feat: add ArgumentSet#empty?

Returns whether an argument set has no arguments provided or not.

Author: adamcooke

lib/apia/argument_set.rb

@@ -122,6 +122,13 @@ def has?(key)
       @source.key?(key.to_sym)
     end
 
+    # Return whether the argument set has no arguments within?
+    #
+    # @return [Boolean]
+    def empty?
+      @source.empty?
+    end
+
     # Validate an argument set and return any errors as appropriate
     #
     # @param argument [Apia::Argument]

spec/specs/apia/argument_set_spec.rb

@@ -416,6 +416,24 @@
     end
   end
 
+  context '#empty' do
+    it 'is true if there are no arguments' do
+      as = Apia::ArgumentSet.create('ExampleSet') do
+        argument :name, type: :string
+      end
+      instance = as.new({})
+      expect(instance.empty?).to be true
+    end
+
+    it 'is false if there are arguments' do
+      as = Apia::ArgumentSet.create('ExampleSet') do
+        argument :name, type: :string
+      end
+      instance = as.new({ name: 'Dave' })
+      expect(instance.empty?).to be false
+    end
+  end
+
   context '#to_hash' do
     it 'should return a hash of the values' do
       as = Apia::ArgumentSet.create('ExampleSet') do