diff --git a/x/mstaking/types/authz_test.go b/x/mstaking/types/authz_test.go
index 418467b4..73e928a0 100644
--- a/x/mstaking/types/authz_test.go
+++ b/x/mstaking/types/authz_test.go
@@ -1,3 +1,273 @@
 package types_test
 
-// TODO implement test
+import (
+	"context"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+
+	"cosmossdk.io/math"
+	sdk "github.com/cosmos/cosmos-sdk/types"
+	"github.com/cosmos/cosmos-sdk/x/authz"
+
+	"github.com/initia-labs/initia/x/mstaking/types"
+)
+
+func TestNewStakeAuthorization(t *testing.T) {
+	tests := []struct {
+		name              string
+		allowedValidators []string
+		deniedValidators  []string
+		authzType         types.AuthorizationType
+		amount           sdk.Coins
+		expectError      bool
+	}{
+		{
+			name:              "valid authorization with allow list",
+			allowedValidators: []string{"val1", "val2"},
+			deniedValidators:  nil,
+			authzType:         types.AuthorizationType_AUTHORIZATION_TYPE_DELEGATE,
+			amount:           sdk.NewCoins(sdk.NewCoin("stake", math.NewInt(1000))),
+			expectError:      false,
+		},
+		{
+			name:              "valid authorization with deny list",
+			allowedValidators: nil,
+			deniedValidators:  []string{"val1", "val2"},
+			authzType:         types.AuthorizationType_AUTHORIZATION_TYPE_UNDELEGATE,
+			amount:           sdk.NewCoins(sdk.NewCoin("stake", math.NewInt(1000))),
+			expectError:      false,
+		},
+	}
+
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			authorization, err := types.NewStakeAuthorization(
+				tc.allowedValidators,
+				tc.deniedValidators,
+				tc.authzType,
+				tc.amount,
+			)
+
+			if tc.expectError {
+				require.Error(t, err)
+				return
+			}
+
+			require.NoError(t, err)
+			require.NotNil(t, authorization)
+
+			if tc.allowedValidators != nil {
+				require.NotNil(t, authorization.GetAllowList())
+				require.Equal(t, tc.allowedValidators, authorization.GetAllowList().Address)
+			}
+
+			if tc.deniedValidators != nil {
+				require.NotNil(t, authorization.GetDenyList())
+				require.Equal(t, tc.deniedValidators, authorization.GetDenyList().Address)
+			}
+
+			require.Equal(t, tc.authzType, authorization.AuthorizationType)
+			if tc.amount != nil {
+				require.Equal(t, tc.amount, authorization.MaxTokens)
+			}
+		})
+	}
+}
+
+func TestStakeAuthorization_ValidateBasic(t *testing.T) {
+	tests := []struct {
+		name        string
+		auth        types.StakeAuthorization
+		expectError bool
+	}{
+		{
+			name: "valid authorization",
+			auth: types.StakeAuthorization{
+				MaxTokens:         sdk.NewCoins(sdk.NewCoin("stake", math.NewInt(1000))),
+				AuthorizationType: types.AuthorizationType_AUTHORIZATION_TYPE_DELEGATE,
+			},
+			expectError: false,
+		},
+		{
+			name: "invalid - negative coins",
+			auth: types.StakeAuthorization{
+				MaxTokens:         sdk.Coins{sdk.Coin{Denom: "stake", Amount: math.NewInt(-1000)}},
+				AuthorizationType: types.AuthorizationType_AUTHORIZATION_TYPE_DELEGATE,
+			},
+			expectError: true,
+		},
+		{
+			name: "invalid - unspecified authorization type",
+			auth: types.StakeAuthorization{
+				MaxTokens:         sdk.NewCoins(sdk.NewCoin("stake", math.NewInt(1000))),
+				AuthorizationType: types.AuthorizationType_AUTHORIZATION_TYPE_UNSPECIFIED,
+			},
+			expectError: true,
+		},
+	}
+
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			err := tc.auth.ValidateBasic()
+			if tc.expectError {
+				require.Error(t, err)
+			} else {
+				require.NoError(t, err)
+			}
+		})
+	}
+}
+
+func TestStakeAuthorization_Accept(t *testing.T) {
+	tests := []struct {
+		name        string
+		auth        types.StakeAuthorization
+		msg         sdk.Msg
+		expectError bool
+	}{
+		{
+			name: "valid delegate with allow list",
+			auth: types.StakeAuthorization{
+				Validators: &types.StakeAuthorization_AllowList{
+					AllowList: &types.StakeAuthorization_Validators{
+						Address: []string{"val1"},
+					},
+				},
+				MaxTokens:         sdk.NewCoins(sdk.NewCoin("stake", math.NewInt(1000))),
