cleanup: move pkg/ to internal/

The internal/ directory in Go has a special meaning, and indicates that
those packages are not meant for external consumption. Ceph-CSI does
provide public APIs for other projects to consume. There is no plan to
keep the API of the internally used packages stable.

Closes: #903
Signed-off-by: Niels de Vos <ndevos@redhat.com>

internal/rbd/rbd_util_test.go

@@ -0,0 +1,56 @@
+/*
+Copyright 2020 The Ceph-CSI 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 rbd
+
+import (
+	"testing"
+)
+
+func TestIsLegacyVolumeID(t *testing.T) {
+	tests := []struct {
+		volID    string
+		isLegacy bool
+	}{
+		{"prefix-bda37d42-9979-420f-9389-74362f3f98f6", false},
+		{"csi-rbd-vo-f997e783-ff00-48b0-8cc7-30cb36c3df3d", false},
+		{"csi-rbd-vol-this-is-clearly-not-a-valid-UUID----", false},
+		{"csi-rbd-vol-b82f27de-3b3a-43f2-b5e7-9f8d0aad04e9", true},
+	}
+
+	for _, test := range tests {
+		if got := isLegacyVolumeID(test.volID); got != test.isLegacy {
+			t.Errorf("isLegacyVolumeID(%s) = %t, want %t", test.volID, got, test.isLegacy)
+		}
+	}
+}
+
+func TestHasSnapshotFeature(t *testing.T) {
+	tests := []struct {
+		features   string
+		hasFeature bool
+	}{
+		{"foo", false},
+		{"foo,bar", false},
+		{"foo,layering,bar", true},
+	}
+
+	for _, test := range tests {
+		if got := hasSnapshotFeature(test.features); got != test.hasFeature {
+			t.Errorf("hasSnapshotFeature(%s) = %t, want %t", test.features, got, test.hasFeature)
+		}
+	}
+}