Eclipse运行Py.test报错：AttributeError: module 'pytest' has no attribute 'main'

我写了一段简单的Python测试代码：

def inc(x): return x + 1
def test_inc_pass(): assert inc(5) == 6
def test_inc_fail(): assert inc(5) == 5

当我尝试在Eclipse中通过py.test运行器直接执行这些测试时，出现了以下报错：

Traceback (most recent call last):
  File "C:\MojeApps\eclipse\plugins\org.python.pydev.core_7.6.0.202006041357\pysrc\runfiles.py", line 273, in <module>
    main()
  File "C:\MojeApps\eclipse\plugins\org.python.pydev.core_7.6.0.202006041357\pysrc\runfiles.py", line 265, in main
    return pytest.main(argv)
AttributeError: module 'pytest' has no attribute 'main'

我已经尝试过通过pip uninstall pytest和pip install pytest重新安装pytest，但问题依然没有解决。有意思的是，在CMD命令行中运行测试一切正常，执行结果如下：

C:\Development\eclipse_workspace\PySandbox\pytest>pytest
========================================================================= test session starts ==========================================================================
platform win32 -- Python 3.6.5, pytest-6.0.0, py-1.9.0, pluggy-0.13.1
rootdir: C:\Development\eclipse_workspace\PySandbox\pytest
plugins: pydev-0.1.1
collected 2 items
test_sample.py .F [100%]
=============================================================================== FAILURES ===============================================================================
____________________________________________________________________________ test_inc_fail _____________________________________________________________________________
def test_inc_fail():
>       assert inc(5) == 5
E       assert 6 == 5
E        +  where 6 = inc(5)
test_sample.py:9: AssertionError
======================================================================= short test summary info ========================================================================
FAILED test_sample.py::test_inc_fail - assert 6 == 5
==================================================================== 1 failed, 1 passed in 0.14s ======================================================================

我猜测问题出在Eclipse/PyDev的配置上，有没有大佬能给我一些解决建议或者帮助？

内容的提问来源于stack exchange，提问作者otemek