Remove npc randomization from code

Assertations and Validation tests included to keep it out

project/story/demo_stories/year_bound_demo.gd

@@ -2,6 +2,8 @@ extends SimpleStory
 
 var text := "This story will not be shown during the player's freshman year."
 
+var npc_name := "Steven"
+
 var years := Year.not_year(Year.Name.FRESHMAN)
 
 var options := {

project/test/integration/simple_story_validity_test.gd

@@ -22,15 +22,20 @@ func test_stories_exist():
 	assert_true(story_paths.size() > 0, "No stories found in %s" % STORY_PATH)
 
 
+func test_story_has_npc():
+	_for_each_story(func(story,path):
+		assert_true("npc_name" in story, "Story %s has an npc" % path)
+	)
+
+
 func test_npc_is_in_cast():
 	var cast := Cast.new()
 	cast.load_cast(CAST_PATH)
-	
+
 	_for_each_story(func(story, path):
-		if "npc_name" in story:
-			var npc_name : String = story.npc_name
-			assert_true(cast.contains(npc_name), 
-				"Cast does not contain an NPC named '%s' in %s" % [story,path])
+		var npc_name : String = story.npc_name
+		assert_true(cast.contains(npc_name), 
+			"Cast does not contain an NPC named '%s' in %s" % [story,path])
 	)
 
 

project/world/simple_story.gd

@@ -8,17 +8,15 @@ const _ON_OPTION_SELECTED_NAME := "on_option_selected"
 func run(presenter) -> void:
 	assert("text" in self, "This story must have 'text'")
 	assert(get("text") is String or get("text") is Array, "The 'text' must be a string or an array")
+	assert("npc_name" in self, "This story must have 'npc_name'")
 	assert("options" in self, "This story must have 'options'")
 
 	# Clear any old text from the screen first
 	presenter.show_text("")
 
-	# If the npc is specified, load it, and if not, pick one at random.
-	var npc : Npc
-	if "npc_name" in self:
-		npc = presenter.world.cast.get_by_name(get("npc_name"))
-	else:
-		npc = presenter.world.cast.pick_random()
+	var npc : Npc = presenter.world.cast.get_by_name(get("npc_name"))
+
+	# If the location is specified, load it, and if not, pick one at random.
 	var location : Texture
 	if "location" in self:
 		location = presenter.world.game_map.get_by_name(get("location"))