Write Test

Write Test

Guidelines and conventions for writing tests in the Stream Video Unity SDK.

When to Use

• When creating a new test file or test method
• When modifying existing tests
• When reviewing test code for convention compliance
• When asked to add test coverage for a feature

Project Structure

Tests live under Tests/ in three assemblies:

Never create new .asmdef files. Place your file in the correct existing folder.

Compilation Guard

Every test .cs file must be wrapped in:

#if STREAM_TESTS_ENABLED
// ... entire file contents ...
#endif

This is a master kill-switch that prevents test code from compiling in production builds.

Namespaces

• Editor tests: StreamVideo.Tests.Editor
• Runtime tests: StreamVideo.Tests.Runtime
• Shared utilities: StreamVideo.Tests.Shared

Class Conventions

• Mark test classes internal (optionally sealed for editor tests).
• Name classes {SubjectUnderTest}Tests — e.g. SessionIDTests, CallsTests.
• Add an XML doc <summary> comment on the class referencing the class under test via <see cref="..."/>.
• Store the subject-under-test or any per-test state as private fields at the bottom of the class.

Test Method Naming

All tests (editor and runtime) use the same pattern: When_<condition>_expect_<outcome> with underscores:

When_new_instance_expect_empty
When_regenerate_expect_version_increments
When_clear_expect_version_unchanged
When_two_clients_join_same_call_expect_no_errors
When_setting_call_custom_data_expect_custom_data_set
When_participant_pinned_expect_pinned_participants_changed_event_fired

For runtime tests that use the async bridge, the private async companion uses the same name with an _Async suffix:

When_two_clients_join_same_call_expect_no_errors_Async

Writing an Editor Test (no client connection)

1. Create {Feature}Tests.cs in Tests/Editor/.
2. Do not inherit from TestsBase.
3. Use [Test] attribute for synchronous tests.
4. Use [SetUp] for per-test initialization.
5. Use NUnit constraint-model assertions (Assert.That(...)) with descriptive failure messages.

Template

#if STREAM_TESTS_ENABLED
using NUnit.Framework;
using StreamVideo.Core.SomeNamespace;

namespace StreamVideo.Tests.Editor
{
    /// <summary>
    /// Tests for <see cref="MyFeature"/>.
    /// </summary>
    internal sealed class MyFeatureTests
    {
        [SetUp]
        public void SetUp()
        {
            _myFeature = new MyFeature();
        }

        [Test]
        public void When_default_state_expect_some_property_has_expected_value()
        {
            Assert.That(_myFeature.SomeProperty, Is.EqualTo(expectedValue),
                "Descriptive failure message explaining what went wrong.");
        }

        private MyFeature _myFeature;
    }
}
#endif

Writing a Runtime Test (needs client connection)

1. Create {Feature}Tests.cs in Tests/Runtime/.
2. Inherit from TestsBase.
3. Use [UnityTest] attribute (returns IEnumerator).
4. Delegate to ConnectAndExecute(...) which handles client provisioning, connection, and retry-on-rate-limit.
5. Write the actual logic in a private async Task method with the _Async suffix.
6. Choose the right ConnectAndExecute overload:
   • ConnectAndExecute(SingleClientTestHandler) — one ITestClient
   • ConnectAndExecute(TwoClientsTestHandler) — two ITestClient params
   • ConnectAndExecute(Func<Task>) — no client params (connection still happens)

Template

#if STREAM_TESTS_ENABLED
using System.Collections;
using System.Threading.Tasks;
using NUnit.Framework;
using StreamVideo.Tests.Shared;
using UnityEngine.TestTools;

namespace StreamVideo.Tests.Runtime
{
    /// <summary>
    /// Tests for <see cref="SomeFeature"/>.
    /// </summary>
    internal class SomeFeatureTests : TestsBase
    {
        [UnityTest]
        public IEnumerator When_doing_X_expect_Y()
            => ConnectAndExecute(When_doing_X_expect_Y_Async);

        private async Task When_doing_X_expect_Y_Async(ITestClient client)
        {
            var call = await client.JoinRandomCallAsync();

            // ... test logic ...

            await WaitForConditionAsync(() => /* condition to poll */);
            Assert.AreEqual(expected, actual);
        }
    }
}
#endif

The Async-to-Coroutine Bridge

Unity's [UnityTest] requires IEnumerator, but test logic is async Task. The bridge works like this:

[UnityTest] public IEnumerator MethodName()
    => ConnectAndExecute(MethodName_Async);

ConnectAndExecute internally calls RunAsIEnumerator() (from TestUtils) which polls task.IsCompleted each frame and rethrows faults. You never need to call RunAsIEnumerator() directly in a runtime test that uses ConnectAndExecute.

For editor tests that are async but don't need a client, use the Execute(...) helper:

[UnityTest]
public IEnumerator My_async_editor_test()
    => Execute(My_async_editor_test_Async);

Or call RunAsIEnumerator() directly on the task:

[UnityTest]
public IEnumerator My_async_editor_test()
    => My_async_editor_test_Async().RunAsIEnumerator();

Key Shared Utilities

Conditional Ignore for Camera Tests

If a test requires a camera device, add the conditional ignore attribute:

[UnityTest, ConditionalIgnore(IgnoreConditionNoCameraKey, IgnoreConditionNoCameraReason)]
public IEnumerator When_client_joins_call_with_video_expect_receiving_video_track()
    => ConnectAndExecute(When_client_joins_call_with_video_expect_receiving_video_track_Async,
        ignoreFailingMessages: true);

These constants are defined in TestsBase.

Golden Rules

1. Always wrap files in #if STREAM_TESTS_ENABLED / #endif.
2. Never create a new .asmdef — use the existing Tests/Editor/ or Tests/Runtime/ folder.
3. Inherit TestsBase for runtime tests; don't for pure-logic editor tests.
4. Follow the naming pattern: When_<condition>_expect_<outcome> for all tests (editor and runtime).
5. Use the async-bridge pattern: public [UnityTest] → IEnumerator → ConnectAndExecute → private async Task with _Async suffix.
6. Add descriptive assertion messages to every assertion.
7. Don't manage client lifecycle manually — let TestsBase and StreamTestClientProvider handle it.
8. Use WaitForConditionAsync instead of Task.Delay for polling asynchronous state.
9. Track disposable assets via DisposableAssetsProvider.
10. Keep test classes internal — tests are not public API.
11. Add <summary> XML doc comments on the class with <see cref="..."/> to the subject under test.
12. Place shared helpers in Tests/Shared/ — never duplicate utilities across Editor and Runtime.