Implement test

Author: bangseongbeom

Gemfile

@@ -13,3 +13,5 @@ gem "rake-compiler"
 gem "minitest", "~> 5.16"
 
 gem "rubocop", "~> 1.21"
+
+gem "oj", "~> 3.16"

Gemfile.lock

@@ -8,6 +8,7 @@ GEM
   remote: https://rubygems.org/
   specs:
     ast (2.4.3)
+    bigdecimal (4.1.1)
     date (3.5.1)
     erb (6.0.2)
     io-console (0.8.2)
@@ -20,6 +21,10 @@ GEM
     language_server-protocol (3.17.0.5)
     lint_roller (1.1.0)
     minitest (5.27.0)
+    oj (3.16.16)
+      bigdecimal (>= 3.0)
+      ostruct (>= 0.2)
+    ostruct (0.6.3)
     parallel (1.27.0)
     parser (3.3.11.1)
       ast (~> 2.4.1)
@@ -74,13 +79,15 @@ PLATFORMS
 DEPENDENCIES
   irb
   minitest (~> 5.16)
+  oj (~> 3.16)
   rake (~> 13.0)
   rake-compiler
   rubocop (~> 1.21)
   urlpattern!
 
 CHECKSUMS
   ast (2.4.3) sha256=954615157c1d6a382bc27d690d973195e79db7f55e9765ac7c481c60bdb4d383
+  bigdecimal (4.1.1) sha256=1c09efab961da45203c8316b0cdaec0ff391dfadb952dd459584b63ebf8054ca
   date (3.5.1) sha256=750d06384d7b9c15d562c76291407d89e368dda4d4fff957eb94962d325a0dc0
   erb (6.0.2) sha256=9fe6264d44f79422c87490a1558479bd0e7dad4dd0e317656e67ea3077b5242b
   io-console (0.8.2) sha256=d6e3ae7a7cc7574f4b8893b4fca2162e57a825b223a177b7afa236c5ef9814cc
@@ -89,6 +96,8 @@ CHECKSUMS
   language_server-protocol (3.17.0.5) sha256=fd1e39a51a28bf3eec959379985a72e296e9f9acfce46f6a79d31ca8760803cc
   lint_roller (1.1.0) sha256=2c0c845b632a7d172cb849cc90c1bce937a28c5c8ccccb50dfd46a485003cc87
   minitest (5.27.0) sha256=2d3b17f8a36fe7801c1adcffdbc38233b938eb0b4966e97a6739055a45fa77d5
+  oj (3.16.16) sha256=3635b36128991796434f55da8decc0de236a323535adcb36fc04e6d0253c013d
+  ostruct (0.6.3) sha256=95a2ed4a4bd1d190784e666b47b2d3f078e4a9efda2fccf18f84ddc6538ed912
   parallel (1.27.0) sha256=4ac151e1806b755fb4e2dc2332cbf0e54f2e24ba821ff2d3dcf86bf6dc4ae130
   parser (3.3.11.1) sha256=d17ace7aabe3e72c3cc94043714be27cc6f852f104d81aa284c2281aecc65d54
   pp (0.6.3) sha256=2951d514450b93ccfeb1df7d021cae0da16e0a7f95ee1e2273719669d0ab9df6