Consolidate DELTA constant in test_helper.rb

Author: kojix2

Diff for: test/dataanalysis_test.rb

@@ -1,7 +1,5 @@
 require_relative 'test_helper'
 
-DELTA = 1e-5
-
 class AlglibDataAnalysisTest < Test::Unit::TestCase
   def test_sample_mean
     s2 = r(<<~R)

Diff for: test/statistics_test.rb

@@ -1,7 +1,5 @@
 require_relative 'test_helper'
 
-DELTA = 1e-5
-
 class AlglibStatisticsTest < Test::Unit::TestCase
   def test_sample_mean
     assert_equal r('mean(c(1, 2))').to_f, Alglib.sample_mean([1, 2])

Diff for: test/test_helper.rb

@@ -5,6 +5,8 @@
 require 'open3'
 require 'test-unit'
 
+DELTA = 1e-5
+
 # Run code in Rscript
 def r(*code)
   cmd = "Rscript #{code.map { |c| "-e '#{c}'" }.join(' ')}"