Add comprehensive tests for Sites.Site schema

- Test valid changesets with required and all fields
- Test validation for name, description, location lengths
- Test parent site relationships and circular reference validation
- Test all constraint validations

test/towerops/sites/site_test.exs

@@ -0,0 +1,154 @@
+defmodule Towerops.Sites.SiteTest do
+  use Towerops.DataCase
+
+  import Towerops.AccountsFixtures
+  import Towerops.OrganizationsFixtures
+
+  alias Towerops.Sites.Site
+
+  describe "changeset/2" do
+    setup do
+      user = user_fixture()
+      organization = organization_fixture(user.id)
+      %{organization: organization}
+    end
+
+    test "valid changeset with required fields", %{organization: organization} do
+      changeset =
+        Site.changeset(%Site{}, %{
+          name: "Test Site",
+          organization_id: organization.id
+        })
+
+      assert changeset.valid?
+    end
+
+    test "valid changeset with all fields", %{organization: organization} do
+      changeset =
+        Site.changeset(%Site{}, %{
+          name: "Test Site",
+          description: "A test site",
+          location: "123 Main St",
+          organization_id: organization.id
+        })
+
+      assert changeset.valid?
+    end
+
+    test "invalid changeset without name", %{organization: organization} do
+      changeset =
+        Site.changeset(%Site{}, %{
+          organization_id: organization.id
+        })
+
+      refute changeset.valid?
+      assert "can't be blank" in errors_on(changeset).name
+    end
+
+    test "invalid changeset without organization_id" do
+      changeset =
+        Site.changeset(%Site{}, %{
+          name: "Test Site"
+        })
+
+      refute changeset.valid?
+      assert "can't be blank" in errors_on(changeset).organization_id
+    end
+
+    test "invalid changeset with short name", %{organization: organization} do
+      changeset =
+        Site.changeset(%Site{}, %{
+          name: "A",
+          organization_id: organization.id
+        })
+
+      refute changeset.valid?
+      assert "should be at least 2 character(s)" in errors_on(changeset).name
+    end
+
+    test "invalid changeset with long name", %{organization: organization} do
+      long_name = String.duplicate("a", 201)
+
+      changeset =
+        Site.changeset(%Site{}, %{
+          name: long_name,
+          organization_id: organization.id
+        })
+
+      refute changeset.valid?
+      assert "should be at most 200 character(s)" in errors_on(changeset).name
+    end
+
+    test "invalid changeset with long description", %{organization: organization} do
+      long_description = String.duplicate("a", 1001)
+
+      changeset =
+        Site.changeset(%Site{}, %{
+          name: "Test Site",
+          description: long_description,
+          organization_id: organization.id
+        })
+
+      refute changeset.valid?
+      assert "should be at most 1000 character(s)" in errors_on(changeset).description
+    end
+
+    test "invalid changeset with long location", %{organization: organization} do
+      long_location = String.duplicate("a", 201)
+
+      changeset =
+        Site.changeset(%Site{}, %{
+          name: "Test Site",
+          location: long_location,
+          organization_id: organization.id
+        })
+
+      refute changeset.valid?
+      assert "should be at most 200 character(s)" in errors_on(changeset).location
+    end
+
+    test "valid changeset with parent site", %{organization: organization} do
+      {:ok, parent_site} =
+        Towerops.Sites.create_site(%{
+          name: "Parent Site",
+          organization_id: organization.id
+        })
+
+      changeset =
+        Site.changeset(%Site{}, %{
+          name: "Child Site",
+          organization_id: organization.id,
+          parent_site_id: parent_site.id
+        })
+
+      assert changeset.valid?
+    end
+
+    test "invalid changeset with circular parent reference", %{organization: organization} do
+      {:ok, site} =
+        Towerops.Sites.create_site(%{
+          name: "Test Site",
+          organization_id: organization.id
+        })
+
+      changeset =
+        Site.changeset(site, %{
+          parent_site_id: site.id
+        })
+
+      refute changeset.valid?
+      assert "cannot be the same as the site itself" in errors_on(changeset).parent_site_id
+    end
+
+    test "changeset allows nil parent_site_id", %{organization: organization} do
+      changeset =
+        Site.changeset(%Site{}, %{
+          name: "Test Site",
+          organization_id: organization.id,
+          parent_site_id: nil
+        })
+
+      assert changeset.valid?
+    end
+  end
+end