1 files changed, 67 insertions, 0 deletions
diff --git a/spec/components/diffs/stats_component_spec.rb b/spec/components/diffs/stats_component_spec.rb
new file mode 100644
index 00000000000..2e5a5f2ca26
--- /dev/null
+++ b/spec/components/diffs/stats_component_spec.rb
@@ -0,0 +1,67 @@
+# frozen_string_literal: true
+
+require "spec_helper"
+
+RSpec.describe Diffs::StatsComponent, type: :component do
+  include RepoHelpers
+
+  subject(:component) do
+    described_class.new(diff_files: diff_files)
+  end
+
+  let_it_be(:project) { create(:project, :repository) }
+  let_it_be(:repository) { project.repository }
+  let_it_be(:commit) { project.commit(sample_commit.id) }
+  let_it_be(:diffs) { commit.raw_diffs }
+  let_it_be(:diff) { diffs.first }
+  let_it_be(:diff_refs) { commit.diff_refs }
+  let_it_be(:diff_file) { Gitlab::Diff::File.new(diff, diff_refs: diff_refs, repository: repository) }
+  let_it_be(:diff_files) { [diff_file] }
+
+  describe "rendered component" do
+    subject { rendered_component }
+
+    let(:element) { page.find(".js-diff-stats-dropdown") }
+
+    before do
+      render_inline component
+    end
+
+    it { is_expected.to have_selector(".js-diff-stats-dropdown") }
+
+    it "renders the data attributes" do
+      expect(element["data-changed"]).to eq("1")
+      expect(element["data-added"]).to eq("10")
+      expect(element["data-deleted"]).to eq("3")
+
+      expect(Gitlab::Json.parse(element["data-files"])).to eq([{
+        "href" => "##{Digest::SHA1.hexdigest(diff_file.file_path)}",
+        "title" => diff_file.new_path,
+        "name" => diff_file.file_path,
+        "path" => diff_file.file_path,
+        "icon" => "file-modified",
+        "iconColor" => "",
+        "added" => diff_file.added_lines,
+        "removed" => diff_file.removed_lines
+      }])
+    end
+  end
+
+  describe "#diff_file_path_text" do
+    it "returns full path by default" do
+      expect(subject.diff_file_path_text(diff_file)).to eq(diff_file.new_path)
+    end
+
+    it "returns truncated path" do
+      expect(subject.diff_file_path_text(diff_file, max: 10)).to eq("...open.rb")
+    end
+
+    it "returns the path if max is oddly small" do
+      expect(subject.diff_file_path_text(diff_file, max: 3)).to eq(diff_file.new_path)
+    end
+
+    it "returns the path if max is oddly large" do
+      expect(subject.diff_file_path_text(diff_file, max: 100)).to eq(diff_file.new_path)
+    end
+  end
+end