2 files changed, 45 insertions, 0 deletions
diff --git a/middleware/kubernetes/util/util.go b/middleware/kubernetes/util/util.go
new file mode 100644
index 000000000..7fc03ffc1
--- /dev/null
+++ b/middleware/kubernetes/util/util.go
@@ -0,0 +1,12 @@
+// Package kubernetes/util provides helper functions for the kubernetes middleware
+package util
+
+// StringInSlice check whether string a is a member of slice.
+func StringInSlice(a string, slice []string) bool {
+	for _, b := range slice {
+		if b == a {
+			return true
+		}
+	}
+	return false
+}
diff --git a/middleware/kubernetes/util/util_test.go b/middleware/kubernetes/util/util_test.go
new file mode 100644
index 000000000..b53b9f3f6
--- /dev/null
+++ b/middleware/kubernetes/util/util_test.go
@@ -0,0 +1,33 @@
+package util
+
+import (
+	"testing"
+)
+
+type InSliceData struct {
+	Slice   []string
+	String  string
+	InSlice bool
+}
+
+// Test data for TestStringInSlice cases.
+var testdataInSlice = []struct {
+	Slice          []string
+	String         string
+	ExpectedResult bool
+}{
+	{[]string{"a", "b", "c"}, "a", true},
+	{[]string{"a", "b", "c"}, "d", false},
+	{[]string{"a", "b", "c"}, "", false},
+	{[]string{}, "a", false},
+	{[]string{}, "", false},
+}
+
+func TestStringInSlice(t *testing.T) {
+	for _, example := range testdataInSlice {
+		actualResult := StringInSlice(example.String, example.Slice)
+		if actualResult != example.ExpectedResult {
+			t.Errorf("Expected stringInSlice result '%v' for example string='%v', slice='%v'. Instead got result '%v'.", example.ExpectedResult, example.String, example.Slice, actualResult)
+		}
+	}
+}