added test for reqs structuring

functionality/requirements.py

@@ -0,0 +1,43 @@
+"""
+This file contains functions and definitions used in pattern and recipe 
+requirements, and assessed by handlers and conductors.
+
+Author(s): David Marchant
+"""
+
+from typing import Any, Dict, List, Tuple, Union
+
+from core.correctness.validation import check_type
+
+REQUIREMENT_PYTHON = "python"
+REQ_PYTHON_MODULES = "modules"
+REQ_PYTHON_VERSION = "version"
+REQ_PYTHON_ENVIRONMENT = "environment"
+
+
+def create_requirement_dict(key:str, entires:Dict[str,Any]
+        )->Tuple[str,Dict[str,Any]]:
+    return key, entires
+
+def create_python_requirements(modules:Union[str,List[str]]="", 
+        version:str="", environment:str="")->Dict[str,Any]:
+    check_type(modules, str, alt_types=[List])
+    if not isinstance(modules, List):
+        modules = [modules]
+    for i, module in enumerate(modules):
+        check_type(module, str, hint="create_python_requirement.modules[i]")
+    check_type(version, str)
+    check_type(environment, str)
+    
+    python_reqs = {}
+
+    if modules != [""]:
+        python_reqs[REQ_PYTHON_MODULES] = modules
+
+    if version:
+        python_reqs[REQ_PYTHON_VERSION] = version
+    
+    if environment:
+        python_reqs[REQ_PYTHON_ENVIRONMENT] = environment
+
+    return create_requirement_dict(REQUIREMENT_PYTHON, python_reqs)