cleanup/small refactor + first tests

Backend/helper/system_test.go

@@ -0,0 +1,53 @@
+package helper
+
+import (
+	"os"
+	"testing"
+	"time"
+)
+
+func TestGetEnv(t *testing.T) {
+	os.Setenv("GO_TEST_VALUE", "123")
+	env := GetEnv("GO_TEST_VALUE", "")
+	if env != "123" {
+		t.Error("GetEnv() cannot find value")
+	}
+}
+
+func TestGetEnvEmpty(t *testing.T) {
+	env := GetEnv("GO_TEST_NOVALUE", "123")
+	if env != "123" {
+		t.Errorf("GetEnv() did not use default value: want=%s got=%s", "123", env)
+	}
+}
+
+func TestCacheCreate(t *testing.T) {
+	cacheFetch := func(key string) (any, error) {
+		return "123", nil
+	}
+
+	cache := NewCache(1*time.Second, cacheFetch)
+	if cache.ttl != 1*time.Second {
+		t.Error("Error creating cache")
+	}
+}
+
+func TestCacheFunction(t *testing.T) {
+	counter := 1
+	cacheFetch := func(key string) (any, error) {
+		counter += 1
+		return counter, nil
+	}
+
+	cache := NewCache(1*time.Millisecond, cacheFetch)
+	valInit, err := cache.Get("TEST")
+	valCache, err := cache.Get("TEST")
+	time.Sleep(1 * time.Millisecond)
+	valNoCache, err := cache.Get("TEST")
+	if err != nil {
+		t.Errorf("Error getting key from Cache: %e", err)
+	}
+	if valInit != valCache || valCache != 2 || valNoCache != 3 {
+		t.Error("Caching does not resprect ttl.")
+	}
+}