diff --git a/app/models/ci/pipeline.rb b/app/models/ci/pipeline.rb
index 53af87a271ad2f6b88d74893cdf428992a81c279..5eb30f4aaa05e48ab456fb0ea0a40d9f2dd77596 100644
--- a/app/models/ci/pipeline.rb
+++ b/app/models/ci/pipeline.rb
@@ -7,12 +7,17 @@ module Ci
     include Presentable
     include Gitlab::OptimisticLocking
     include Gitlab::Utils::StrongMemoize
+    include AtomicInternalId
 
     belongs_to :project, inverse_of: :pipelines
     belongs_to :user
     belongs_to :auto_canceled_by, class_name: 'Ci::Pipeline'
     belongs_to :pipeline_schedule, class_name: 'Ci::PipelineSchedule'
 
+    has_internal_id :iid, scope: :project, presence: false, init: ->(s) do
+      s&.project&.pipelines&.maximum(:iid) || s&.project&.pipelines&.count
+    end
+
     has_many :stages
     has_many :statuses, class_name: 'CommitStatus', foreign_key: :commit_id, inverse_of: :pipeline
     has_many :builds, foreign_key: :commit_id, inverse_of: :pipeline
@@ -531,6 +536,7 @@ module Ci
 
     def predefined_variables
       Gitlab::Ci::Variables::Collection.new
+        .append(key: 'CI_PIPELINE_IID', value: iid.to_s)
         .append(key: 'CI_CONFIG_PATH', value: ci_yaml_file_path)
         .append(key: 'CI_PIPELINE_SOURCE', value: source.to_s)
         .append(key: 'CI_COMMIT_MESSAGE', value: git_commit_message)
diff --git a/app/models/concerns/atomic_internal_id.rb b/app/models/concerns/atomic_internal_id.rb
index 22f516a172fea422f66da73bb478797d0358a575..164c704260e9268c989dfe8378a472701e5417ad 100644
--- a/app/models/concerns/atomic_internal_id.rb
+++ b/app/models/concerns/atomic_internal_id.rb
@@ -25,9 +25,13 @@ module AtomicInternalId
   extend ActiveSupport::Concern
 
   module ClassMethods
-    def has_internal_id(column, scope:, init:) # rubocop:disable Naming/PredicateName
-      before_validation(on: :create) do
+    def has_internal_id(column, scope:, init:, presence: true) # rubocop:disable Naming/PredicateName
+      before_validation :"ensure_#{scope}_#{column}!", on: :create
+      validates column, presence: presence
+
+      define_method("ensure_#{scope}_#{column}!") do
         scope_value = association(scope).reader
+
         if read_attribute(column).blank? && scope_value
           scope_attrs = { scope_value.class.table_name.singularize.to_sym => scope_value }
           usage = self.class.table_name.to_sym
@@ -35,13 +39,9 @@ module AtomicInternalId
           new_iid = InternalId.generate_next(self, scope_attrs, usage, init)
           write_attribute(column, new_iid)
         end
-      end
 
-      validates column, presence: true, numericality: true
+        read_attribute(column)
+      end
     end
   end
-
-  def to_param
-    iid.to_s
-  end
 end
diff --git a/app/models/concerns/iid_routes.rb b/app/models/concerns/iid_routes.rb
new file mode 100644
index 0000000000000000000000000000000000000000..246748cf52cb35788a61454952ecefc8b66728cd
--- /dev/null
+++ b/app/models/concerns/iid_routes.rb
@@ -0,0 +1,9 @@
+module IidRoutes
+  ##
+  # This automagically enforces all related routes to use `iid` instead of `id`
+  # If you want to use `iid` for some routes and `id` for other routes, this module should not to be included,
+  # instead you should define `iid` or `id` explictly at each route generators. e.g. pipeline_path(project.id, pipeline.iid)
+  def to_param
+    iid.to_s
+  end
+end
diff --git a/app/models/deployment.rb b/app/models/deployment.rb
index 254764eefde1df19bdfe7711c15c31e82359e1c9..ac86e9e8de06398708ecc5030115b5bcf61d86f3 100644
--- a/app/models/deployment.rb
+++ b/app/models/deployment.rb
@@ -1,5 +1,6 @@
 class Deployment < ActiveRecord::Base
   include AtomicInternalId
+  include IidRoutes
 
   belongs_to :project, required: true
   belongs_to :environment, required: true
diff --git a/app/models/internal_id.rb b/app/models/internal_id.rb
index f7f930e86ed4be792ea8b8c316596366ba0bc355..f50f28deffe0c052b24fdbf9864158c9d7dc9057 100644
--- a/app/models/internal_id.rb
+++ b/app/models/internal_id.rb
@@ -14,7 +14,7 @@ class InternalId < ActiveRecord::Base
   belongs_to :project
   belongs_to :namespace
 
