Add edit command testcase when irb_path does not exist

lib/irb/cmd/edit.rb

@@ -24,11 +24,9 @@ def transform_args(args)
       def execute(*args)
         path = args.first
 
-        if path.nil? && (irb_path = @irb_context.irb_path)
-          path = irb_path
-        end
-
-        if !File.exist?(path)
+        if path.nil?
+          path = @irb_context.irb_path
+        elsif !File.exist?(path)
           source =
             begin
               SourceFinder.new(@irb_context).find_source(path)
@@ -39,12 +37,14 @@ def execute(*args)
 
           if source&.file_exist? && !source.binary_file?
             path = source.file
-          else
-            puts "Can not find file: #{path}"
-            return
           end
         end
 
+        unless path && File.exist?(path)
+          puts "Can not find file: #{path}"
+          return
+        end
+
         if editor = (ENV['VISUAL'] || ENV['EDITOR'])
           puts "command: '#{editor}'"
           puts "   path: #{path}"

test/irb/test_cmd.rb

@@ -848,6 +848,16 @@ def test_edit_without_arg
       assert_match("command: ': code'", out)
     end
 
+    def test_edit_without_arg_and_non_existing_irb_path
+      out, err = execute_lines(
+        "edit",
+        irb_path: '/path/to/file.rb(irb)'
+      )
+
+      assert_empty err
+      assert_match(/Can not find file: \/path\/to\/file\.rb\(irb\)/, out)
+    end
+
     def test_edit_with_path
       out, err = execute_lines(
         "edit #{__FILE__}"