add unit-test for K8sNameHash

On-behalf-of: SAP <[email protected]>
Signed-off-by: Simon Bein <[email protected]>

Author: SimonTheLeg

pkg/controller/utils_test.go

@@ -0,0 +1,50 @@
+package controller
+
+import (
+	"fmt"
+	"testing"
+
+	"k8s.io/apimachinery/pkg/util/validation"
+)
+
+func TestK8sNameHash(t *testing.T) {
+	tt := []struct {
+		input   []string
+		expHash string
+	}{
+		{
+			[]string{"test1"},
+			"wrckybtbh7enmn4vx2nnbpvpkuarsnvm",
+		},
+		{
+			// check that the same string produces the same hash
+			[]string{"test1"},
+			"wrckybtbh7enmn4vx2nnbpvpkuarsnvm",
+		},
+		{
+			[]string{"bla"},
+			"76tha37scj5hjglta4tvn6b4kmxeh3ic",
+		},
+		{
+			[]string{"some other test", "this is a very, very long string"},
+			"fkkzqgh27xym6tqbswyql3wy4atsf6pt",
+		},
+	}
+
+	for _, tc := range tt {
+		t.Run(fmt.Sprint(tc.input), func(t *testing.T) {
+			res := K8sNameHash(tc.input...)
+
+			if res != tc.expHash {
+				t.Errorf("exp hash %q, got %q", tc.expHash, res)
+			}
+
+			// ensure the result is a valid DNS1123Subdomain
+			if errs := validation.IsDNS1123Subdomain(res); errs != nil {
+				t.Errorf("value %q is invalid: %v", res, errs)
+			}
+
+		})
+	}
+
+}