improve logging. update test case for detector.

src/pg_rad/main.py

@@ -10,6 +10,7 @@ from pg_rad.exceptions.exceptions import (
     MissingConfigKeyError,
     OutOfBoundsError,
     DimensionError,
+    InvalidConfigValueError,
     InvalidIsotopeError
 )
 from pg_rad.logger.logger import setup_logger
@@ -64,15 +65,20 @@ def main():
                 activity_MBq: 1000
                 position: [500, 100, 0]
                 isotope: CS137
+
+        detector:
+            name: dummy
+            is_isotropic: True
         """
 
         cp = ConfigParser(test_yaml).parse()
         landscape = LandscapeDirector.build_from_config(cp)
-
+        detector = DetectorBuilder(cp.detector).build()
         output = SimulationEngine(
             landscape=landscape,
             runtime_spec=cp.runtime,
-            sim_spec=cp.options
+            sim_spec=cp.options,
+            detector=detector
         ).simulate()
 
         plotter = ResultPlotter(landscape, output)
@@ -96,18 +102,19 @@ def main():
             MissingConfigKeyError,
             KeyError,
             YAMLError,
-        ):
+        ) as e:
+            logger.critical(e)
             logger.critical(
-                "The provided config file is invalid. "
-                "Check the log above. You can consult the documentation for "
-                "an explanation of how to define a config file."
+                "The config file is missing required keys or may be an "
+                "invalid YAML file. Check the log above. Consult the "
+                "documentation for examples of how to write a config file."
                 )
             sys.exit(1)
         except (
             OutOfBoundsError,
             DimensionError,
             InvalidIsotopeError,
-            ValueError
+            InvalidConfigValueError
         ) as e:
             logger.critical(e)
             logger.critical(