如何获得机架单元以显示堆栈跟踪？

Question

我在我的代码中使用了这样的rackunit

(run-tests (test-suite "suite-name"
  (test-case "case name"
     ...
   ))

我正在尝试练习TDD。当断言失败时，我可以看到哪个断言失败。但不幸的是，如果发生错误，rackunit只会向我显示遇到的错误和失败的测试用例名称。

如果我正常执行代码，则会看到带有行号的堆栈跟踪。如何使机架单元显示此信息？

Answer 1

使用errortrace。

作为示例，以下程序

#lang racket/base

(require rackunit
         rackunit/text-ui)

(define suite
  (test-suite "suite-name"
    (test-case "case name"
      (check-equal? (1) 3))))

(run-tests suite)

产生：

--------------------
suite-name > case name
ERROR

application: not a procedure;
 expected a procedure that can be applied to arguments
  given: 1
  arguments...: [none]
--------------------
0 success(es) 0 failure(s) 1 error(s) 1 test(s) run
1

[当您使用racket test.rkt运行时。

但是如果我们用racket -l errortrace -t test.rkt运行它，则会产生：

--------------------
suite-name > case name
application: not a procedure;
 expected a procedure that can be applied to arguments
  given: 1
  arguments...: [none]
  errortrace...:
   /Users/sorawee/racket/test.rkt:9:20: (1)
   /Applications/Racket v7.7/share/pkgs/rackunit-lib/rackunit/private/check.rkt:115:13: ((let-values (((...it/private/check.rkt:115:14) check-impl) ((temp3) (idY31 lifted/19 (....))) ((temp4) (quote (....)))) ((checked-procedure-check-and-extract struct:keyword-procedure ...it/private/check.rkt:115:14 keyword-procedure-extract (....) ....)...
   /Applications/Racket v7.7/share/pkgs/rackunit-lib/rackunit/private/test-case.rkt:58:2: (let-values (((...rivate/test-case.rkt:58:2) run-test-case5) ((temp1) (lambda () (void) (....))) ((temp2) (lifted/20 (quote ....)))) (if (variable-reference-constant? (#%variable-reference run-test-case5)) (run-test-case temp2 temp1) ((checked-procedure...
   /Users/sorawee/racket/test.rkt:11:0: (run-tests suite)

application: not a procedure;
 expected a procedure that can be applied to arguments
  given: 1
  arguments...: [none]
--------------------
0 success(es) 0 failure(s) 1 error(s) 1 test(s) run
1