Make sure protected can't be null; Test protected!

db/schema.rb

@@ -356,7 +356,7 @@ ActiveRecord::Schema.define(version: 20170525174156) do
     t.string "encrypted_value_salt"
     t.string "encrypted_value_iv"
     t.integer "project_id", null: false
-    t.boolean "protected", default: false
+    t.boolean "protected", default: false, null: false
   end
 
   add_index "ci_variables", ["project_id"], name: "index_ci_variables_on_project_id", using: :btree
@@ -1493,4 +1493,4 @@ ActiveRecord::Schema.define(version: 20170525174156) do
   add_foreign_key "trending_projects", "projects", on_delete: :cascade
   add_foreign_key "u2f_registrations", "users"
   add_foreign_key "web_hook_logs", "web_hooks", on_delete: :cascade
-end
+end
\ No newline at end of file

spec/models/ci/variable_spec.rb

@@ -12,11 +12,33 @@ describe Ci::Variable, models: true do
   it { is_expected.not_to allow_value('foo bar').for(:key) }
   it { is_expected.not_to allow_value('foo/bar').for(:key) }
 
-  before :each do
-    subject.value = secret_value
+  describe '.unprotected' do
+    subject { described_class.unprotected }
+
+    context 'when variable is protected' do
+      before do
+        create(:ci_variable, :protected)
+      end
+
+      it 'returns nothing' do
+        is_expected.to be_empty
+      end
+    end
+
+    context 'when variable is not protected' do
+      let(:variable) { create(:ci_variable, protected: false) }
+
+      it 'returns the variable' do
+        is_expected.to contain_exactly(variable)
+      end
+    end
   end
 
   describe '#value' do
+    before do
+      subject.value = secret_value
+    end
+
     it 'stores the encrypted value' do
       expect(subject.encrypted_value).not_to be_nil
     end