获取ruby单元测试中断言错误的"回溯"

Question

在为单元测试创​​建辅助方法时,故障的控制台输出仅指示实际断言发生的行.

# Just an example method.
def test_equal(a, b)
  assert_equal a, b # Error indicates this line
end

test_equal(1, 2) # I'd like to know this line
test_equal(2, 3)

有没有办法显示类似"回溯"的内容或为这些断言错误提供更多上下文？

Answer 1

我已经进一步分析了这个问题,偶然发现了minitest的方法Assertion.location.在那里,它经历了回溯(失败的断言导致类型的异常Minitest::Assertion < Exception),将其反转并查找以下列关键字之一开头的方法:

• assert
• refute
• flunk
• pass
• fail
• raise
• must
• wont

因此,原始问题中的示例应如下所示:

# Just an example method.
def assert_my_equal(a, b)
  assert_equal a, b # Error indicates this line
end

assert_my_equal(1, 2) # This is the line number indicated in the failure report
assert_my_equal(2, 3)

这也解释了为什么特定于Rails的断言方法表现正确:它们始于assert_.