1 files changed, 27 insertions, 0 deletions
diff --git a/spec/graphql/types/diff_type_spec.rb b/spec/graphql/types/diff_type_spec.rb
new file mode 100644
index 00000000000..04f4ff9feed
--- /dev/null
+++ b/spec/graphql/types/diff_type_spec.rb
@@ -0,0 +1,27 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe GitlabSchema.types['Diff'], feature_category: :code_review_workflow do
+  include RepoHelpers
+  include GraphqlHelpers
+
+  specify { expect(described_class.graphql_name).to eq('Diff') }
+
+  it 'contains attributes related to diff' do
+    expect(described_class).to have_graphql_fields(
+      :a_mode, :b_mode, :deleted_file, :diff, :new_file, :new_path, :old_path, :renamed_file
+    )
+  end
+
+  describe '#diff' do
+    subject { resolve_field(:diff, diff, object_type: described_class) }
+
+    let(:merge_request_diff) { create(:merge_request).merge_request_diff }
+    let(:diff) { merge_request_diff.diffs.diffs.first }
+
+    it 'returns the diff of the passed commit' do
+      is_expected.to eq(diff.diff)
+    end
+  end
+end