diff --git a/spec/lib/elastic/indexer_spec.rb b/spec/lib/elastic/indexer_spec.rb
new file mode 100644
index 0000000000000000000000000000000000000000..6227a2bda8b9b46ba8d12a9efc362f93795af8cc
--- /dev/null
+++ b/spec/lib/elastic/indexer_spec.rb
@@ -0,0 +1,21 @@
+require 'spec_helper'
+
+describe "Indexer" do
+  it "runs commands" do
+    expect(Gitlab::Popen).to receive(:popen).with(
+      array_including('bin/elastic_repo_indexer', '1', 'full_repo_path'),
+      nil,
+      hash_including(
+        'ELASTIC_CONNECTION_INFO' => {
+                                       host: Gitlab.config.elasticsearch.host,
+                                       port: Gitlab.config.elasticsearch.port
+                                     }.to_json,
+        'RAILS_ENV'               => Rails.env,
+        'FROM_SHA' => '000000',
+        'TO_SHA' => '1d1f2d'
+      )
+    ).and_return([[''], 0])
+
+    Elastic::Indexer.new.run(1, 'full_repo_path', '000000', '1d1f2d')
+  end
+end