introduce TestFullNode#WaitTillChain(predicate).

itests/deals_test.go

@@ -239,23 +239,10 @@ func TestFirstDealEnablesMining(t *testing.T) {
 	// once the provider has mined a block, thanks to the power acquired from the deal,
 	// we pass the test.
 	providerMined := make(chan struct{})
-	heads, err := client.ChainNotify(ctx)
-	require.NoError(t, err)
 
 	go func() {
-		for chg := range heads {
-			for _, c := range chg {
-				if c.Type != "apply" {
-					continue
-				}
-				for _, b := range c.Val.Blocks() {
-					if b.Miner == provider.ActorAddr {
+		_ = client.WaitTillChain(ctx, kit2.BlockMinedBy(provider.ActorAddr))
 		close(providerMined)
-						return
-					}
-				}
-			}
-		}
 	}()
 
 	// now perform the deal.

itests/kit2/chain.go

@@ -1,21 +0,0 @@
-package kit2
-
-import (
-	"context"
-	"testing"
-	"time"
-
-	"github.com/filecoin-project/go-state-types/abi"
-	"github.com/stretchr/testify/require"
-)
-
-func WaitTillChainHeight(ctx context.Context, t *testing.T, node *TestFullNode, blocktime time.Duration, height int) abi.ChainEpoch {
-	for {
-		h, err := node.ChainHead(ctx)
-		require.NoError(t, err)
-		if h.Height() > abi.ChainEpoch(height) {
-			return h.Height()
-		}
-		time.Sleep(blocktime)
-	}
-}

itests/kit2/node_full.go

@@ -4,8 +4,11 @@ import (
 	"context"
 	"testing"
 
+	"github.com/filecoin-project/go-address"
+	"github.com/filecoin-project/go-state-types/abi"
 	"github.com/filecoin-project/lotus/api"
 	"github.com/filecoin-project/lotus/api/v1api"
+	"github.com/filecoin-project/lotus/chain/types"
 	"github.com/filecoin-project/lotus/chain/wallet"
 	"github.com/multiformats/go-multiaddr"
 	"github.com/stretchr/testify/require"
@@ -33,3 +36,50 @@ func (f *TestFullNode) CreateImportFile(ctx context.Context, rseed int, size int
 	require.NoError(f.t, err)
 	return res, path
 }
+
+// WaitTillChain waits until a specified chain condition is met. It returns
+// the first tipset where the condition is met.
+func (f *TestFullNode) WaitTillChain(ctx context.Context, pred ChainPredicate) *types.TipSet {
+	ctx, cancel := context.WithCancel(ctx)
+	defer cancel()
+
+	heads, err := f.ChainNotify(ctx)
+	require.NoError(f.t, err)
+
+	for chg := range heads {
+		for _, c := range chg {
+			if c.Type != "apply" {
+				continue
+			}
+			if ts := c.Val; pred(ts) {
+				return ts
+			}
+		}
+	}
+	require.Fail(f.t, "chain condition not met")
+	return nil
+}
+
+// ChainPredicate encapsulates a chain condition.
+type ChainPredicate func(set *types.TipSet) bool
+
+// HeightAtLeast returns a ChainPredicate that is satisfied when the chain
+// height is equal or higher to the target.
+func HeightAtLeast(target abi.ChainEpoch) ChainPredicate {
+	return func(ts *types.TipSet) bool {
+		return ts.Height() >= target
+	}
+}
+
+// BlockMinedBy returns a ChainPredicate that is satisfied when we observe the
+// first block mined by the specified miner.
+func BlockMinedBy(miner address.Address) ChainPredicate {
+	return func(ts *types.TipSet) bool {
+		for _, b := range ts.Blocks() {
+			if b.Miner == miner {
+				return true
+			}
+		}
+		return false
+	}
+}

itests/sector_pledge_test.go

@@ -58,7 +58,7 @@ func TestPledgeBatching(t *testing.T) {
 		client, miner, ens := kit2.EnsembleMinimal(t, kit2.MockProofs(), opts)
 		ens.InterconnectAll().BeginMining(blockTime)
 
-		kit2.WaitTillChainHeight(ctx, t, client, blockTime, 10)
+		client.WaitTillChain(ctx, kit2.HeightAtLeast(10))
 
 		toCheck := miner.StartPledge(ctx, nSectors, 0, nil)
 
@@ -115,7 +115,7 @@ func TestPledgeBeforeNv13(t *testing.T) {
 		client, miner, ens := kit2.EnsembleMinimal(t, kit2.MockProofs(), opts)
 		ens.InterconnectAll().BeginMining(blocktime)
 
-		kit2.WaitTillChainHeight(ctx, t, client, blocktime, 10)
+		client.WaitTillChain(ctx, kit2.HeightAtLeast(10))
 
 		toCheck := miner.StartPledge(ctx, nSectors, 0, nil)
 

itests/sector_terminate_test.go

@@ -57,8 +57,8 @@ func TestTerminate(t *testing.T) {
 		waitUntil := di.PeriodStart + di.WPoStProvingPeriod + 2
 		t.Logf("End for head.Height > %d", waitUntil)
 
-		height := kit2.WaitTillChainHeight(ctx, t, client, blocktime, int(waitUntil))
-		t.Logf("Now head.Height = %d", height)
+		ts := client.WaitTillChain(ctx, kit2.HeightAtLeast(waitUntil))
+		t.Logf("Now head.Height = %d", ts.Height())
 	}
 
 	nSectors++
@@ -140,8 +140,8 @@ loop:
 
 	waitUntil := di.PeriodStart + di.WPoStProvingPeriod + 2
 	t.Logf("End for head.Height > %d", waitUntil)
-	height := kit2.WaitTillChainHeight(ctx, t, client, blocktime, int(waitUntil))
-	t.Logf("Now head.Height = %d", height)
+	ts := client.WaitTillChain(ctx, kit2.HeightAtLeast(waitUntil))
+	t.Logf("Now head.Height = %d", ts.Height())
 
 	p, err = client.StateMinerPower(ctx, maddr, types.EmptyTSK)
 	require.NoError(t, err)