diff --git a/src/pg_rad/main.py b/src/pg_rad/main.py
index 2929cbc..1d3100d 100644
--- a/src/pg_rad/main.py
+++ b/src/pg_rad/main.py
@@ -5,10 +5,17 @@ import sys
 from pandas.errors import ParserError
 from yaml import YAMLError
 
-from pg_rad.exceptions.exceptions import MissingNestedKeyError
+from pg_rad.exceptions.exceptions import (
+    MissingConfigKeyError,
+    OutOfBoundsError,
+    DimensionError,
+    InvalidIsotopeError
+)
 from pg_rad.logger.logger import setup_logger
+from pg_rad.inputparser.parser import ConfigParser
 from pg_rad.landscape.director import LandscapeDirector
-from pg_rad.plotting.landscape_plotter import LandscapeSlicePlotter
+from pg_rad.plotting.result_plotter import ResultPlotter
+from pg_rad.simulator.engine import SimulationEngine
 
 
 def main():
@@ -23,7 +30,7 @@ def main():
     parser.add_argument(
         "--test",
         action="store_true",
-        help="Load and run the test landscape"
+        help="Load and run the test landscape."
     )
     parser.add_argument(
         "--loglevel",
@@ -41,19 +48,52 @@ def main():
     logger = logging.getLogger(__name__)
 
     if args.test:
-        landscape = LandscapeDirector().build_test_landscape()
-        plotter = LandscapeSlicePlotter()
-        plotter.plot(landscape, save=args.saveplot)
+        test_yaml = """
+        name: Test landscape
+        speed: 8.33
+        acquisition_time: 1
+
+        path:
+            length: 1000
+            segments:
+                - straight
+
+        sources:
+            test_source:
+                activity_MBq: 1000
+                position: [500, 100, 0]
+                isotope: CS137
+        """
+
+        cp = ConfigParser(test_yaml).parse()
+        landscape = LandscapeDirector.build_from_config(cp)
+
+        output = SimulationEngine(
+            landscape=landscape,
+            runtime_spec=cp.runtime,
+            sim_spec=cp.options
+        ).simulate()
+
+        plotter = ResultPlotter(landscape, output)
+        plotter.plot()
 
     elif args.config:
         try:
-            landscape = LandscapeDirector.build_from_config(args.config)
-            plotter = LandscapeSlicePlotter()
-            plotter.plot(landscape, save=args.saveplot)
+            cp = ConfigParser(args.config).parse()
+            landscape = LandscapeDirector.build_from_config(cp)
+
+            output = SimulationEngine(
+                landscape=landscape,
+                runtime_spec=cp.runtime,
+                sim_spec=cp.options
+            ).simulate()
+
+            plotter = ResultPlotter(landscape, output)
+            plotter.plot()
         except (
-            MissingNestedKeyError,
+            MissingConfigKeyError,
             KeyError,
-            YAMLError
+            YAMLError,
         ):
             logger.critical(
                 "The provided config file is invalid. "
@@ -61,6 +101,18 @@ def main():
                 "an explanation of how to define a config file."
                 )
             sys.exit(1)
+        except (
+            OutOfBoundsError,
+            DimensionError,
+            InvalidIsotopeError
+        ) as e:
+            logger.critical(e)
+            logger.critical(
+                "One or more items in config are not specified correctly. "
+                "Please consult this log and fix the problem."
+                )
+            sys.exit(1)
+
         except (
             FileNotFoundError,
             ParserError