Add test with only final analysis

tests/test_chain_evaluator.py

@@ -68,5 +68,51 @@ def test_chain_evaluator():
     exploration.run()
 
 
+def test_chain_evaluator_only_final_analysis():
+    """Test a ChainEvaluator where only the final TemplateEvaluator has an
+    analysis function."""
+    # Define variables and objectives.
+    var1 = VaryingParameter('x0', -50., 5.)
+    var2 = VaryingParameter('x1', -5., 15.)
+    obj = Objective('f', minimize=False)
+
+    # Define variables and objectives.
+    gen = RandomSamplingGenerator(
+        varying_parameters=[var1, var2],
+        objectives=[obj]
+    )
+
+    # Create template evaluator.
+    ev1 = TemplateEvaluator(
+        sim_template=os.path.join(
+            os.path.abspath(os.path.dirname(__file__)),
+            'resources',
+            'template_simulation_script.py'
+        )
+    )
+    ev2 = TemplateEvaluator(
+        sim_template=os.path.join(
+            os.path.abspath(os.path.dirname(__file__)),
+            'resources',
+            'template_simulation_script_2.py'
+        ),
+        analysis_func=analysis_func_2
+    )
+    ev = ChainEvaluator([ev1, ev2])
+
+    # Create exploration.
+    exploration = Exploration(
+        generator=gen,
+        evaluator=ev,
+        max_evals=10,
+        sim_workers=2,
+        exploration_dir_path='./tests_output/test_chain_evaluator_2'
+    )
+
+    # Run exploration.
+    exploration.run()
+
+
 if __name__ == '__main__':
     test_chain_evaluator()
+    test_chain_evaluator_only_final_analysis()