diff --git a/manager/controllers/template_subscribed_systems_update_test.go b/manager/controllers/template_subscribed_systems_update_test.go
new file mode 100644
index 000000000..23d18759f
--- /dev/null
+++ b/manager/controllers/template_subscribed_systems_update_test.go
@@ -0,0 +1,56 @@
+package controllers
+
+import (
+	"app/base/core"
+	"app/base/database"
+	"app/base/utils"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	"github.com/gin-gonic/gin"
+	"github.com/stretchr/testify/assert"
+)
+
+var subscriptionUUID = "cccccccc-0000-0000-0001-000000000004"
+var templateSystemUUID = "00000000-0000-0000-0000-000000000004"
+
+func TestSubscribedSystemID(t *testing.T) {
+	core.SetupTest(t)
+
+	c, _ := gin.CreateTestContext(httptest.NewRecorder())
+	c.Set(utils.KeyAccount, templateAccount)
+	c.Set(utils.KeySystem, subscriptionUUID)
+	account, systemID, err := getSubscribedSystem(c, database.DB)
+
+	assert.Nil(t, err)
+	assert.Equal(t, templateAccount, account)
+	assert.Equal(t, templateSystemUUID, systemID)
+}
+
+func TestUnknownSubscribedSystemID(t *testing.T) {
+	core.SetupTest(t)
+
+	c, _ := gin.CreateTestContext(httptest.NewRecorder())
+	c.Set(utils.KeyAccount, templateAccount)
+	c.Set(utils.KeySystem, "unknown-uuid")
+	account, systemID, err := getSubscribedSystem(c, database.DB)
+
+	assert.EqualError(t, err, "System unknown-uuid not found")
+	assert.Equal(t, 0, account)
+	assert.Equal(t, "", systemID)
+}
+
+func TestUpdateTemplateSubscribedSystems(t *testing.T) {
+	core.SetupTest(t)
+
+	database.CreateTemplate(t, templateAccount, templateUUID, nil)
+
+	w := CreateRequestRouterWithParams("PATCH", "/:template_id/subscribed-systems", templateUUID, "", nil, "",
+		TemplateSubscribedSystemsUpdateHandler, templateAccount,
+		core.ContextKV{Key: utils.KeySystem, Value: subscriptionUUID})
+
+	assert.Equal(t, http.StatusOK, w.Code)
+	database.CheckTemplateSystems(t, templateAccount, templateUUID, []string{templateSystemUUID})
+	database.DeleteTemplate(t, templateAccount, templateUUID)
+}