title: How to properly assert that an exception gets raised in pytest?
body: <h2>Code:</h2>
  
  <pre><code># coding=utf-8
  import pytest
  
  
  def whatever():
      return 9/0
  
  def test_whatever():
      try:
          whatever()
      except ZeroDivisionError as exc:
          pytest.fail(exc, pytrace=True)
  </code></pre>
  
  <h2>Output:</h2>
  
  <pre><code>================================ test session starts =================================
  platform linux2 -- Python 2.7.3 -- py-1.4.20 -- pytest-2.5.2
  plugins: django, cov
  collected 1 items 
  
  pytest_test.py F
  
  ====================================== FAILURES ======================================
  ___________________________________ test_whatever ____________________________________
  
      def test_whatever():
          try:
              whatever()
          except ZeroDivisionError as exc:
  &gt;           pytest.fail(exc, pytrace=True)
  E           Failed: integer division or modulo by zero
  
  pytest_test.py:12: Failed
  ============================== 1 failed in 1.16 seconds ==============================
  </code></pre>
  
  <p>How to make pytest print traceback, so I would see where in the <code>whatever</code> function an exception was raised?</p>