feat(bdd): adding snapshot and clone releated test cases

added snapshot and clone related test cases. Also restructure
the BDD framework to loop through the supported fstypes and perfrom all
the test cases we have.

Signed-off-by: Pawan <pawan@mayadata.io>

tests/run_test.go

@@ -0,0 +1,117 @@
+/*
+Copyright 2020 The OpenEBS 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 tests
+
+import (
+	"bytes"
+	"os/exec"
+	"strings"
+
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+)
+
+const (
+	snapYAML = `apiVersion: snapshot.storage.k8s.io/v1beta1
+kind: VolumeSnapshot
+metadata:
+  name: #snapname
+spec:
+  volumeSnapshotClassName: zfspv-snapclass
+  source:
+    persistentVolumeClaimName: #pvcname
+`
+
+	cloneYAML = `apiVersion: v1
+kind: PersistentVolumeClaim
+metadata:
+  name: #pvcname
+spec:
+  dataSource:
+    name: #snapname
+    kind: VolumeSnapshot
+    apiGroup: snapshot.storage.k8s.io
+  accessModes:
+    - ReadWriteOnce
+  resources:
+    requests:
+      storage: 5Gi
+  storageClassName: #storageclass
+`
+)
+
+func execAtLocal(cmd string, input []byte, args ...string) ([]byte, []byte, error) {
+	var stdout, stderr bytes.Buffer
+	command := exec.Command(cmd, args...)
+	command.Stdout = &stdout
+	command.Stderr = &stderr
+
+	if len(input) != 0 {
+		command.Stdin = bytes.NewReader(input)
+	}
+
+	err := command.Run()
+	return stdout.Bytes(), stderr.Bytes(), err
+}
+
+func kubectl(args ...string) ([]byte, []byte, error) {
+	return execAtLocal("kubectl", nil, args...)
+}
+
+func kubectlWithInput(input []byte, args ...string) ([]byte, []byte, error) {
+	return execAtLocal("kubectl", input, args...)
+}
+
+func verifySnapshotCreated(snapName string) bool {
+	Eventually(func() bool {
+		stdout, stderr, err := kubectl("get", "volumesnapshots.snapshot", snapName, "-n", OpenEBSNamespace, "-o=template", "--template={{.status.readyToUse}}")
+		Expect(err).ShouldNot(HaveOccurred(), "stdout=%s, stderr=%s", stdout, stderr)
+		return strings.TrimSpace(string(stdout)) == "true"
+	}, 240, 5).Should(BeTrue())
+	return true
+}
+
+func createSnapshot(pvcName, snapName string) {
+	By("creating snapshot for a pvc " + pvcName)
+
+	tyaml := strings.Replace(snapYAML, "#pvcname", pvcName, -1)
+	yaml := strings.Replace(tyaml, "#snapname", snapName, -1)
+
+	stdout, stderr, err := kubectlWithInput([]byte(yaml), "apply", "-n", OpenEBSNamespace, "-f", "-")
+	Expect(err).ShouldNot(HaveOccurred(), "stdout=%s, stderr=%s", stdout, stderr)
+}
+
+func createClone(clonepvc, snapname, storageclass string) {
+	By("creating clone volume from snapshot " + snapname)
+
+	syaml := strings.Replace(cloneYAML, "#snapname", snapname, -1)
+	cyaml := strings.Replace(syaml, "#pvcname", clonepvc, -1)
+	yaml := strings.Replace(cyaml, "#storageclass", storageclass, -1)
+
+	stdout, stderr, err := kubectlWithInput([]byte(yaml), "apply", "-n", OpenEBSNamespace, "-f", "-")
+	Expect(err).ShouldNot(HaveOccurred(), "stdout=%s, stderr=%s", stdout, stderr)
+}
+
+func deleteSnapshot(pvcName, snapName string) {
+	By("deleting the snapshot " + snapName)
+
+	tyaml := strings.Replace(snapYAML, "#pvcname", pvcName, -1)
+	yaml := strings.Replace(tyaml, "#snapname", snapName, -1)
+
+	stdout, stderr, err := kubectlWithInput([]byte(yaml), "delete", "-n", OpenEBSNamespace, "-f", "-")
+	Expect(err).ShouldNot(HaveOccurred(), "stdout=%s, stderr=%s", stdout, stderr)
+}