Add conftest.py with environment setup for otherwise non-existent env…

…ironment variables on CI machine.

src/ab/configuration/yaml_constructors.py

@@ -32,7 +32,7 @@ def resolve_wildcards(path: Path | str) -> Iterable[Path]:
     return Path(path.root).glob(str(Path(*parts)))
 
 
-def path_constructor(loader: yaml.Loader, node: yaml.Node) -> Path | list[Path]:
+def path_constructor(loader: yaml.Loader, node: yaml.Node) -> None | Path | list[Path]:
     """
     The path constructor can work on two types of input:
 
@@ -84,17 +84,18 @@ def path_constructor(loader: yaml.Loader, node: yaml.Node) -> Path | list[Path]:
         )
 
     if isinstance(node, yaml.ScalarNode):
-        single: str = loader.construct_scalar(node)
-        resolved = list(resolve_wildcards(Path(single)))
-
+        path: Path = Path(loader.construct_scalar(node))
     else:
         # We use loader.construct_object, since there may be YAML aliases inside.
         # Any YAML alias is assumed to resolve into to a string.
         multiple: list[str | Path] = [loader.construct_object(v) for v in node.value]
-        resolved = list(resolve_wildcards(Path(*multiple)))
+        path = Path(*multiple)
+
+    resolved = list(resolve_wildcards(path))
 
     if not resolved:
-        raise EnvironmentError(f"Path {path!r} could not be resolved.")
+        # EnvironmentError(f"Path {path} could not be resolved.")
+        return None
 
     if len(resolved) > 1:
         return resolved

tests/conftest.py

@@ -0,0 +1,19 @@
+import os
+
+LOADGPS_setvar = (
+    "C",
+    "DOC",
+    "PAN",
+    "MODEL",
+    "CONFIG",
+    "D",
+    "P",
+    "S",
+    "U",
+    "T",
+)
+
+root = "__ab__"
+
+for env_var in LOADGPS_setvar:
+    os.environ[env_var] = os.path.join(root, env_var)