Improve coverage of Formatter#awesome_object

Cover the case when the option plain is false, this way show the
colorized object.

Cover the multiline option as false, this way show the content in a
single line.

spec/objects_spec.rb

@@ -77,6 +77,50 @@ EOS
     attr_reader :abra = 1,
     attr_writer :ca = 2
 >
+EOS
+      expect(out.gsub(/0x([a-f\d]+)/, "0x01234567")).to eq(str)
+      expect(hello.ai(:plain => true, :raw => false)).to eq(hello.inspect)
+    end
+
+    it "without the plain options print the colorized values" do
+      class Hello
+        attr_reader   :abra
+        attr_writer   :ca
+
+        def initialize
+          @abra, @ca = 1, 2
+          @dabra = 3
+        end
+      end
+
+      hello = Hello.new
+      out = hello.ai(:raw => true)
+      str = <<-EOS.strip
+#<Hello:0x01234567
+    \e[0;36m@dabra\e[0m\e[0;37m = \e[0m\e[1;34m3\e[0m,
+    \e[1;36mattr_reader\e[0m \e[0;35m:abra\e[0m\e[0;37m = \e[0m\e[1;34m1\e[0m,
+    \e[1;36mattr_writer\e[0m \e[0;35m:ca\e[0m\e[0;37m = \e[0m\e[1;34m2\e[0m
+>
+EOS
+      expect(out.gsub(/0x([a-f\d]+)/, "0x01234567")).to eq(str)
+      expect(hello.ai(:plain => true, :raw => false)).to eq(hello.inspect)
+    end
+
+    it "with multine as false show inline values" do
+      class Hello
+        attr_reader   :abra
+        attr_writer   :ca
+
+        def initialize
+          @abra, @ca = 1, 2
+          @dabra = 3
+        end
+      end
+
+      hello = Hello.new
+      out = hello.ai(:multiline => false, :plain => true, :raw => true)
+      str = <<-EOS.strip
+#<Hello:0x01234567 @dabra = 3, attr_reader :abra = 1, attr_writer :ca = 2>
 EOS
       expect(out.gsub(/0x([a-f\d]+)/, "0x01234567")).to eq(str)
       expect(hello.ai(:plain => true, :raw => false)).to eq(hello.inspect)