refactor internal/helper/image_unit_test : use table driven tests

Unit tests were spread across various functions, but most of them
can be organized into table driven test cases.

golang/internal/helper/image/image_unit_test.go

@@ -13,35 +13,50 @@ import (
 	"github.com/dyrector-io/dyrectorio/protobuf/go/agent"
 )
 
-func TestRegistryUrl(t *testing.T) {
-	auth := &imageHelper.RegistryAuth{
-		URL: "test",
-	}
-
-	url := imageHelper.GetRegistryURL(nil, auth)
-	assert.Equal(t, url, "test")
+type RegistryTestCase struct {
+	Registry    *string
+	RegistryUrl *string
+	ExpectedUrl string
 }
 
-func TestRegistryUrlPriority(t *testing.T) {
-	registry := "other"
-	auth := &imageHelper.RegistryAuth{
-		URL: "test",
-	}
-
-	url := imageHelper.GetRegistryURL(&registry, auth)
-	assert.Equal(t, url, "test")
+func NewPTR[T any](value T) *T {
+	return &value
 }
 
-func TestRegistryUrlRegistry(t *testing.T) {
-	registry := "other"
-
-	url := imageHelper.GetRegistryURL(&registry, nil)
-	assert.Equal(t, url, "other")
-}
+func TestRegistryWithTable(t *testing.T) {
+	testCases := []RegistryTestCase{
+		{
+			Registry:    NewPTR[string](""),
+			RegistryUrl: NewPTR[string]("test"),
+			ExpectedUrl: "test",
+		},
+		{
+			Registry:    NewPTR[string]("other"),
+			RegistryUrl: NewPTR[string]("test"),
+			ExpectedUrl: "test",
+		},
+		{
+			Registry:    nil,
+			RegistryUrl: nil,
+			ExpectedUrl: "",
+		},
+		{
+			Registry:    NewPTR[string]("other"),
+			RegistryUrl: nil,
+			ExpectedUrl: "other",
+		},
+	}
 
-func TestRegistryUrlEmpty(t *testing.T) {
-	url := imageHelper.GetRegistryURL(nil, nil)
-	assert.Equal(t, url, "")
+	for _, tC := range testCases {
+		if tC.RegistryUrl == nil {
+			url := imageHelper.GetRegistryURL(tC.Registry, nil)
+			assert.Equal(t, url, tC.ExpectedUrl)
+		} else {
+			auth := &imageHelper.RegistryAuth{URL: *tC.RegistryUrl}
+			url := imageHelper.GetRegistryURL(tC.Registry, auth)
+			assert.Equal(t, url, tC.ExpectedUrl)
+		}
+	}
 }
 
 func TestProtoRegistryUrl(t *testing.T) {