Unit testing for def/ module.

Added unit tests to test code in def/ module.

vendor/github.com/samuel/go-zookeeper/zk/constants.go

@@ -2,6 +2,7 @@ package zk
 
 import (
 	"errors"
+	"fmt"
 )
 
 const (
@@ -25,6 +26,7 @@ const (
 	opGetChildren2 = 12
 	opCheck        = 13
 	opMulti        = 14
+	opReconfig     = 16
 	opClose        = -11
 	opSetAuth      = 100
 	opSetWatches   = 101
@@ -92,7 +94,7 @@ func (s State) String() string {
 	if name := stateNames[s]; name != "" {
 		return name
 	}
-	return "Unknown"
+	return "unknown state"
 }
 
 type ErrCode int32
@@ -113,8 +115,10 @@ var (
 	ErrClosing                 = errors.New("zk: zookeeper is closing")
 	ErrNothing                 = errors.New("zk: no server responsees to process")
 	ErrSessionMoved            = errors.New("zk: session moved to another server, so operation is ignored")
-
+	ErrReconfigDisabled        = errors.New("attempts to perform a reconfiguration operation when reconfiguration feature is disabled")
+	ErrBadArguments            = errors.New("invalid arguments")
 	// ErrInvalidCallback         = errors.New("zk: invalid callback specified")
+
 	errCodeToError = map[ErrCode]error{
 		0:                          nil,
 		errAPIError:                ErrAPIError,
@@ -126,11 +130,13 @@ var (
 		errNotEmpty:                ErrNotEmpty,
 		errSessionExpired:          ErrSessionExpired,
 		// errInvalidCallback:         ErrInvalidCallback,
-		errInvalidAcl:   ErrInvalidACL,
-		errAuthFailed:   ErrAuthFailed,
-		errClosing:      ErrClosing,
-		errNothing:      ErrNothing,
-		errSessionMoved: ErrSessionMoved,
+		errInvalidAcl:        ErrInvalidACL,
+		errAuthFailed:        ErrAuthFailed,
+		errClosing:           ErrClosing,
+		errNothing:           ErrNothing,
+		errSessionMoved:      ErrSessionMoved,
+		errZReconfigDisabled: ErrReconfigDisabled,
+		errBadArguments:      ErrBadArguments,
 	}
 )
 
@@ -138,7 +144,7 @@ func (e ErrCode) toError() error {
 	if err, ok := errCodeToError[e]; ok {
 		return err
 	}
-	return ErrUnknown
+	return fmt.Errorf("unknown error: %v", e)
 }
 
 const (
@@ -168,6 +174,8 @@ const (
 	errClosing                 ErrCode = -116
 	errNothing                 ErrCode = -117
 	errSessionMoved            ErrCode = -118
+	// Attempts to perform a reconfiguration operation when reconfiguration feature is disabled
+	errZReconfigDisabled ErrCode = -123
 )
 
 // Constants for ACL permissions
@@ -197,6 +205,7 @@ var (
 		opGetChildren2: "getChildren2",
 		opCheck:        "check",
 		opMulti:        "multi",
+		opReconfig:     "reconfig",
 		opClose:        "close",
 		opSetAuth:      "setAuth",
 		opSetWatches:   "setWatches",