Fix bug in PNG command and expand integration test

lib/pg-verify/cli/cli.rb

@@ -42,8 +42,7 @@ def png()
                     components = self.class.select_components(options[:only], options[:hide], model)
                     puml = Transform::PumlTransformation.new(render_labels: !hide_labels).transform_graph(model, only: components)
                     png = PlantumlBuilder::Formats::PNG.new(puml).load
-                    out_name = File.basename(script_file, '.*')
-                    out_name += "-" + model.name.to_s.gsub(/\W+/, '_').downcase + ".png"
+                    out_name = model.name.to_s.gsub(/\W+/, '_').downcase + ".png"
                     out_path = File.expand_path(out_name, Settings.outdir)
                     FileUtils.mkdir_p(Settings.outdir)
                     File.binwrite(out_path, png)

lib/pg-verify/cli/cli_utils.rb

@@ -27,7 +27,7 @@ def self.load_models(options)
             end
 
             raise NoDefaultFileError.new(default_script_file) unless File.file?(default_script_file)
-            return Interpret::PgScript.new.interpret(dsl_script_file)
+            return Interpret::PgScript.new.interpret(default_script_file)
         end
 
     end

lib/pg-verify/interpret/pg_script.rb

@@ -15,6 +15,7 @@ def initialize()
             end
 
             def interpret(file, validate: true)
+                raise "Not a file path string: '#{file}'::#{file.class}" unless file.is_a?(String)
                 file = File.expand_path(file)
                 raise NoSuchScriptError.new(file) unless File.file?(file)
                 @script_file ||= file

vscript.rb

@@ -51,7 +51,7 @@
             "script" => source,
             "json-file" => File.join(work_dir, File.basename(source, '.rb') + ".json"),
         }
-        commands = [ "show puml", "test", "dcca" ]
+        commands = [ "show puml", "test", "dcca", "show png", "simulate" ]
         args.each { |argument, file|
             commands.each { |command|
                 log "pgv #{command} #{argument} | #{File.basename(file)}"