Fix missing m.Run() in TestMain (#21341)

Backport #21340, add the missing m.Run()

modules/markup/html_test.go

@@ -7,6 +7,7 @@ package markup_test
 import (
 	"context"
 	"io"
+	"os"
 	"strings"
 	"testing"
 
@@ -32,6 +33,7 @@ func TestMain(m *testing.M) {
 	if err := git.InitSimple(context.Background()); err != nil {
 		log.Fatal("git init failed, err: %v", err)
 	}
+	os.Exit(m.Run())
 }
 
 func TestRender_Commits(t *testing.T) {
@@ -336,7 +338,7 @@ func TestRender_emoji(t *testing.T) {
 		`<p>Some text with <span class="emoji" aria-label="grinning face with smiling eyes">😄</span><span class="emoji" aria-label="grinning face with smiling eyes">😄</span> 2 emoji next to each other</p>`)
 	test(
 		"😎🤪🔐🤑❓",
-		`<p><span class="emoji" aria-label="smiling face with sunglasses">😎</span><span class="emoji" aria-label="zany face">🤪</span><span class="emoji" aria-label="locked with key">🔐</span><span class="emoji" aria-label="money-mouth face">🤑</span><span class="emoji" aria-label="question mark">❓</span></p>`)
+		`<p><span class="emoji" aria-label="smiling face with sunglasses">😎</span><span class="emoji" aria-label="zany face">🤪</span><span class="emoji" aria-label="locked with key">🔐</span><span class="emoji" aria-label="money-mouth face">🤑</span><span class="emoji" aria-label="red question mark">❓</span></p>`)
 
 	// should match nothing
 	test(

modules/markup/markdown/markdown_test.go

@@ -6,6 +6,7 @@ package markdown_test
 
 import (
 	"context"
+	"os"
 	"strings"
 	"testing"
 
@@ -37,6 +38,7 @@ func TestMain(m *testing.M) {
 	if err := git.InitSimple(context.Background()); err != nil {
 		log.Fatal("git init failed, err: %v", err)
 	}
+	os.Exit(m.Run())
 }
 
 func TestRender_StandardLinks(t *testing.T) {