add validations for config

lib/graphql/anycable/config.rb

@@ -18,8 +18,16 @@ class Config < Anyway::Config
       attr_config delivery_method: "inline", queue: "default", job_class: "GraphQL::Jobs::TriggerJob"
 
       def job_class=(value)
-        if value.nil? || value == ""
-          raise_validation_error "job_class can not be empty"
+        if empty_value?(value)
+          raise_validation_error "job_class can not be blank"
+        end
+
+        super
+      end
+
+      def queue=(value)
+        if empty_value?(value)
+          raise_validation_error "queue can not be blank"
         end
 
         super
@@ -34,6 +42,12 @@ def delivery_method=(value)
 
         super
       end
+
+      private
+
+      def empty_value?(value)
+        value.nil? || value == ""
+      end
     end
   end
 end

spec/graphql/anycable_spec.rb

@@ -300,5 +300,32 @@
       expect(config.queue).to eq("test")
       expect(config.job_class).to eq("CustomJob")
     end
+
+    context "when entered invalid delivery_method" do
+      it "raises an error" do
+        expect { described_class.delivery_method(nil) }.to raise_error(
+          Anyway::Config::ValidationError,
+          /Unknown delivery method - . Allowed methods: inline, active_job/,
+        )
+      end
+    end
+
+    context "when entered invalid queue" do
+      it "raises an error" do
+        expect { described_class.delivery_method("inline", queue: nil) }.to raise_error(
+          Anyway::Config::ValidationError,
+          /queue can not be blank/,
+        )
+      end
+    end
+
+    context "when entered invalid queue" do
+      it "raises an error" do
+        expect { described_class.delivery_method("inline", job_class: "") }.to raise_error(
+          Anyway::Config::ValidationError,
+          /job_class can not be blank/,
+        )
+      end
+    end
   end
 end