-  enum usage: { issues: 0, merge_requests: 1, deployments: 2, milestones: 3, epics: 4 }
+  enum usage: { issues: 0, merge_requests: 1, deployments: 2, milestones: 3, epics: 4, ci_pipelines: 5 }
 
   validates :usage, presence: true
 
diff --git a/app/models/issue.rb b/app/models/issue.rb
index 41a290f34b454433febd4eb2c604fb1c87155c14..d136700836df6a5a486e52b29f83089bdf91097a 100644
--- a/app/models/issue.rb
+++ b/app/models/issue.rb
@@ -2,6 +2,7 @@ require 'carrierwave/orm/activerecord'
 
 class Issue < ActiveRecord::Base
   include AtomicInternalId
+  include IidRoutes
   include Issuable
   include Noteable
   include Referable
diff --git a/app/models/merge_request.rb b/app/models/merge_request.rb
index 79fc155fd3cab288926e85d207f895a783e53983..4c1628d2bdb33f27eab7c5f76abc63f97add2301 100644
--- a/app/models/merge_request.rb
+++ b/app/models/merge_request.rb
@@ -1,5 +1,6 @@
 class MergeRequest < ActiveRecord::Base
   include AtomicInternalId
+  include IidRoutes
   include Issuable
   include Noteable
   include Referable
diff --git a/app/models/milestone.rb b/app/models/milestone.rb
index d14e3a4ded56349ea58ffa8ab724ff54eac74c30..d05dcfd083a61f8c89bf70a164c9141c1697615d 100644
--- a/app/models/milestone.rb
+++ b/app/models/milestone.rb
@@ -9,6 +9,7 @@ class Milestone < ActiveRecord::Base
 
   include CacheMarkdownField
   include AtomicInternalId
+  include IidRoutes
   include Sortable
   include Referable
   include StripAttribute
diff --git a/changelogs/unreleased/per-project-pipeline-iid.yml b/changelogs/unreleased/per-project-pipeline-iid.yml
new file mode 100644
index 0000000000000000000000000000000000000000..78a513a9986bcb022ef76caab73a4ea01d01f41e
--- /dev/null
+++ b/changelogs/unreleased/per-project-pipeline-iid.yml
@@ -0,0 +1,5 @@
+---
+title: Add per-project pipeline id
+merge_request: 18558
+author:
+type: added
diff --git a/db/migrate/20180424160449_add_pipeline_iid_to_ci_pipelines.rb b/db/migrate/20180424160449_add_pipeline_iid_to_ci_pipelines.rb
new file mode 100644
index 0000000000000000000000000000000000000000..e8f0c91d612a885d9e0ae9abb239679da6df0f93
--- /dev/null
+++ b/db/migrate/20180424160449_add_pipeline_iid_to_ci_pipelines.rb
@@ -0,0 +1,13 @@
+class AddPipelineIidToCiPipelines < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  def up
+    add_column :ci_pipelines, :iid, :integer
+  end
+
+  def down
+    remove_column :ci_pipelines, :iid, :integer
+  end
+end
diff --git a/db/migrate/20180425205249_add_index_constraints_to_pipeline_iid.rb b/db/migrate/20180425205249_add_index_constraints_to_pipeline_iid.rb
new file mode 100644
index 0000000000000000000000000000000000000000..3fa59b44d5d79014ea5e590af37c79b05c7e6403
--- /dev/null
+++ b/db/migrate/20180425205249_add_index_constraints_to_pipeline_iid.rb
@@ -0,0 +1,15 @@
+class AddIndexConstraintsToPipelineIid < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  disable_ddl_transaction!
+
+  def up
+    add_concurrent_index :ci_pipelines, [:project_id, :iid], unique: true, where: 'iid IS NOT NULL'
+  end
+
+  def down
+    remove_concurrent_index :ci_pipelines, [:project_id, :iid]
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index 97247387bc7a385468f603a080e16c0d77043b11..0d6b44d1b92d1c792a51d920ad34a4c1e080949c 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -451,10 +451,12 @@ ActiveRecord::Schema.define(version: 20180529093006) do
     t.integer "config_source"
     t.boolean "protected"
     t.integer "failure_reason"
+    t.integer "iid"
   end
 
