1 files changed, 81 insertions, 0 deletions
diff --git a/spec/requests/api/graphql/mutations/notes/reposition_image_diff_note_spec.rb b/spec/requests/api/graphql/mutations/notes/reposition_image_diff_note_spec.rb
new file mode 100644
index 00000000000..4efa7f9d509
--- /dev/null
+++ b/spec/requests/api/graphql/mutations/notes/reposition_image_diff_note_spec.rb
@@ -0,0 +1,81 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe 'Repositioning an ImageDiffNote' do
+  include GraphqlHelpers
+
+  let_it_be(:noteable) { create(:merge_request) }
+  let_it_be(:project) { noteable.project }
+  let(:note) { create(:image_diff_note_on_merge_request, noteable: noteable, project: project) }
+  let(:new_position) { { x: 10 } }
+  let(:current_user) { project.creator }
+
+  let(:mutation_variables) do
+    {
+      id: global_id_of(note),
+      position: new_position
+    }
+  end
+
+  let(:mutation) do
+    graphql_mutation(:reposition_image_diff_note, mutation_variables) do
+      <<~QL
+        note {
+          id
+        }
+        errors
+      QL
+    end
+  end
+
+  def mutation_response
+    graphql_mutation_response(:reposition_image_diff_note)
+  end
+
+  it 'updates the note', :aggregate_failures do
+    expect do
+      post_graphql_mutation(mutation, current_user: current_user)
+    end.to change { note.reset.position.x }.to(10)
+
+    expect(mutation_response['note']).to eq('id' => global_id_of(note))
+    expect(mutation_response['errors']).to be_empty
+  end
+
+  context 'when the note is not a DiffNote' do
+    let(:note) { project }
+
+    it_behaves_like 'a mutation that returns top-level errors' do
+      let(:match_errors) { include(/does not represent an instance of DiffNote/) }
+    end
+  end
+
+  context 'when a position arg is nil' do
+    let(:new_position) { { x: nil, y: 10 } }
+
+    it 'does not set the property to nil', :aggregate_failures do
+      expect do
+        post_graphql_mutation(mutation, current_user: current_user)
+      end.not_to change { note.reset.position.x }
+
+      expect(mutation_response['note']).to eq('id' => global_id_of(note))
+      expect(mutation_response['errors']).to be_empty
+    end
+  end
+
+  context 'when all position args are nil' do
+    let(:new_position) { { x: nil } }
+
+    it_behaves_like 'a mutation that returns top-level errors' do
+      let(:match_errors) { include(/RepositionImageDiffNoteInput! was provided invalid value/) }
+    end
+
+    it 'contains an explanation for the error' do
+      post_graphql_mutation(mutation, current_user: current_user)
+
+      explanation = graphql_errors.first['extensions']['problems'].first['explanation']
+
+      expect(explanation).to eq('At least one property of `UpdateDiffImagePositionInput` must be set')
+    end
+  end
+end