Actually Use GSL in CI Tests (#197)

Merge pull request 197

Author: mkasberg

.github/workflows/ci.yml

@@ -19,6 +19,7 @@ jobs:
     env:
       # See https://github.com/marketplace/actions/setup-ruby-jruby-and-truffleruby#matrix-of-gemfiles
       BUNDLE_GEMFILE: ${{ matrix.gemfile }}
+      LOAD_GSL: ${{ matrix.gsl }}
     strategy:
       fail-fast: false
       matrix:
@@ -54,9 +55,6 @@ jobs:
         with:
           ruby-version: ${{ matrix.ruby_version }}
           bundler-cache: true
-      - name: Install GSL Gem
-        if: ${{ matrix.gsl }}
-        run: gem install gsl
       - name: Run Minitest based tests
         run: script/test
 

Gemfile

@@ -2,3 +2,6 @@
 
 source 'https://rubygems.org'
 gemspec name: 'classifier-reborn'
+
+# For testing with GSL support & bundle exec
+gem 'gsl' if ENV['LOAD_GSL'] == 'true'

test/extensions/matrix_test.rb

@@ -2,6 +2,8 @@
 
 class MatrixTest < Minitest::Test
   def test_zero_division
+    skip "extensions/vector is only used by non-GSL implementation" if $GSL
+    
     matrix = Matrix[[1, 0], [0, 1]]
     matrix.SV_decomp
   end

test/extensions/zero_vector_test.rb

@@ -2,6 +2,8 @@
 
 class ZeroVectorTest < Minitest::Test
   def test_zero?
+    skip "extensions/zero_vector is only used by non-GSL implementation" if $GSL
+
     vec0 = Vector[]
     vec1 = Vector[0]
     vec10 = Vector.elements [0] * 10