Gate execution of missing volume test case for NodeUnpublishVolume

The "should fail when the volume is missing" test for
NodeUnpublishVolume verifies that a NotFound error occurs when the
endpoint is invoked for a missing volume. However, this expectation
really only holds for volume types that are locally attached, such as
local disks or iscsi. Specifically, it would not hold for
network-attached storage where it is fine to return Ok if the mount
point does not exist.

This change introduces a flag to gate execution of the test, defaulting
it not running since that was the behavior we have had before.

cmd/csi-sanity/main.go

@@ -85,6 +85,7 @@ func main() {
 	stringVar(&config.TestVolumeParametersFile, "testvolumeparameters", "YAML file of volume parameters for provisioned volumes")
 	stringVar(&config.TestSnapshotParametersFile, "testsnapshotparameters", "YAML file of snapshot parameters for provisioned snapshots")
 	boolVar(&config.TestNodeVolumeAttachLimit, "testnodevolumeattachlimit", "Test node volume attach limit")
+	boolVar(&config.TestNodeUnpublishVolumeMissingVolume, "testnodeunpublishvolumemissingvolume", "Test case for missing volume on NodeUnpublishVolume")
 	stringVar(&config.JUnitFile, "junitfile", "JUnit XML output file where test results will be written")
 
 	flag.Parse()

pkg/sanity/node.go

@@ -422,6 +422,10 @@ var _ = DescribeSanity("Node Service", func(sc *TestContext) {
 
 		It("should fail when the volume is missing", func() {
 
+			if !sc.Config.TestNodeUnpublishVolumeMissingVolume {
+				Skip("missing volume on NodeUnpublishVolume disabled")
+			}
+
 			_, err := c.NodeUnpublishVolume(
 				context.Background(),
 				&csi.NodeUnpublishVolumeRequest{

pkg/sanity/sanity.go

@@ -91,11 +91,12 @@ type TestConfig struct {
 	TestVolumeSize int64
 
 	// Target size for ExpandVolume requests. If not specified it defaults to TestVolumeSize + 1 GB
-	TestVolumeExpandSize      int64
-	TestVolumeParametersFile  string
-	TestVolumeParameters      map[string]string
-	TestNodeVolumeAttachLimit bool
-	TestVolumeAccessType      string
+	TestVolumeExpandSize                 int64
+	TestVolumeParametersFile             string
+	TestVolumeParameters                 map[string]string
+	TestNodeVolumeAttachLimit            bool
+	TestVolumeAccessType                 string
+	TestNodeUnpublishVolumeMissingVolume bool
 
 	// JUnitFile is used by Test to store test results in JUnit
 	// format. When using GinkgoTest, the caller is responsible