Fix tests using 1k sectors

chain/gen/gen_test.go

@@ -2,8 +2,14 @@ package gen
 
 import (
 	"testing"
+
+	"github.com/filecoin-project/lotus/build"
 )
 
+func init() {
+	build.SectorSizes = []uint64{1024}
+}
+
 func testGeneration(t testing.TB, n int, msgs int) {
 	g, err := NewGenerator()
 	if err != nil {

chain/sync_test.go

@@ -27,6 +27,7 @@ import (
 func init() {
 	build.InsecurePoStValidation = true
 	os.Setenv("TRUST_PARAMS", "1")
+	build.SectorSizes = []uint64{1024}
 }
 
 const source = 0