diff --git a/tests/sync_test.go b/tests/sync_test.go
index 907e0a5e..23d57183 100644
--- a/tests/sync_test.go
+++ b/tests/sync_test.go
@@ -11,6 +11,7 @@ import (
 	"xorm.io/xorm/schemas"
 )
 
+// Test Sync with unique index and normal index
 type TestSync1 struct {
 	Id      int64
 	ClassId int64 `xorm:"index"`
@@ -29,9 +30,46 @@ func (TestSync2) TableName() string {
 	return "test_sync"
 }
 
-func TestSync(t *testing.T) {
+func Test_SyncChangeIndexType(t *testing.T) {
 	assert.NoError(t, testEngine.Sync(new(TestSync1)))
+	tables, err := testEngine.DBMetas()
+	assert.NoError(t, err)
+	var testTable *schemas.Table
+	for _, table := range tables {
+		if table.Name == "test_sync" {
+			testTable = table
+			break
+		}
+	}
+	assert.NotNil(t, testTable)
+	assert.Len(t, testTable.Columns(), 2)
+
+	assert.Len(t, testTable.Indexes, 1)
+	index := testTable.Indexes["class_id"]
+	assert.NotNil(t, index)
+	assert.Len(t, index.Cols, 1)
+	assert.Equal(t, "class_id", index.Cols[0])
+	assert.Equal(t, schemas.IndexType, index.Type)
+
 	assert.NoError(t, testEngine.Sync(new(TestSync2)))
+	tables, err = testEngine.DBMetas()
+	assert.NoError(t, err)
+	testTable = nil
+	for _, table := range tables {
+		if table.Name == "test_sync" {
+			testTable = table
+			break
+		}
+	}
+	assert.NotNil(t, testTable)
+	assert.Len(t, testTable.Columns(), 2)
+
+	assert.Len(t, testTable.Indexes, 1)
+	index = testTable.Indexes["class_id"]
+	assert.NotNil(t, index)
+	assert.Len(t, index.Cols, 1)
+	assert.Equal(t, "class_id", index.Cols[0])
+	assert.Equal(t, schemas.UniqueType, index.Type)
 }
 
 // Test Sync with varchar size changed
@@ -183,7 +221,7 @@ func Test_SyncVarcharDefaultChange(t *testing.T) {
 	}
 	assert.NotNil(t, testTable)
 	assert.Len(t, testTable.Columns(), 2)
-	assert.Equal(t, "1", testTable.GetColumn("name").Default)
+	assert.Equal(t, "'1'", testTable.GetColumn("name").Default)
 
 	assert.NoError(t, testEngine.Sync(new(TestSync8)))
 
@@ -198,5 +236,5 @@ func Test_SyncVarcharDefaultChange(t *testing.T) {
 	}
 	assert.NotNil(t, testTable)
 	assert.Len(t, testTable.Columns(), 2)
-	assert.Equal(t, "2", testTable.GetColumn("name").Default)
+	assert.Equal(t, "'2'", testTable.GetColumn("name").Default)
 }