Use debugger instead of byebug

Gemfile

@@ -9,8 +9,7 @@ gem 'rdf-vocab', '~>3.0'
 gem 'rexml', '~>3.2'
 
 group :debug do
-  gem 'byebug', require: false, platforms: :mri
-  gem 'ruby-debug', require: false, platforms: :jruby
+  gem 'debug', '>= 1.0', require: false, platforms: :mri
 end
 
 group :test do

Gemfile.lock

@@ -10,8 +10,6 @@ GEM
   specs:
     bcp47_spec (0.2.1)
     builder (3.2.4)
-    byebug (11.1.3)
-    columnize (0.9.0)
     cucumber (9.1.1)
       builder (~> 3.2, >= 3.2.4)
       cucumber-ci-environment (~> 9.2, >= 9.2.0)
@@ -36,21 +34,32 @@ GEM
       cucumber-messages (> 19, < 25)
     cucumber-messages (22.0.0)
     cucumber-tag-expressions (5.0.6)
+    debug (1.9.1)
+      irb (~> 1.10)
+      reline (>= 0.3.8)
     diff-lcs (1.5.0)
     docile (1.4.0)
     ffi (1.16.3)
     ffi (1.16.3-java)
     gnuplot (2.6.2)
     iconv (1.0.8)
+    io-console (0.7.1)
+    io-console (0.7.1-java)
+    irb (1.11.0)
+      rdoc
+      reline (>= 0.3.8)
+    jar-dependencies (0.4.1)
     json (2.7.1)
     json (2.7.1-java)
     latex-decode (0.4.0)
-    linecache (1.3.1)
-    linecache (1.3.1-java)
     link_header (0.0.8)
     mini_mime (1.1.5)
     minitest (5.20.0)
     multi_test (1.1.0)
+    psych (5.1.2)
+      stringio
+    psych (5.1.2-java)
+      jar-dependencies (>= 0.1.7)
     racc (1.7.3)
     racc (1.7.3-java)
     rake (13.1.0)
@@ -59,20 +68,20 @@ GEM
       link_header (~> 0.0, >= 0.0.8)
     rdf-vocab (3.3.0)
       rdf (~> 3.3)
+    rdoc (6.6.2)
+      psych (>= 4.0.0)
     redcarpet (3.6.0)
+    reline (0.4.2)
+      io-console (~> 0.5)
     rexml (3.2.6)
-    ruby-debug (0.11.0)
-      columnize (>= 0.1)
-      linecache (~> 1.3.1)
-      ruby-debug-base (~> 0.11.0.0)
-    ruby-debug-base (0.11.0-java)
     ruby-prof (1.7.0)
     simplecov (0.22.0)
       docile (~> 1.1)
       simplecov-html (~> 0.11)
       simplecov_json_formatter (~> 0.1)
     simplecov-html (0.12.3)
     simplecov_json_formatter (0.1.4)
+    stringio (3.1.0)
     sys-uname (1.2.3)
       ffi (~> 1.1)
     unicode (0.4.4.4)
@@ -85,8 +94,8 @@ PLATFORMS
 
 DEPENDENCIES
   bibtex-ruby!
-  byebug
   cucumber
+  debug (>= 1.0)
   gnuplot
   iconv
   json (~> 2.0)
@@ -96,7 +105,6 @@ DEPENDENCIES
   rdf-vocab (~> 3.0)
   redcarpet
   rexml (~> 3.2)
-  ruby-debug
   ruby-prof
   simplecov
   unicode (~> 0.4)

features/support/env.rb

@@ -6,7 +6,7 @@
 end
 
 begin
-  require 'debugger'
+  require 'debug'
 rescue LoadError
   # ignore
 end

test/helper.rb

@@ -5,12 +5,7 @@
 end
 
 begin
-  if RUBY_PLATFORM < 'java'
-    require 'debug'
-    Debugger.start
-  else
-    require 'byebug'
-  end
+  require 'debug'
 rescue LoadError
   # ignore
 end