+				AuthorizationType: types.AuthorizationType_AUTHORIZATION_TYPE_DELEGATE,
+			},
+			msg: &types.MsgDelegate{
+				DelegatorAddress: "delegator",
+				ValidatorAddress: "val1",
+				Amount:          sdk.NewCoins(sdk.NewCoin("stake", math.NewInt(500))),
+			},
+			expectError: false,
+		},
+		{
+			name: "invalid - validator not in allow list",
+			auth: types.StakeAuthorization{
+				Validators: &types.StakeAuthorization_AllowList{
+					AllowList: &types.StakeAuthorization_Validators{
+						Address: []string{"val1"},
+					},
+				},
+				MaxTokens:         sdk.NewCoins(sdk.NewCoin("stake", math.NewInt(1000))),
+				AuthorizationType: types.AuthorizationType_AUTHORIZATION_TYPE_DELEGATE,
+			},
+			msg: &types.MsgDelegate{
+				DelegatorAddress: "delegator",
+				ValidatorAddress: "val2",
+				Amount:          sdk.NewCoins(sdk.NewCoin("stake", math.NewInt(500))),
+			},
+			expectError: true,
+		},
+		{
+			name: "invalid - validator in deny list",
+			auth: types.StakeAuthorization{
+				Validators: &types.StakeAuthorization_DenyList{
+					DenyList: &types.StakeAuthorization_Validators{
+						Address: []string{"val1"},
+					},
+				},
+				MaxTokens:         sdk.NewCoins(sdk.NewCoin("stake", math.NewInt(1000))),
+				AuthorizationType: types.AuthorizationType_AUTHORIZATION_TYPE_DELEGATE,
+			},
+			msg: &types.MsgDelegate{
+				DelegatorAddress: "delegator",
+				ValidatorAddress: "val1",
+				Amount:          sdk.NewCoins(sdk.NewCoin("stake", math.NewInt(500))),
+			},
+			expectError: true,
+		},
+		{
+			name: "invalid - exceeds max tokens",
+			auth: types.StakeAuthorization{
+				Validators: &types.StakeAuthorization_AllowList{
+					AllowList: &types.StakeAuthorization_Validators{
+						Address: []string{"val1"},
+					},
+				},
+				MaxTokens:         sdk.NewCoins(sdk.NewCoin("stake", math.NewInt(400))),
+				AuthorizationType: types.AuthorizationType_AUTHORIZATION_TYPE_DELEGATE,
+			},
+			msg: &types.MsgDelegate{
+				DelegatorAddress: "delegator",
+				ValidatorAddress: "val1",
+				Amount:          sdk.NewCoins(sdk.NewCoin("stake", math.NewInt(500))),
+			},
+			expectError: true,
+		},
+	}
+
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			resp, err := tc.auth.Accept(context.Background(), tc.msg)
+			if tc.expectError {
+				require.Error(t, err)
+				return
+			}
+
+			require.NoError(t, err)
+			require.True(t, resp.Accept)
+			
+			// Check if authorization should be deleted (when max tokens are used up)
+			if tc.auth.MaxTokens != nil {
+				msgCoins := tc.msg.(*types.MsgDelegate).Amount
+				if tc.auth.MaxTokens.Equal(msgCoins) {
+					require.True(t, resp.Delete)
+				}
+			}
+		})
+	}
+}
+
+func TestStakeAuthorization_MsgTypeURL(t *testing.T) {
+	tests := []struct {
+		name        string
+		authzType   types.AuthorizationType
+		expectError bool
+	}{
+		{
+			name:        "delegate authorization",
+			authzType:   types.AuthorizationType_AUTHORIZATION_TYPE_DELEGATE,
+			expectError: false,
+		},
+		{
+			name:        "undelegate authorization",
+			authzType:   types.AuthorizationType_AUTHORIZATION_TYPE_UNDELEGATE,
+			expectError: false,
+		},
+		{
+			name:        "redelegate authorization",
+			authzType:   types.AuthorizationType_AUTHORIZATION_TYPE_REDELEGATE,
+			expectError: false,
+		},
+		{
+			name:        "cancel unbonding delegation authorization",
+			authzType:   types.AuthorizationType_AUTHORIZATION_TYPE_CANCEL_UNBONDING_DELEGATION,
+			expectError: false,
+		},
+		{
+			name:        "unspecified authorization type",
+			authzType:   types.AuthorizationType_AUTHORIZATION_TYPE_UNSPECIFIED,
+			expectError: true,
+		},
+	}
+
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			auth := types.StakeAuthorization{
+				AuthorizationType: tc.authzType,
+			}
+
+			if tc.expectError {
+				require.Panics(t, func() { auth.MsgTypeURL() })
+				return
+			}
+
+			url := auth.MsgTypeURL()
+			require.NotEmpty(t, url)
+		})
+	}
+}