rbd: add tests for GetPoolMetadata() and SetPoolMetadata()

Added test cases for GetPoolMetadata() func and SetPoolMetadata() func.

Signed-off-by: Mudit Agarwal <muagarwa@redhat.com>

rbd/pool_nautilus_test.go

@@ -0,0 +1,62 @@
+// +build !luminous,!mimic
+
+package rbd
+
+import (
+	"math/rand"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestPoolMetadata(t *testing.T) {
+	conn := radosConnect(t)
+	poolName := GetUUID()
+	err := conn.MakePool(poolName)
+	assert.NoError(t, err)
+
+	ioctx, err := conn.OpenIOContext(poolName)
+	assert.NoError(t, err)
+	assert.NotNil(t, ioctx)
+
+	defer func() {
+		ioctx.Destroy()
+		conn.DeletePool(poolName)
+		conn.Shutdown()
+	}()
+
+	t.Run("GetWrongKey", func(t *testing.T) {
+		_, err := GetPoolMetadata(ioctx, "someKey")
+		assert.Error(t, err)
+	})
+
+	t.Run("SetGetValues", func(t *testing.T) {
+		var (
+			key1 = "key1"
+			val1 = "val1"
+		)
+
+		err := SetPoolMetadata(ioctx, key1, val1)
+		assert.NoError(t, err)
+		metaVal, err := GetPoolMetadata(ioctx, key1)
+		assert.NoError(t, err)
+		assert.Equal(t, val1, metaVal)
+	})
+
+	t.Run("largeSetValue", func(t *testing.T) {
+		keyLen := 5004
+		var charValues = "_:$%&/()"
+
+		bytes := make([]byte, keyLen)
+		for i := 0; i < keyLen; i++ {
+			bytes[i] = charValues[rand.Intn(len(charValues))]
+		}
+		myKey := "myKey"
+		err := SetPoolMetadata(ioctx, myKey, string(bytes))
+		assert.NoError(t, err)
+
+		myVal, err := GetPoolMetadata(ioctx, myKey)
+		assert.NoError(t, err)
+		assert.Equal(t, keyLen, len(myVal))
+	})
+}