Improve merge! to use key format and ignore value

This method is just a convenient way to merge an already computed hash
but we should respect the key format and ignore value just like manually
interating and setting each key and value.

Author: sobrinho

lib/abstract_builder.rb

@@ -29,7 +29,9 @@ def set!(key, value)
   end
 
   def merge!(value)
-    @stack << [:merge, value]
+    value.each_pair do |key, value|
+      set! key, value
+    end
   end
 
   def call(object, *keys)
@@ -64,8 +66,6 @@ def data!
       when :set
         key = _format_key(key)
         data[key] = value unless _ignore_value?(value)
-      when :merge
-        data.merge!(key)
       else
         raise ArgumentError, "Unexpected command: #{command.inspect}"
       end

spec/abstract_builder_spec.rb

@@ -58,6 +58,24 @@
 
       expect(subject.data!).to eq(key: "value")
     end
+
+    it "formats keys of the given hash" do
+      subject.format_key! { |key| key.upcase }
+
+      subject.merge! key: true
+
+      expect(subject.data!).to eq(
+        KEY: true
+      )
+    end
+
+    it "ignores values of the given hash" do
+      subject.ignore_value! { |value| value.nil? }
+
+      subject.merge! absence: nil, presence: true
+
+      expect(subject.data!).to eq(presence: true)
+    end
   end
 
   describe "#call" do