff = '\n'.join(unified_diff(expected, actual))
         raise Exception(f'Error inconsistent metadata - {path} - {diff}')
 
+    # 4. Check category.
+    try:
+        checker.check_category()
+    except Exception as err:
+        raise Exception(f'{checker.folder_path} - {err}')
+
 
 def all_samples(path: str):
     """