Add labels builder tests

internal/controller/factory/labels_builder_test.go

@@ -0,0 +1,40 @@
+package factory
+
+import (
+	. "github.com/onsi/ginkgo/v2"
+	. "github.com/onsi/gomega"
+)
+
+var _ = Describe("Labels builder", func() {
+	Context("When ensuring a labels builder", func() {
+		It("constructor returns empty initialized map", func() {
+			builder := NewLabelsBuilder()
+			Expect(builder).To(Equal(make(LabelsBuilder)))
+		})
+		It("WithName sets correct key and value", func() {
+			builder := NewLabelsBuilder()
+			builder.WithName()
+			Expect(builder["app.kubernetes.io/name"]).To(Equal("etcd"))
+		})
+		It("WithManagedBy sets correct key and value", func() {
+			builder := NewLabelsBuilder()
+			builder.WithManagedBy()
+			Expect(builder["app.kubernetes.io/managed-by"]).To(Equal("etcd-operator"))
+		})
+		It("WithInstance sets correct key and value", func() {
+			builder := NewLabelsBuilder()
+			builder.WithInstance("local")
+			Expect(builder["app.kubernetes.io/instance"]).To(Equal("local"))
+		})
+		It("Chaining methods builds correct map", func() {
+			builder := NewLabelsBuilder()
+			builder.WithName().WithManagedBy().WithInstance("local")
+			expected := map[string]string{
+				"app.kubernetes.io/name":       "etcd",
+				"app.kubernetes.io/instance":   "local",
+				"app.kubernetes.io/managed-by": "etcd-operator",
+			}
+			Expect(builder).To(Equal(LabelsBuilder(expected)))
+		})
+	})
+})