add test for config checker (stolostron#429)

Signed-off-by: xuezhaojun <[email protected]>

cmd/agent/app/server_test.go

@@ -0,0 +1,58 @@
+package app
+
+import (
+	"context"
+	"net/http"
+	"os"
+	"testing"
+	"time"
+
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+
+	addonutils "open-cluster-management.io/addon-framework/pkg/utils"
+)
+
+func TestServer(t *testing.T) {
+	RegisterFailHandler(Fail)
+	RunSpecs(t, "Server Suite")
+}
+
+var tmpFileName string
+
+var _ = BeforeSuite(func() {
+	tmpFile, err := os.CreateTemp("/tmp", "test")
+	Expect(err).To(BeNil())
+
+	tmpFileName = tmpFile.Name()
+
+	cc, err := addonutils.NewConfigChecker("test", tmpFileName)
+	Expect(err).To(BeNil())
+
+	go ServeHealthProbes(context.Background().Done(), ":8000", cc.Check)
+})
+
+var _ = Describe("Config changed", func() {
+	BeforeEach(func() {
+		// pre check
+		resp, err := http.Get("http://localhost:8000/healthz")
+		Expect(err).To(BeNil())
+		Expect(resp.StatusCode).To(Equal(http.StatusOK))
+
+		// change the config
+		err = os.WriteFile(tmpFileName, []byte("changed content"), os.ModeAppend)
+		Expect(err).To(BeNil())
+	})
+	It("should return false", func() {
+		// check
+		resp, err := http.Get("http://localhost:8000/healthz")
+		Expect(err).To(BeNil())
+		Expect(resp.StatusCode).To(Equal(http.StatusInternalServerError))
+
+		time.Sleep(3 * time.Second)
+		// check again
+		resp, err = http.Get("http://localhost:8000/healthz")
+		Expect(err).To(BeNil())
+		Expect(resp.StatusCode).To(Equal(http.StatusInternalServerError))
+	})
+})