   add_index "ci_pipelines", ["auto_canceled_by_id"], name: "index_ci_pipelines_on_auto_canceled_by_id", using: :btree
   add_index "ci_pipelines", ["pipeline_schedule_id"], name: "index_ci_pipelines_on_pipeline_schedule_id", using: :btree
+  add_index "ci_pipelines", ["project_id", "iid"], name: "index_ci_pipelines_on_project_id_and_iid", unique: true, where: "(iid IS NOT NULL)", using: :btree
   add_index "ci_pipelines", ["project_id", "ref", "status", "id"], name: "index_ci_pipelines_on_project_id_and_ref_and_status_and_id", using: :btree
   add_index "ci_pipelines", ["project_id", "sha"], name: "index_ci_pipelines_on_project_id_and_sha", using: :btree
   add_index "ci_pipelines", ["project_id"], name: "index_ci_pipelines_on_project_id", using: :btree
diff --git a/doc/ci/variables/README.md b/doc/ci/variables/README.md
index f10423b92cf544ebbd73b5ac321cc1e7ea76ef57..aa4395b01a9f7d86d3c9b2c7485e9c30a51bbd78 100644
--- a/doc/ci/variables/README.md
+++ b/doc/ci/variables/README.md
@@ -72,6 +72,7 @@ future GitLab releases.**
 | **CI_RUNNER_REVISION**          | all    | 10.6   | GitLab Runner revision that is executing the current job |
 | **CI_RUNNER_EXECUTABLE_ARCH**   | all    | 10.6   | The OS/architecture of the GitLab Runner executable (note that this is not necessarily the same as the environment of the executor) |
 | **CI_PIPELINE_ID**              | 8.10   | 0.5    | The unique id of the current pipeline that GitLab CI uses internally |
+| **CI_PIPELINE_IID**             | 11.0   | all    | The unique id of the current pipeline scoped to project |
 | **CI_PIPELINE_TRIGGERED**       | all    | all    | The flag to indicate that job was [triggered] |
 | **CI_PIPELINE_SOURCE**          | 10.0   | all    | Indicates how the pipeline was triggered. Possible options are: `push`, `web`, `trigger`, `schedule`, `api`, and `pipeline`. For pipelines created before GitLab 9.5, this will show as `unknown` |
 | **CI_PROJECT_DIR**              | all    | all    | The full path where the repository is cloned and where the job is run |
@@ -352,6 +353,8 @@ Running on runner-8a2f473d-project-1796893-concurrent-0 via runner-8a2f473d-mach
 ++ CI_PROJECT_URL=https://example.com/gitlab-examples/ci-debug-trace
 ++ export CI_PIPELINE_ID=52666
 ++ CI_PIPELINE_ID=52666
+++ export CI_PIPELINE_IID=123
+++ CI_PIPELINE_IID=123
 ++ export CI_RUNNER_ID=1337
 ++ CI_RUNNER_ID=1337
 ++ export CI_RUNNER_DESCRIPTION=shared-runners-manager-1.example.com
@@ -439,6 +442,7 @@ export CI_JOB_MANUAL="true"
 export CI_JOB_TRIGGERED="true"
 export CI_JOB_TOKEN="abcde-1234ABCD5678ef"
 export CI_PIPELINE_ID="1000"
+export CI_PIPELINE_IID="10"
 export CI_PROJECT_ID="34"
 export CI_PROJECT_DIR="/builds/gitlab-org/gitlab-ce"
 export CI_PROJECT_NAME="gitlab-ce"
diff --git a/lib/gitlab/ci/pipeline/chain/populate.rb b/lib/gitlab/ci/pipeline/chain/populate.rb
index 69b8a8fc68ff662746dfdf58feadaae0effce6ff..f34c11ca3c2677a697cbacc65ab0513113431145 100644
--- a/lib/gitlab/ci/pipeline/chain/populate.rb
+++ b/lib/gitlab/ci/pipeline/chain/populate.rb
@@ -8,6 +8,9 @@ module Gitlab
           PopulateError = Class.new(StandardError)
 
