Eliminate MM_SERVER_PATH (#24968)

server/channels/testlib/resources.go

@@ -14,6 +14,7 @@ import (
 
 	"github.com/mattermost/mattermost/server/public/model"
 	"github.com/mattermost/mattermost/server/public/utils"
+	"github.com/mattermost/mattermost/server/v8/channels/testlib/testdata"
 	"github.com/mattermost/mattermost/server/v8/channels/utils/fileutils"
 	"github.com/mattermost/mattermost/server/v8/platform/shared/filestore"
 )
@@ -38,7 +39,11 @@ type testResourceDetails struct {
 }
 
 func findFile(path string) string {
-	return fileutils.FindPath(path, fileutils.CommonBaseSearchPaths(), func(fileInfo os.FileInfo) bool {
+	// Use the testdata path to search from the root of the monorepo.
+	searchPaths := fileutils.CommonBaseSearchPaths()
+	searchPaths = append(searchPaths, filepath.Join(testdata.GetPackagePath(), "../../../"))
+
+	return fileutils.FindPath(path, searchPaths, func(fileInfo os.FileInfo) bool {
 		return !fileInfo.IsDir()
 	})
 }
@@ -53,7 +58,11 @@ func findDir(dir string) (string, bool) {
 		return path.Dir(srcPath), true
 	}
 
-	found := fileutils.FindPath(dir, fileutils.CommonBaseSearchPaths(), func(fileInfo os.FileInfo) bool {
+	// Use the testdata path to search from the root of the monorepo.
+	searchPaths := fileutils.CommonBaseSearchPaths()
+	searchPaths = append(searchPaths, filepath.Join(testdata.GetPackagePath(), "../../../"))
+
+	found := fileutils.FindPath(dir, searchPaths, func(fileInfo os.FileInfo) bool {
 		return fileInfo.IsDir()
 	})
 	if found == "" {