fix test

Author: wxiaoguang

tests/integration/api_repo_file_helpers.go

@@ -69,6 +69,6 @@ func createOrReplaceFileInBranch(user *user_model.User, repo *repo_model.Reposit
 
 // TODO: replace all usages of this function with testCreateFileInBranch or testCreateFile
 func createFile(user *user_model.User, repo *repo_model.Repository, treePath string, optContent ...string) (*api.FilesResponse, error) {
-	content := util.OptionalArg(optContent, "file content "+treePath)
+	content := util.OptionalArg(optContent, "This is a NEW file") // some tests need this default content because its SHA is hardcoded
 	return createFileInBranch(user, repo, createFileInBranchOptions{}, map[string]string{treePath: content})
 }