Add specs for Mutant::Subject#indentification

spec/unit/mutant/subject_spec.rb

@@ -0,0 +1,39 @@
+require 'spec_helper'
+
+describe Mutant::Subject do
+  let(:class_under_test) do
+    Class.new(described_class) do
+      def match_expression
+        'match'
+      end
+    end
+  end
+
+  let(:object) { class_under_test.new(context, node) }
+
+  let(:node) do
+    double('Node', :location => location)
+  end
+
+  let(:location) do
+    double('Location', :expression => expression)
+  end
+
+  let(:expression) do
+    double('Expression', :line => 'source_line')
+  end
+
+  let(:context) do
+    double(
+      'Context',
+      :source_path => 'source_path',
+      :source_line => 'source_line',
+    )
+  end
+
+  describe '#identification' do
+    subject { object.identification }
+
+    it { should eql('match:source_path:source_line') }
+  end
+end