Add test to ruby extern requirement

Closes #134

spec/language/abstract_container/extern_requirement_spec.rb

@@ -0,0 +1,13 @@
+require_relative '../../spec_helper'
+
+RSpec.describe Languages::ExternRequirement do
+
+  context "When not implemented" do
+    it "Get requirement" do
+      externAbstract = Languages::ExternRequirement.new
+      expect{externAbstract.get_requirement("nothing")}.to raise_error(
+              NotImplementedError)
+    end
+  end
+
+end

spec/language/ruby/extern_requirement_ruby_spec.rb

@@ -0,0 +1,59 @@
+require_relative '../../spec_helper'
+
+RSpec.describe Languages::Ruby::ExternRequirementRuby do
+
+  before :all do
+    @extern = Languages::Ruby::ExternRequirementRuby.new
+  end
+
+  context "Simple case of match" do
+    it "'Require', Normal case" do
+       result = @extern.get_requirement('require "xpto"')
+       expect(result.library).to eq('xpto')
+    end
+
+    it "'require_relative', Normal case" do
+       result = @extern.get_requirement('require_relative "xpto"')
+       expect(result.library).to eq('xpto')
+    end
+  end
+
+  context "Find requires with multiple spaces" do
+    it "A lot of space at the end (require)" do
+       result = @extern.get_requirement('require "xpto"                ')
+       expect(result.library).to eq('xpto')
+    end
+
+    it "A lot of space at the end (require_relative)" do
+       result = @extern.get_requirement('require_relative "xpto"       ')
+       expect(result.library).to eq('xpto')
+    end
+
+    it "A lot of space at the beginning (require)" do
+       result = @extern.get_requirement('require              "xpto"')
+       expect(result.library).to eq('xpto')
+    end
+
+    it "A lot of space at the beginning (require_relative)" do
+       result = @extern.get_requirement('require_relative            "xpto"')
+       expect(result.library).to eq('xpto')
+    end
+
+    it "A lot of space at the beginning and the end (require_relative)" do
+       result = @extern.get_requirement('require_relative         "xpto"  ')
+       expect(result.library).to eq('xpto')
+    end
+
+    it "A lot of space at the beginning and the end (require)" do
+       result = @extern.get_requirement('require         "xpto"  ')
+       expect(result.library).to eq('xpto')
+    end
+
+  end
+
+  after :all do
+    @extern = nil
+  end
+
+end
+