add rspec

Gemfile.lock

@@ -74,6 +74,7 @@ GEM
     debug (1.4.0)
       irb (>= 1.3.6)
       reline (>= 0.2.7)
+    diff-lcs (1.5.0)
     digest (3.1.0)
     erubi (1.10.0)
     globalid (1.0.0)
@@ -148,6 +149,23 @@ GEM
     rake (13.0.6)
     reline (0.3.1)
       io-console (~> 0.5)
+    rspec-core (3.11.0)
+      rspec-support (~> 3.11.0)
+    rspec-expectations (3.11.0)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.11.0)
+    rspec-mocks (3.11.0)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.11.0)
+    rspec-rails (5.1.0)
+      actionpack (>= 5.2)
+      activesupport (>= 5.2)
+      railties (>= 5.2)
+      rspec-core (~> 3.10)
+      rspec-expectations (~> 3.10)
+      rspec-mocks (~> 3.10)
+      rspec-support (~> 3.10)
+    rspec-support (3.11.0)
     strscan (3.0.1)
     thor (1.2.1)
     timeout (0.2.0)
@@ -167,6 +185,7 @@ DEPENDENCIES
   pg (~> 1.1)
   puma (~> 5.0)
   rails (~> 7.0.2, >= 7.0.2.2)
+  rspec-rails (~> 5.1)
   tzinfo-data
 
 RUBY VERSION