           def perform!
+            # Allocate next IID. This operation must be outside of transactions of pipeline creations.
+            pipeline.ensure_project_iid!
+
             ##
             # Populate pipeline with block argument of CreatePipelineService#execute.
             #
diff --git a/spec/lib/gitlab/ci/pipeline/chain/populate_spec.rb b/spec/lib/gitlab/ci/pipeline/chain/populate_spec.rb
index 4d7d6951a519ed9a1b8394ca0f0e29f448e193db..c5a4d9b477862d264391193bdf6776c1ba2f8c28 100644
--- a/spec/lib/gitlab/ci/pipeline/chain/populate_spec.rb
+++ b/spec/lib/gitlab/ci/pipeline/chain/populate_spec.rb
@@ -42,6 +42,10 @@ describe Gitlab::Ci::Pipeline::Chain::Populate do
     it 'correctly assigns user' do
       expect(pipeline.builds).to all(have_attributes(user: user))
     end
+
+    it 'has pipeline iid' do
+      expect(pipeline.iid).to be > 0
+    end
   end
 
   context 'when pipeline is empty' do
@@ -68,6 +72,10 @@ describe Gitlab::Ci::Pipeline::Chain::Populate do
       expect(pipeline.errors.to_a)
         .to include 'No stages / jobs for this pipeline.'
     end
+
+    it 'wastes pipeline iid' do
+      expect(InternalId.ci_pipelines.where(project_id: project.id).last.last_value).to be > 0
+    end
   end
 
   context 'when pipeline has validation errors' do
@@ -87,6 +95,10 @@ describe Gitlab::Ci::Pipeline::Chain::Populate do
       expect(pipeline.errors.to_a)
         .to include 'Failed to build the pipeline!'
     end
+
+    it 'wastes pipeline iid' do
+      expect(InternalId.ci_pipelines.where(project_id: project.id).last.last_value).to be > 0
+    end
   end
 
   context 'when there is a seed blocks present' do
@@ -111,6 +123,12 @@ describe Gitlab::Ci::Pipeline::Chain::Populate do
         expect(pipeline.variables.first.key).to eq 'VAR'
         expect(pipeline.variables.first.value).to eq '123'
       end
+
+      it 'has pipeline iid' do
+        step.perform!
+
+        expect(pipeline.iid).to be > 0
+      end
     end
 
     context 'when seeds block tries to persist some resources' do
@@ -121,6 +139,12 @@ describe Gitlab::Ci::Pipeline::Chain::Populate do
       it 'raises exception' do
         expect { step.perform! }.to raise_error(ActiveRecord::RecordNotSaved)
       end
+
+      it 'wastes pipeline iid' do
+        expect { step.perform! }.to raise_error
+
+        expect(InternalId.ci_pipelines.where(project_id: project.id).last.last_value).to be > 0
+      end
     end
   end
 
@@ -132,22 +156,39 @@ describe Gitlab::Ci::Pipeline::Chain::Populate do
     end
   end
 
-  context 'when using only/except build policies' do
-    let(:config) do
-      { rspec: { script: 'rspec', stage: 'test', only: ['master'] },
-        prod: { script: 'cap prod', stage: 'deploy', only: ['tags'] } }
-    end
+  context 'when variables policy is specified' do
+    shared_examples_for 'a correct pipeline' do
+      it 'populates pipeline according to used policies' do
+        step.perform!
 
-    let(:pipeline) do
-      build(:ci_pipeline, ref: 'master', config: config)
+        expect(pipeline.stages.size).to eq 1
+        expect(pipeline.stages.first.builds.size).to eq 1
+        expect(pipeline.stages.first.builds.first.name).to eq 'rspec'
+      end
     end
 
-    it 'populates pipeline according to used policies' do
-      step.perform!
+    context 'when using only/except build policies' do
+      let(:config) do
+        { rspec: { script: 'rspec', stage: 'test', only: ['master'] },
+          prod: { script: 'cap prod', stage: 'deploy', only: ['tags'] } }
+      end
+
+      let(:pipeline) do
+        build(:ci_pipeline, ref: 'master', config: config)
+      end
 
