IntelliJ / PyCharm not calling unittest setUpClass

When running unittest, the setUpClass code is not called.
But the test code get's excuted right away. When running this from the command line, the setUpClass is called.

And I've setup the python environment with 3.5 and virtualenv, I'm using the project virtualenv which works fine.

IntelliJ IDEA 2016.3.5
Build #IU-163.13906.18, built on March 6, 2017
Licensed to JetBrainsStarterKit
Subscription is active until March 31, 2017
JRE: 1.8.0_112-release-408-b6 amd64
JVM: OpenJDK 64-Bit Server VM by JetBrains s.r.o

class TestMyCode(unittest.TestCase):
"""Advertiser Tests"""

@classmethod
def setUpClass(cls):
   ''' will never be called '''
  x = 123

def test_one():
    ''' gets called without calling setUpClass first '''
  x = 12345