1 files changed, 78 insertions, 0 deletions
diff --git a/spec/lib/gitlab/metrics/dashboard/validator/post_schema_validator_spec.rb b/spec/lib/gitlab/metrics/dashboard/validator/post_schema_validator_spec.rb
new file mode 100644
index 00000000000..e7cb1429ca9
--- /dev/null
+++ b/spec/lib/gitlab/metrics/dashboard/validator/post_schema_validator_spec.rb
@@ -0,0 +1,78 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe Gitlab::Metrics::Dashboard::Validator::PostSchemaValidator do
+  describe '#validate' do
+    context 'with no project and dashboard_path provided' do
+      context 'unique local metric_ids' do
+        it 'returns empty array' do
+          expect(described_class.new(metric_ids: [1, 2, 3]).validate).to eq([])
+        end
+      end
+
+      context 'duplicate local metrics_ids' do
+        it 'returns error' do
+          expect(described_class.new(metric_ids: [1, 1]).validate)
+            .to eq([Gitlab::Metrics::Dashboard::Validator::Errors::DuplicateMetricIds])
+        end
+      end
+    end
+
+    context 'with project and dashboard_path' do
+      let(:project) { create(:project) }
+
+      subject do
+        described_class.new(
+          project: project,
+          metric_ids: ['some_identifier'],
+          dashboard_path: 'test/path.yml'
+        ).validate
+      end
+
+      context 'with unique metric identifiers' do
+        before do
+          create(:prometheus_metric,
+            project: project,
+            identifier: 'some_other_identifier',
+            dashboard_path: 'test/path.yml'
+          )
+        end
+
+        it 'returns empty array' do
+          expect(subject).to eq([])
+        end
+      end
+
+      context 'duplicate metric identifiers in database' do
+        context 'with different dashboard_path' do
+          before do
+            create(:prometheus_metric,
+              project: project,
+              identifier: 'some_identifier',
+              dashboard_path: 'some/other/path.yml'
+            )
+          end
+
+          it 'returns error' do
+            expect(subject).to include(Gitlab::Metrics::Dashboard::Validator::Errors::DuplicateMetricIds)
+          end
+        end
+
+        context 'with same dashboard_path' do
+          before do
+            create(:prometheus_metric,
+              project: project,
+              identifier: 'some_identifier',
+              dashboard_path: 'test/path.yml'
+            )
+          end
+
+          it 'returns empty array' do
+            expect(subject).to eq([])
+          end
+        end
+      end
+    end
+  end
+end