-      expect(pipeline.stages.size).to eq 1
-      expect(pipeline.stages.first.builds.size).to eq 1
-      expect(pipeline.stages.first.builds.first.name).to eq 'rspec'
+      it_behaves_like 'a correct pipeline'
+
+      context 'when variables expression is specified' do
+        context 'when pipeline iid is the subject' do
+          let(:config) do
+            { rspec: { script: 'rspec', only: { variables: ["$CI_PIPELINE_IID == '1'"] } },
+              prod: { script: 'cap prod', only: { variables: ["$CI_PIPELINE_IID == '1000'"] } } }
+          end
+
+          it_behaves_like 'a correct pipeline'
+        end
+      end
     end
   end
 end
diff --git a/spec/lib/gitlab/import_export/safe_model_attributes.yml b/spec/lib/gitlab/import_export/safe_model_attributes.yml
index 74e7a45fd6ca5c8d215f6791d20c0a872739cfcb..2aebdc57f7cd5d73143dc3ce23d5a0cac0dc42f2 100644
--- a/spec/lib/gitlab/import_export/safe_model_attributes.yml
+++ b/spec/lib/gitlab/import_export/safe_model_attributes.yml
@@ -242,6 +242,7 @@ Ci::Pipeline:
 - config_source
 - failure_reason
 - protected
+- iid
 Ci::Stage:
 - id
 - name
diff --git a/spec/models/ci/build_spec.rb b/spec/models/ci/build_spec.rb
index b5eac913639e1b4ff8583e8c8229be7b5a81458e..66c9708b4cfa6b833111a07ff329114cecdbf02e 100644
--- a/spec/models/ci/build_spec.rb
+++ b/spec/models/ci/build_spec.rb
@@ -1559,6 +1559,7 @@ describe Ci::Build do
         { key: 'CI_PROJECT_NAMESPACE', value: project.namespace.full_path, public: true },
         { key: 'CI_PROJECT_URL', value: project.web_url, public: true },
         { key: 'CI_PROJECT_VISIBILITY', value: 'private', public: true },
+        { key: 'CI_PIPELINE_IID', value: pipeline.iid.to_s, public: true },
         { key: 'CI_CONFIG_PATH', value: pipeline.ci_yaml_file_path, public: true },
         { key: 'CI_PIPELINE_SOURCE', value: pipeline.source, public: true },
         { key: 'CI_COMMIT_MESSAGE', value: pipeline.git_commit_message, public: true },
diff --git a/spec/models/ci/pipeline_spec.rb b/spec/models/ci/pipeline_spec.rb
index f5295bec65b1ffc4d1f340875577b83e33caff49..24692ebb9a3b701ab6bf1c6024ec2c142d3504a4 100644
--- a/spec/models/ci/pipeline_spec.rb
+++ b/spec/models/ci/pipeline_spec.rb
@@ -35,6 +35,16 @@ describe Ci::Pipeline, :mailer do
     end
   end
 
+  describe 'modules' do
+    it_behaves_like 'AtomicInternalId', validate_presence: false do
+      let(:internal_id_attribute) { :iid }
+      let(:instance) { build(:ci_pipeline) }
+      let(:scope) { :project }
+      let(:scope_attrs) { { project: instance.project } }
+      let(:usage) { :ci_pipelines }
+    end
+  end
+
   describe '#source' do
     context 'when creating new pipeline' do
       let(:pipeline) do
@@ -195,7 +205,8 @@ describe Ci::Pipeline, :mailer do
     it 'includes all predefined variables in a valid order' do
       keys = subject.map { |variable| variable[:key] }
 
