[tests] giveup running tests via setup

Complete tests can be runned via pytest or unittest. It is not
necessary to run it via setup. pytest-runner has a deprecation
notice and the test command is removed from setuptools in 2019.

Bug: T335645
Change-Id: I0c04a554efcaf21aefca6783198e89f8585d3893
---
M dev-requirements.txt
M tests/README.rst
2 files changed, 16 insertions(+), 10 deletions(-)

diff --git a/dev-requirements.txt b/dev-requirements.txt
index 97309d8..8df802e 100644
--- a/dev-requirements.txt
+++ b/dev-requirements.txt
@@ -5,7 +5,6 @@
 pytest-cov >= 3.0.0; python_version>="3.10"
 pytest-cov >= 2.11.1; python_version<"3.10"
 pytest-timeout
-pytest-runner
 pytest-subtests >= 0.3.2
 pytest-attrib>=0.1.3
 
diff --git a/tests/README.rst b/tests/README.rst
index cd07199..bff07ea 100644
--- a/tests/README.rst
+++ b/tests/README.rst
@@ -22,14 +22,6 @@
 
 The entire suite of tests may be run in the following ways from the root directory:
 
-**setup.py**
-
-::
-
-    pip install pytest
-    pip install pytest-runner
-    python setup.py pytest
-
 **Module unittest**
 
 ::
@@ -40,7 +32,8 @@
 
 ::
 
-    py.test
+    pip install pytest
+    pytest
 
 **tox**
 

