diff --git a/testutil.go b/testutil.go
index 43d2d56..9f3ba52 100644
--- a/testutil.go
+++ b/testutil.go
@@ -4,14 +4,22 @@ import (
 	"bufio"
 	"bytes"
 	"fmt"
-	"github.com/yuin/goldmark/util"
 	"os"
 	"runtime/debug"
 	"strconv"
 	"strings"
-	testing "testing"
+
+	"github.com/yuin/goldmark/util"
 )
 
+// TestingT is a subset of the functionality provided by testing.T.
+type TestingT interface {
+	Logf(string, ...interface{})
+	Skipf(string, ...interface{})
+	Errorf(string, ...interface{})
+	FailNow()
+}
+
 type MarkdownTestCase struct {
 	No       int
 	Markdown string
@@ -21,7 +29,7 @@ type MarkdownTestCase struct {
 const attributeSeparator = "//- - - - - - - - -//"
 const caseSeparator = "//= = = = = = = = = = = = = = = = = = = = = = = =//"
 
-func DoTestCaseFile(m Markdown, filename string, t *testing.T) {
+func DoTestCaseFile(m Markdown, filename string, t TestingT) {
 	fp, err := os.Open(filename)
 	if err != nil {
 		panic(err)
@@ -77,13 +85,13 @@ func DoTestCaseFile(m Markdown, filename string, t *testing.T) {
 	DoTestCases(m, cases, t)
 }
 
-func DoTestCases(m Markdown, cases []MarkdownTestCase, t *testing.T) {
+func DoTestCases(m Markdown, cases []MarkdownTestCase, t TestingT) {
 	for _, testCase := range cases {
 		DoTestCase(m, testCase, t)
 	}
 }
 
-func DoTestCase(m Markdown, testCase MarkdownTestCase, t *testing.T) {
+func DoTestCase(m Markdown, testCase MarkdownTestCase, t TestingT) {
 	var ok bool
 	var out bytes.Buffer
 	defer func() {
diff --git a/testutil_test.go b/testutil_test.go
new file mode 100644
index 0000000..2ab24a6
--- /dev/null
+++ b/testutil_test.go
@@ -0,0 +1,7 @@
+package goldmark
+
+import "testing"
+
+// This will fail to compile if the TestingT interface is changed in a way
+// that doesn't conform to testing.T.
+var _ TestingT = (*testing.T)(nil)