FIX: `min` setting should be greater than 0 for multiple type polls.

plugins/poll/lib/polls_validator.rb

@@ -92,10 +92,11 @@ module DiscoursePoll
 
     def valid_multiple_choice_settings?(poll)
       if poll["type"] == "multiple"
+        num_of_options = poll["options"].size
         min = (poll["min"].presence || 1).to_i
-        max = (poll["max"].presence || poll["options"].size).to_i
+        max = (poll["max"].presence || num_of_options).to_i
 
-        if min > max || max <= 0 || max > poll["options"].size || min >= poll["options"].size
+        if min > max || min <= 0 || max <= 0 || max > num_of_options || min >= num_of_options
           if poll["name"] == ::DiscoursePoll::DEFAULT_POLL_NAME
             @post.errors.add(:base, I18n.t("poll.default_poll_with_multiple_choices_has_invalid_parameters"))
           else

plugins/poll/spec/lib/polls_validator_spec.rb

@@ -193,7 +193,37 @@ describe ::DiscoursePoll::PollsValidator do
         )
       end
 
-      it "should ensure that min settings is smaller than the number of options" do
+      it "should ensure that min settings is not negative" do
+        raw = <<-RAW.strip_heredoc
+        [poll type=multiple min=-1]
+        * 1
+        * 2
+        [/poll]
+        RAW
+
+        expect(post.update_attributes(raw: raw)).to eq(false)
+
+        expect(post.errors[:base]).to include(
+          I18n.t("poll.default_poll_with_multiple_choices_has_invalid_parameters")
+        )
+      end
+
+      it "should ensure that min settings it not equal to zero" do
+        raw = <<-RAW.strip_heredoc
+        [poll type=multiple min=0]
+        * 1
+        * 2
+        [/poll]
+        RAW
+
+        expect(post.update_attributes(raw: raw)).to eq(false)
+
+        expect(post.errors[:base]).to include(
+          I18n.t("poll.default_poll_with_multiple_choices_has_invalid_parameters")
+        )
+      end
+
+      it "should ensure that min settings is not equal to the number of options" do
         raw = <<-RAW.strip_heredoc
         [poll type=multiple min=2]
         * 1
@@ -206,7 +236,9 @@ describe ::DiscoursePoll::PollsValidator do
         expect(post.errors[:base]).to include(
           I18n.t("poll.default_poll_with_multiple_choices_has_invalid_parameters")
         )
+      end
 
+      it "should ensure that min settings is not greater than the number of options" do
         raw = <<-RAW.strip_heredoc
         [poll type=multiple min=3]
         * 1