diff --git a/planner/core/indexmerge_test.go b/planner/core/indexmerge_test.go
index c69215b52a173..13827af5d1f23 100644
--- a/planner/core/indexmerge_test.go
+++ b/planner/core/indexmerge_test.go
@@ -16,42 +16,17 @@ package core
 
 import (
 	"context"
+	"testing"
 
-	. "github.com/pingcap/check"
 	"github.com/pingcap/tidb/infoschema"
 	"github.com/pingcap/tidb/parser"
 	"github.com/pingcap/tidb/parser/model"
 	"github.com/pingcap/tidb/planner/util"
-	"github.com/pingcap/tidb/sessionctx"
+	"github.com/pingcap/tidb/testkit/testdata"
 	"github.com/pingcap/tidb/util/hint"
-	"github.com/pingcap/tidb/util/testleak"
-	"github.com/pingcap/tidb/util/testutil"
+	"github.com/stretchr/testify/require"
 )
 
-var _ = Suite(&testIndexMergeSuite{})
-
-type testIndexMergeSuite struct {
-	*parser.Parser
-
-	is  infoschema.InfoSchema
-	ctx sessionctx.Context
-
-	testdata testutil.TestData
-}
-
-func (s *testIndexMergeSuite) SetUpSuite(c *C) {
-	s.is = infoschema.MockInfoSchema([]*model.TableInfo{MockSignedTable(), MockView()})
-	s.ctx = MockContext()
-	s.Parser = parser.New()
-	var err error
-	s.testdata, err = testutil.LoadTestSuiteData("testdata", "index_merge_suite")
-	c.Assert(err, IsNil)
-}
-
-func (s *testIndexMergeSuite) TearDownSuite(c *C) {
-	c.Assert(s.testdata.GenerateOutputIfNeeded(), IsNil)
-}
-
 func getIndexMergePathDigest(paths []*util.AccessPath, startIndex int) string {
 	if len(paths) == startIndex {
 		return "[]"
@@ -82,31 +57,34 @@ func getIndexMergePathDigest(paths []*util.AccessPath, startIndex int) string {
 	return idxMergeDisgest
 }
 
-func (s *testIndexMergeSuite) TestIndexMergePathGeneration(c *C) {
-	defer testleak.AfterTest(c)()
+func TestIndexMergePathGeneration(t *testing.T) {
+	t.Parallel()
 	var input, output []string
-	s.testdata.GetTestCases(c, &input, &output)
+	indexMergeSuiteData.GetTestCases(t, &input, &output)
 	ctx := context.TODO()
+	sctx := MockContext()
+	is := infoschema.MockInfoSchema([]*model.TableInfo{MockSignedTable(), MockView()})
+
+	parser := parser.New()
+
 	for i, tc := range input {
-		comment := Commentf("case:%v sql:%s", i, tc)
-		stmt, err := s.ParseOneStmt(tc, "", "")
-		c.Assert(err, IsNil, comment)
-		err = Preprocess(s.ctx, stmt, WithPreprocessorReturn(&PreprocessorReturn{InfoSchema: s.is}))
-		c.Assert(err, IsNil)
-		builder, _ := NewPlanBuilder().Init(MockContext(), s.is, &hint.BlockHintProcessor{})
+		stmt, err := parser.ParseOneStmt(tc, "", "")
+		require.NoErrorf(t, err, "case:%v sql:%s", i, tc)
+		err = Preprocess(sctx, stmt, WithPreprocessorReturn(&PreprocessorReturn{InfoSchema: is}))
+		require.NoError(t, err)
+		builder, _ := NewPlanBuilder().Init(MockContext(), is, &hint.BlockHintProcessor{})
 		p, err := builder.Build(ctx, stmt)
 		if err != nil {
-			s.testdata.OnRecord(func() {
+			testdata.OnRecord(func() {
 				output[i] = err.Error()
 			})
-			c.Assert(err.Error(), Equals, output[i], comment)
+			require.Equal(t, output[i], err.Error(), "case:%v sql:%s", i, tc)
 			continue
 		}
-		c.Assert(err, IsNil)
+		require.NoError(t, err)
 		p, err = logicalOptimize(ctx, builder.optFlag, p.(LogicalPlan))
-		c.Assert(err, IsNil)
+		require.NoError(t, err)
 		lp := p.(LogicalPlan)
-		c.Assert(err, IsNil)
 		var ds *DataSource
 		for ds == nil {
 			switch v := lp.(type) {
@@ -119,11 +97,11 @@ func (s *testIndexMergeSuite) TestIndexMergePathGeneration(c *C) {
 		ds.ctx.GetSessionVars().SetEnableIndexMerge(true)
 		idxMergeStartIndex := len(ds.possibleAccessPaths)
 		_, err = lp.recursiveDeriveStats(nil)
-		c.Assert(err, IsNil)
+		require.NoError(t, err)
 		result := getIndexMergePathDigest(ds.possibleAccessPaths, idxMergeStartIndex)
-		s.testdata.OnRecord(func() {
+		testdata.OnRecord(func() {
 			output[i] = result
 		})
-		c.Assert(result, Equals, output[i], comment)
+		require.Equalf(t, output[i], result, "case:%v sql:%s", i, tc)
 	}
 }
diff --git a/planner/core/main_test.go b/planner/core/main_test.go
index df250425aaaf4..236d154ff8934 100644
--- a/planner/core/main_test.go
+++ b/planner/core/main_test.go
@@ -24,7 +24,8 @@ import (
 	"go.uber.org/goleak"
 )
 
-var testDataMap = make(testdata.BookKeeper, 1)
+var testDataMap = make(testdata.BookKeeper, 2)
+var indexMergeSuiteData testdata.TestData
 
 func TestMain(m *testing.M) {
 	testbridge.WorkaroundGoCheckFlags()
@@ -32,6 +33,8 @@ func TestMain(m *testing.M) {
 	flag.Parse()
 
 	testDataMap.LoadTestSuiteData("testdata", "integration_partition_suite")
+	testDataMap.LoadTestSuiteData("testdata", "index_merge_suite")
+	indexMergeSuiteData = testDataMap["index_merge_suite"]
 
 	opts := []goleak.Option{
 		goleak.IgnoreTopFunction("go.etcd.io/etcd/pkg/logutil.(*MergeLogger).outputLoop"),