feat: fixed relative address construction for manual HTTP client (#156)

* Fixed relative URI construction error in ApiUrls
* Added relative uri test

---------

Co-authored-by: Juan Santos <[email protected]>

src/Keycloak.AuthServices.Sdk/Admin/ApiUrls.cs

@@ -5,7 +5,7 @@ namespace Keycloak.AuthServices.Sdk.Admin;
 /// </summary>
 internal static class ApiUrls
 {
-    private const string AdminApiBase = "/admin";
+    private const string AdminApiBase = "admin";
 
     private const string RealmParam = "{realm}";
 

tests/Keycloak.AuthServices.Sdk.Tests/KeycloakClientRelativeAddressTests.cs

@@ -0,0 +1,32 @@
+namespace Keycloak.AuthServices.Sdk.Tests;
+
+using System.Net;
+using Admin;
+using RichardSzalay.MockHttp;
+
+public class KeycloakClientRelativeAddressTests
+{
+    private const string BaseAddress = "http://localhost:8080/identity/";
+    private const string MediaType = "application/json";
+    private readonly MockHttpMessageHandler handler = new();
+    private readonly IKeycloakRealmClient keycloakRealmClient;
+
+    public KeycloakClientRelativeAddressTests()
+    {
+        var httpClient = this.handler.ToHttpClient();
+        httpClient.BaseAddress = new Uri(BaseAddress);
+
+        this.keycloakRealmClient = new KeycloakClient(httpClient);
+    }
+
+    [Fact]
+    public async Task GetRealmShouldCallRealmRelativeEndpoint()
+    {
+        this.handler.Expect(HttpMethod.Get, "/identity/admin/realms/master")
+            .Respond(HttpStatusCode.OK, MediaType, "{}");
+
+        await this.keycloakRealmClient.GetRealmAsync("master");
+
+        this.handler.VerifyNoOutstandingExpectation();
+    }
+}