code-hygiene: Clean up node shutdown in testing (cosmos#1073)

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## Overview

Closes: cosmos#1072

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## Checklist

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- [x] New and updated code has appropriate documentation
- [x] New and updated code has new and/or updated testing
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- [x] Linked issues closed with keywords

Author: Manav-Aggarwal

block/manager.go

@@ -250,6 +250,7 @@ func (m *Manager) SetFraudProofService(fraudProofServ *fraudserv.ProofService) {
 }
 
 func (m *Manager) ProcessFraudProof(ctx context.Context, cancel context.CancelFunc) {
+	defer cancel()
 	// subscribe to state fraud proof
 	sub, err := m.executor.FraudService.Subscribe(types.StateFraudProofType)
 	if err != nil {
@@ -281,7 +282,6 @@ func (m *Manager) ProcessFraudProof(ctx context.Context, cancel context.CancelFu
 
 	// halt chain
 	m.logger.Info("verified fraud proof, halting chain")
-	cancel()
 }
 
 // SyncLoop is responsible for syncing blocks.

block/manager_test.go

@@ -33,7 +33,8 @@ func TestInitialState(t *testing.T) {
 		NextValidators:  types.GetRandomValidatorSet(),
 	}
 
-	ctx := context.Background()
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
 	es, _ := store.NewDefaultInMemoryKVStore()
 	emptyStore := store.New(ctx, es)
 
@@ -79,6 +80,9 @@ func TestInitialState(t *testing.T) {
 			assert := assert.New(t)
 			logger := log.TestingLogger()
 			dalc := getMockDALC(logger)
+			defer func() {
+				require.NoError(t, dalc.Stop())
+			}()
 			dumbChan := make(chan struct{})
 			agg, err := NewManager(key, conf, c.genesis, c.store, nil, nil, dalc, nil, logger, dumbChan)
 			assert.NoError(err)

da/test/da_test.go

@@ -74,8 +74,9 @@ func doTestLifecycle(t *testing.T, dalc da.DataAvailabilityLayerClient) {
 	err = dalc.Start()
 	require.NoError(err)
 
-	err = dalc.Stop()
-	require.NoError(err)
+	defer func() {
+		require.NoError(dalc.Stop())
+	}()
 }
 
 func TestDALC(t *testing.T) {
@@ -89,7 +90,8 @@ func TestDALC(t *testing.T) {
 func doTestDALC(t *testing.T, dalc da.DataAvailabilityLayerClient) {
 	require := require.New(t)
 	assert := assert.New(t)
-	ctx := context.Background()
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
 
 	// mock DALC will advance block height every 100ms
 	conf := []byte{}
@@ -105,6 +107,9 @@ func doTestDALC(t *testing.T, dalc da.DataAvailabilityLayerClient) {
 
 	err = dalc.Start()
 	require.NoError(err)
+	defer func() {
+		require.NoError(dalc.Stop())
+	}()
 
 	// wait a bit more than mockDaBlockTime, so mock can "produce" some blocks
 	time.Sleep(mockDaBlockTime + 20*time.Millisecond)
@@ -151,7 +156,8 @@ func TestRetrieve(t *testing.T) {
 }
 
 func doTestRetrieve(t *testing.T, dalc da.DataAvailabilityLayerClient) {
-	ctx := context.Background()
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
 	require := require.New(t)
 	assert := assert.New(t)
 
@@ -169,6 +175,9 @@ func doTestRetrieve(t *testing.T, dalc da.DataAvailabilityLayerClient) {
 
 	err = dalc.Start()
 	require.NoError(err)
+	defer func() {
+		require.NoError(dalc.Stop())
+	}()
 
 	// wait a bit more than mockDaBlockTime, so mock can "produce" some blocks
 	time.Sleep(mockDaBlockTime + 20*time.Millisecond)