diff --git a/backend/tests/GQL/Mutations/SetSummary.cs b/backend/tests/GQL/Mutations/SetSummary.cs
new file mode 100644
index 000000000..572472ce3
--- /dev/null
+++ b/backend/tests/GQL/Mutations/SetSummary.cs
@@ -0,0 +1,94 @@
+using Xunit;
+using System;
+using System.Linq;
+
+using api.Models;
+using api.Services;
+using api.GQL;
+
+
+namespace tests
+{
+    public class SetSummaryMutation: MutationTest
+    {
+        private readonly Evaluation _evaluation;
+        private readonly Participant _facilitator;
+        private readonly Participant _organizationLead;
+        private readonly Participant _participant;
+        private readonly Participant _readonly;
+
+        public SetSummaryMutation() {
+            _evaluation = CreateEvaluation();
+            _facilitator = _evaluation.Participants.First();
+            _authService.LoginUser(_facilitator);
+
+            _organizationLead = CreateParticipant(_evaluation, role: Role.OrganizationLead);
+            _participant = CreateParticipant(_evaluation, role: Role.Participant);
+            _readonly = CreateParticipant(_evaluation, role: Role.ReadOnly);
+        }
+
+        /* Tests */
+
+        [Fact]
+        public void FacilitatorCanUseMutation()
+        {
+            AssertCanSet(_facilitator);
+        }
+
+        [Fact]
+        public void OrganizationLeadIsUnauthorized()
+        {
+            AssertIsNotAuthorized(_organizationLead);
+        }
+
+        [Fact]
+        public void ParticipantIsUnauthorized()
+        {
+            AssertIsNotAuthorized(_participant);
+        }
+
+        [Fact]
+        public void ReadOnlyIsUnauthorized()
+        {
+            AssertIsNotAuthorized(_readonly);
+        }
+
+        [Fact]
+        public void NonParcipantIsUnauthorized()
+        {
+            string AzureUniqueId = Randomize.Integer().ToString();
+            AssertIsNotAuthorized(AzureUniqueId);
+        }
+
+        /* Helper methods */
+
+        private void AssertCanSet(Participant user)
+        {
+            _authService.LoginUser(user);
+
+            string summary = Randomize.String();
+            _mutation.SetSummary(
+                evaluationId: _evaluation.Id,
+                summary: summary
+            );
+
+            Assert.True(_evaluation.Summary == summary);
+        }
+
+        private void AssertIsNotAuthorized(string azureUniqueId)
+        {
+            _authService.LoginUser(azureUniqueId);
+            Assert.Throws<UnauthorizedAccessException>(() =>
+                _mutation.SetSummary(
+                    evaluationId: _evaluation.Id,
+                    summary: Randomize.String()
+                )
+            );
+        }
+
+        private void AssertIsNotAuthorized(Participant user)
+        {
+            AssertIsNotAuthorized(user.AzureUniqueId);
+        }
+    }
+}