-      expect(keys).to eq %w[CI_CONFIG_PATH
+      expect(keys).to eq %w[CI_PIPELINE_IID
+                            CI_CONFIG_PATH
                             CI_PIPELINE_SOURCE
                             CI_COMMIT_MESSAGE
                             CI_COMMIT_TITLE
diff --git a/spec/models/deployment_spec.rb b/spec/models/deployment_spec.rb
index aee70bcfb29ba7eea067b0653a0c73a7df91f54f..e01906f4b6c44fe5e21bed6b4a0c21e5c1ea5cf4 100644
--- a/spec/models/deployment_spec.rb
+++ b/spec/models/deployment_spec.rb
@@ -20,6 +20,7 @@ describe Deployment do
     it_behaves_like 'AtomicInternalId' do
       let(:internal_id_attribute) { :iid }
       let(:instance) { build(:deployment) }
+      let(:scope) { :project }
       let(:scope_attrs) { { project: instance.project } }
       let(:usage) { :deployments }
     end
diff --git a/spec/models/issue_spec.rb b/spec/models/issue_spec.rb
index 128acf8368603d6e2fb9ea1f6f132c6f230314f8..e818fbeb9cfcfd4bee0b41f12a440314005aa600 100644
--- a/spec/models/issue_spec.rb
+++ b/spec/models/issue_spec.rb
@@ -17,6 +17,7 @@ describe Issue do
     it_behaves_like 'AtomicInternalId' do
       let(:internal_id_attribute) { :iid }
       let(:instance) { build(:issue) }
+      let(:scope) { :project }
       let(:scope_attrs) { { project: instance.project } }
       let(:usage) { :issues }
     end
diff --git a/spec/models/merge_request_spec.rb b/spec/models/merge_request_spec.rb
index 9ffa91fc265d86799f1d4f9a304e1968b552800d..65cc9372cbec9f4b6c6a20508f13aee85600ce43 100644
--- a/spec/models/merge_request_spec.rb
+++ b/spec/models/merge_request_spec.rb
@@ -84,6 +84,7 @@ describe MergeRequest do
     it_behaves_like 'AtomicInternalId' do
       let(:internal_id_attribute) { :iid }
       let(:instance) { build(:merge_request) }
+      let(:scope) { :target_project }
       let(:scope_attrs) { { project: instance.target_project } }
       let(:usage) { :merge_requests }
     end
diff --git a/spec/models/milestone_spec.rb b/spec/models/milestone_spec.rb
index 4bb9717d33eca3c7b4d5854739d02da8b12a2ee2..204d6b47832aca548f779c9a57e20cbc9aebab9a 100644
--- a/spec/models/milestone_spec.rb
+++ b/spec/models/milestone_spec.rb
@@ -6,6 +6,7 @@ describe Milestone do
       it_behaves_like 'AtomicInternalId' do
         let(:internal_id_attribute) { :iid }
         let(:instance) { build(:milestone, project: build(:project), group: nil) }
+        let(:scope) { :project }
         let(:scope_attrs) { { project: instance.project } }
         let(:usage) { :milestones }
       end
@@ -15,6 +16,7 @@ describe Milestone do
       it_behaves_like 'AtomicInternalId' do
         let(:internal_id_attribute) { :iid }
         let(:instance) { build(:milestone, project: nil, group: build(:group)) }
+        let(:scope) { :group }
         let(:scope_attrs) { { namespace: instance.group } }
         let(:usage) { :milestones }
       end
diff --git a/spec/support/shared_examples/models/atomic_internal_id_spec.rb b/spec/support/shared_examples/models/atomic_internal_id_spec.rb
index 6a6e13418a987a8f1d4f2b03d958344c7d65688d..7ab1041d17ce09b97055083264b087ee6a91ef34 100644
--- a/spec/support/shared_examples/models/atomic_internal_id_spec.rb
+++ b/spec/support/shared_examples/models/atomic_internal_id_spec.rb
@@ -1,6 +1,6 @@
 require 'spec_helper'
 
-shared_examples_for 'AtomicInternalId' do
+shared_examples_for 'AtomicInternalId' do |validate_presence: true|
   describe '.has_internal_id' do
     describe 'Module inclusion' do
       subject { described_class }
@@ -9,14 +9,31 @@ shared_examples_for 'AtomicInternalId' do
     end
 
     describe 'Validation' do
-      subject { instance }
-
       before do
-        allow(InternalId).to receive(:generate_next).and_return(nil)
+        allow_any_instance_of(described_class).to receive(:"ensure_#{scope}_#{internal_id_attribute}!")
+
+        instance.valid?
       end
 
-      it { is_expected.to validate_presence_of(internal_id_attribute) }
-      it { is_expected.to validate_numericality_of(internal_id_attribute) }
+      context 'when presence validation is required' do
+        before do
+          skip unless validate_presence
+        end
+
+        it 'validates presence' do
+          expect(instance.errors[internal_id_attribute]).to include("can't be blank")
+        end
+      end
+
+      context 'when presence validation is not required' do
+        before do
+          skip if validate_presence
+        end
+
+        it 'does not validate presence' do
+          expect(instance.errors[internal_id_attribute]).to be_empty
+        end
+      end
     end
 
     describe 'Creating an instance' do