Add MicCheck.Client library with FeatureClient.IsEnabledAsync

Client-side SDK for checking feature flag state against the flags API, with unit tests mocking HttpMessageHandler.
2026-07-09 12:48:21 -07:00
parent 8262cd2f61
commit 3eebef56a0
7 changed files with 184 additions and 0 deletions
@@ -0,0 +1,79 @@
+using System.Net;
+using System.Text;
+using Moq;
+using Moq.Protected;
+using NUnit.Framework;
+
+namespace MicCheck.Client.Tests.Unit;
+
+[TestFixture]
+public class FeatureClientTests
+{
+    [Test]
+    public async Task WhenFeatureIsEnabled_ThenIsEnabledAsyncReturnsTrue()
+    {
+        var client = CreateClient(HttpStatusCode.OK, """
+            [{"id":1,"feature":{"id":1,"name":"my-feature","type":"STANDARD"},"enabled":true,"featureStateValue":null}]
+            """);
+
+        var result = await client.IsEnabledAsync("my-feature");
+
+        Assert.That(result, Is.True);
+    }
+
+    [Test]
+    public async Task WhenFeatureIsDisabled_ThenIsEnabledAsyncReturnsFalse()
+    {
+        var client = CreateClient(HttpStatusCode.OK, """
+            [{"id":1,"feature":{"id":1,"name":"my-feature","type":"STANDARD"},"enabled":false,"featureStateValue":null}]
+            """);
+
+        var result = await client.IsEnabledAsync("my-feature");
+
+        Assert.That(result, Is.False);
+    }
+
+    [Test]
+    public async Task WhenFeatureNameDiffersOnlyByCase_ThenIsEnabledAsyncStillMatches()
+    {
+        var client = CreateClient(HttpStatusCode.OK, """
+            [{"id":1,"feature":{"id":1,"name":"My-Feature","type":"STANDARD"},"enabled":true,"featureStateValue":null}]
+            """);
+
+        var result = await client.IsEnabledAsync("my-feature");
+
+        Assert.That(result, Is.True);
+    }
+
+    [Test]
+    public async Task WhenFeatureIsNotFound_ThenIsEnabledAsyncReturnsProvidedDefaultValue()
+    {
+        var client = CreateClient(HttpStatusCode.OK, "[]");
+
+        var result = await client.IsEnabledAsync("missing-feature", defaultValue: true);
+
+        Assert.That(result, Is.True);
+    }
+
+    [Test]
+    public void WhenFeatureNameIsEmpty_ThenIsEnabledAsyncThrowsArgumentException()
+    {
+        var client = CreateClient(HttpStatusCode.OK, "[]");
+
+        Assert.That(async () => await client.IsEnabledAsync(" "), Throws.ArgumentException);
+    }
+
+    private static FeatureClient CreateClient(HttpStatusCode responseStatus, string responseBody)
+    {
+        var handler = new Mock<HttpMessageHandler>();
+        handler.Protected()
+            .Setup<Task<HttpResponseMessage>>("SendAsync", ItExpr.IsAny<HttpRequestMessage>(), ItExpr.IsAny<CancellationToken>())
+            .ReturnsAsync(new HttpResponseMessage(responseStatus)
+            {
+                Content = new StringContent(responseBody, Encoding.UTF8, "application/json")
+            });
+
+        var httpClient = new HttpClient(handler.Object) { BaseAddress = new Uri("https://example.com") };
+        return new FeatureClient(httpClient);
+    }
+}