Add more unit tests

backend/internal/serverevents/sse_test.go

@@ -0,0 +1,20 @@
+package serverevents
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestGet(t *testing.T) {
+	s := Get()
+	assert.NotEqual(t, nil, s)
+}
+
+// This is just for code coverage more than anything
+func TestEverything(t *testing.T) {
+	Get()
+	SendMessage("test", "test", map[string]string{"user_id": "10"})
+	SendChange("hosts")
+	Shutdown()
+}