Add specs

Author: jibarra

spec/lib/code_ownership/private/codeowners_file_spec.rb

@@ -0,0 +1,36 @@
+module CodeOwnership
+  RSpec.describe Private::CodeownersFile do
+    describe '.path' do
+      subject { described_class.path }
+
+      context 'when the environment variable is set' do
+        before do
+          allow(ENV).to receive(:fetch).and_call_original
+          allow(ENV).to receive(:fetch).with('CODEOWNERS_PATH', anything).and_return(path)
+        end
+
+        context "to 'foo'" do
+          let(:path) { 'foo' }
+
+          it 'uses the environment variable' do
+            expect(subject).to eq(Pathname.pwd.join('foo', 'CODEOWNERS'))
+          end
+        end
+
+        context 'to empty' do
+          let(:path) { '' }
+
+          it 'uses the environment variable' do
+            expect(subject).to eq(Pathname.pwd.join('CODEOWNERS'))
+          end
+        end
+      end
+
+      context 'when the environment variable is not set' do
+        it 'uses the default' do
+          expect(subject).to eq(Pathname.pwd.join('.github', 'CODEOWNERS'))
+        end
+      end
+    end
+  end
+end