1 files changed, 41 insertions, 0 deletions
diff --git a/spec/lib/bulk_imports/clients/graphql_spec.rb b/spec/lib/bulk_imports/clients/graphql_spec.rb
new file mode 100644
index 00000000000..2f212458c4a
--- /dev/null
+++ b/spec/lib/bulk_imports/clients/graphql_spec.rb
@@ -0,0 +1,41 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe BulkImports::Clients::Graphql do
+  let_it_be(:config) { create(:bulk_import_configuration) }
+
+  subject { described_class.new(url: config.url, token: config.access_token) }
+
+  describe '#execute' do
+    let(:query) { '{ metadata { version } }' }
+    let(:graphql_client_double) { double }
+    let(:response_double) { double }
+
+    before do
+      stub_const('BulkImports::MINIMUM_COMPATIBLE_MAJOR_VERSION', version)
+      allow(graphql_client_double).to receive(:execute)
+      allow(subject).to receive(:client).and_return(graphql_client_double)
+      allow(graphql_client_double).to receive(:execute).with(query).and_return(response_double)
+      allow(response_double).to receive_message_chain(:data, :metadata, :version).and_return(version)
+    end
+
+    context 'when source instance is compatible' do
+      let(:version) { '14.0.0' }
+
+      it 'marks source instance as compatible' do
+        subject.execute('test')
+
+        expect(subject.instance_variable_get(:@compatible_instance_version)).to eq(true)
+      end
+    end
+
+    context 'when source instance is incompatible' do
+      let(:version) { '13.0.0' }
+
+      it 'raises an error' do
+        expect { subject.execute('test') }.to raise_error(::BulkImports::Error, "Unsupported GitLab Version. Minimum Supported Gitlab Version #{BulkImport::MINIMUM_GITLAB_MAJOR_VERSION}.")
+      end
+    end
+  end
+end