too much for one commit

tests/EntKube.Identity.Tests/Domain/CustomerTests.cs

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+using EntKube.Identity.Domain;
+using FluentAssertions;
+
+namespace EntKube.Identity.Tests.Domain;
+
+public class CustomerTests
+{
+    [Fact]
+    public void Create_WithValidInputs_CreatesActiveCustomer()
+    {
+        // Arrange — A tenant admin onboards a new customer (team/organization)
+        // within their tenant. In the terraform reference, these are the "tenants"
+        // like capioDA, capioonline, volvat — each representing a team that gets
+        // its own namespaces, quotas, and app deployments per environment.
+
+        Guid tenantId = Guid.NewGuid();
+
+        // Act
+
+        Customer customer = Customer.Create(tenantId, "Capio Data Analytics", "capioda");
+
+        // Assert — The customer should be active and linked to its tenant.
+
+        customer.Id.Should().NotBe(Guid.Empty);
+        customer.TenantId.Should().Be(tenantId);
+        customer.Name.Should().Be("Capio Data Analytics");
+        customer.Slug.Should().Be("capioda");
+        customer.Status.Should().Be(CustomerStatus.Active);
+        customer.CreatedAt.Should().BeCloseTo(DateTimeOffset.UtcNow, TimeSpan.FromSeconds(5));
+    }
+
+    [Fact]
+    public void Create_NormalizesSlugToLowerCase()
+    {
+        // Arrange & Act — Slugs should be lowercase for consistent lookups.
+
+        Customer customer = Customer.Create(Guid.NewGuid(), "Volvat", "VOLVAT");
+
+        // Assert
+
+        customer.Slug.Should().Be("volvat");
+    }
+
+    [Fact]
+    public void Create_WithEmptyName_ThrowsArgumentException()
+    {
+        // Arrange & Act
+
+        Action act = () => Customer.Create(Guid.NewGuid(), "", "slug");
+
+        // Assert
+
+        act.Should().Throw<ArgumentException>()
+            .WithParameterName("name");
+    }
+
+    [Fact]
+    public void Create_WithEmptySlug_ThrowsArgumentException()
+    {
+        // Arrange & Act
+
+        Action act = () => Customer.Create(Guid.NewGuid(), "Some Customer", "");
+
+        // Assert
+
+        act.Should().Throw<ArgumentException>()
+            .WithParameterName("slug");
+    }
+
+    [Fact]
+    public void Create_WithEmptyTenantId_ThrowsArgumentException()
+    {
+        // Arrange & Act — Every customer must belong to a tenant.
+
+        Action act = () => Customer.Create(Guid.Empty, "Some Customer", "slug");
+
+        // Assert
+
+        act.Should().Throw<ArgumentException>()
+            .WithParameterName("tenantId");
+    }
+
+    [Fact]
+    public void Suspend_SetsStatusToSuspended()
+    {
+        // Arrange — An active customer that the admin wants to temporarily disable
+        // (e.g. during a billing dispute or compliance review).
+
+        Customer customer = Customer.Create(Guid.NewGuid(), "Volvat", "volvat");
+
+        // Act
+
+        customer.Suspend();
+
+        // Assert
+
+        customer.Status.Should().Be(CustomerStatus.Suspended);
+    }
+
+    [Fact]
+    public void Activate_SetsStatusToActive()
+    {
+        // Arrange — A previously suspended customer being re-enabled.
+
+        Customer customer = Customer.Create(Guid.NewGuid(), "Volvat", "volvat");
+        customer.Suspend();
+
+        // Act
+
+        customer.Activate();
+
+        // Assert
+
+        customer.Status.Should().Be(CustomerStatus.Active);
+    }
+}