Forgot to add test file

pkg/serving/service_test.go

@@ -0,0 +1,53 @@
+// Copyright © 2018 The Knative Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package serving
+
+import (
+	"math/rand"
+	"testing"
+
+	"gotest.tools/assert"
+
+	servingv1alpha1 "github.com/knative/serving/pkg/apis/serving/v1alpha1"
+)
+
+type generateNameTest struct {
+	templ  string
+	result string
+	err    string
+}
+
+func TestGenerateName(t *testing.T) {
+	rand.Seed(1)
+	someRandomChars := (&revisionTemplContext{}).Random(20)
+	service := &servingv1alpha1.Service{}
+	service.Name = "foo"
+	service.Generation = 3
+	cases := []generateNameTest{
+		{"{{.Service}}-v-{{.Generation}}", "foo-v-4", ""},
+		{"foo-asdf", "foo-asdf", ""},
+		{"{{.Bad}}", "", "can't evaluate field Bad"},
+		{"{{.Service}}-{{.Random 5}}", "foo-" + someRandomChars[0:5], ""},
+	}
+	for _, c := range cases {
+		rand.Seed(1)
+		name, err := GenerateRevisionName(c.templ, service)
+		if c.err != "" {
+			assert.ErrorContains(t, err, c.err)
+		} else {
+			assert.Equal(t, name, c.result)
+		}
+	}
+}