1 files changed, 27 insertions, 4 deletions

diff --git a/spec/requests/api/graphql/mutations/issues/set_due_date_spec.rb b/spec/requests/api/graphql/mutations/issues/set_due_date_spec.rb
index b3c9b9d4995..ea5be9f9852 100644
--- a/spec/requests/api/graphql/mutations/issues/set_due_date_spec.rb
+++ b/spec/requests/api/graphql/mutations/issues/set_due_date_spec.rb
@@ -42,11 +42,34 @@ RSpec.describe 'Setting Due Date of an issue' do
     expect(graphql_errors).to include(a_hash_including('message' => error))
   end
 
-  it 'updates the issue due date' do
-    post_graphql_mutation(mutation, current_user: current_user)
+  context 'when due date value is a valid date' do
+    it 'updates the issue due date' do
+      post_graphql_mutation(mutation, current_user: current_user)
+
+      expect(response).to have_gitlab_http_status(:success)
+      expect(mutation_response['issue']['dueDate']).to eq(2.days.since.to_date.to_s)
+    end
+  end
+
+  context 'when due date value is null' do
+    let(:input) { { due_date: nil } }
+
+    it 'updates the issue to remove the due date' do
+      post_graphql_mutation(mutation, current_user: current_user)
 
-    expect(response).to have_gitlab_http_status(:success)
-    expect(mutation_response['issue']['dueDate']).to eq(2.days.since.to_date.to_s)
+      expect(response).to have_gitlab_http_status(:success)
+      expect(mutation_response['issue']['dueDate']).to be nil
+    end
+  end
+
+  context 'when due date argument is not given' do
+    let(:input) { {} }
+
+    it 'returns an error' do
+      post_graphql_mutation(mutation, current_user: current_user)
+
+      expect(graphql_errors).to include(a_hash_including('message' => /Argument dueDate must be provided/))
+    end
   end
 
   context 'when the due date value is not a valid time' do