feat(group): add test for keeper and cli (#11679)

## Description

Closes: #XXXX



---

### Author Checklist

*All items are required. Please add a note to the item if the item is not applicable and
please add links to any relevant follow up issues.*

I have...

- [ ] included the correct [type prefix](https://github.com/commitizen/conventional-commit-types/blob/v3.0.0/index.json) in the PR title
- [ ] added `!` to the type prefix if API or client breaking change
- [ ] targeted the correct branch (see [PR Targeting](https://github.com/cosmos/cosmos-sdk/blob/master/CONTRIBUTING.md#pr-targeting))
- [ ] provided a link to the relevant issue or specification
- [ ] followed the guidelines for [building modules](https://github.com/cosmos/cosmos-sdk/blob/master/docs/building-modules)
- [ ] included the necessary unit and integration [tests](https://github.com/cosmos/cosmos-sdk/blob/master/CONTRIBUTING.md#testing)
- [ ] added a changelog entry to `CHANGELOG.md`
- [ ] included comments for [documenting Go code](https://blog.golang.org/godoc)
- [ ] updated the relevant documentation or specification
- [ ] reviewed "Files changed" and left comments if necessary
- [ ] confirmed all CI checks have passed

### Reviewers Checklist

*All items are required. Please add a note if the item is not applicable and please add
your handle next to the items reviewed if you only reviewed selected items.*

I have...

- [ ] confirmed the correct [type prefix](https://github.com/commitizen/conventional-commit-types/blob/v3.0.0/index.json) in the PR title
- [ ] confirmed `!` in the type prefix if API or client breaking change
- [ ] confirmed all author checklist items have been addressed 
- [ ] reviewed state machine logic
- [ ] reviewed API design and naming
- [ ] reviewed documentation is accurate
- [ ] reviewed tests and test coverage
- [ ] manually tested (if applicable)

codec/amino.go

@@ -47,7 +47,6 @@ func MarshalJSONIndent(cdc *LegacyAmino, obj interface{}) ([]byte, error) {
 	if err = json.Indent(&out, bz, "", "  "); err != nil {
 		return nil, err
 	}
-
 	return out.Bytes(), nil
 }
 

x/group/client/testutil/query.go

@@ -793,7 +793,7 @@ func (s *IntegrationTestSuite) TestTallyResult() {
 	var txResp sdk.TxResponse
 	s.Require().NoError(val.ClientCtx.Codec.UnmarshalJSON(out.Bytes(), &txResp), out.String())
 	s.Require().Equal(uint32(0), txResp.Code, out.String())
-	proposalId := s.getProposalIdFromTxResponse(txResp)
+	proposalID := s.getProposalIDFromTxResponse(txResp)
 
 	testCases := []struct {
 		name           string
@@ -828,7 +828,7 @@ func (s *IntegrationTestSuite) TestTallyResult() {
 		{
 			"valid proposal id with no votes",
 			[]string{
-				proposalId,
+				proposalID,
 				fmt.Sprintf("--%s=json", tmcli.OutputFlag),
 			},
 			false,

x/group/keeper/keeper_test.go

@@ -2831,6 +2831,53 @@ func (s *TestSuite) TestLeaveGroup() {
 	}
 }
 
+func (s *TestSuite) TestPruneProposals() {
+	addrs := s.addrs
+	expirationTime := time.Hour * 24 * 15 // 15 days
+	groupID := s.groupID
+	accountAddr := s.groupPolicyAddr
+
+	msgSend := &banktypes.MsgSend{
+		FromAddress: s.groupPolicyAddr.String(),
+		ToAddress:   addrs[0].String(),
+		Amount:      sdk.Coins{sdk.NewInt64Coin("test", 100)},
+	}
+
+	policyReq := &group.MsgCreateGroupPolicy{
+		Admin:   addrs[0].String(),
+		GroupId: groupID,
+	}
+
+	policy := group.NewThresholdDecisionPolicy("100", time.Microsecond, time.Microsecond)
+	err := policyReq.SetDecisionPolicy(policy)
+	s.Require().NoError(err)
+	_, err = s.keeper.CreateGroupPolicy(s.ctx, policyReq)
+	s.Require().NoError(err)
+
+	req := &group.MsgSubmitProposal{
+		GroupPolicyAddress: accountAddr.String(),
+		Proposers:          []string{addrs[1].String()},
+	}
+	err = req.SetMsgs([]sdk.Msg{msgSend})
+	s.Require().NoError(err)
+	submittedProposal, err := s.keeper.SubmitProposal(s.ctx, req)
+	s.Require().NoError(err)
+	queryProposal := group.QueryProposalRequest{ProposalId: submittedProposal.ProposalId}
+	prePrune, err := s.keeper.Proposal(s.ctx, &queryProposal)
+	s.Require().NoError(err)
+	s.Require().Equal(prePrune.Proposal.Id, submittedProposal.ProposalId)
+	// Move Forward in time for 15 days, after voting period end + max_execution_period
+	s.sdkCtx = s.sdkCtx.WithBlockTime(s.sdkCtx.BlockTime().Add(expirationTime))
+
+	// Prune Expired Proposals
+	err = s.keeper.PruneProposals(s.sdkCtx)
+	s.Require().NoError(err)
+	postPrune, err := s.keeper.Proposal(s.ctx, &queryProposal)
+	s.Require().Nil(postPrune)
+	s.Require().Error(err)
+	s.Require().Contains(err.Error(), "load proposal: not found")
+}
+
 func submitProposal(
 	ctx context.Context, s *TestSuite, msgs []sdk.Msg,
 	proposers []string) uint64 {