add cocotb as a test dependency (not an install dependency)

diff --git a/setup.py b/setup.py
index 941365590be844ebd91988c13d04172de066bd7d..b57c2e4587251ef5acd8da52d0ca8f77b4631e4d 100644 (file)
--- a/setup.py
+++ b/setup.py
@@ -26,6 +26,10 @@ setup(
 
     # removing cocotb, causing unnecessary dependency and install problems
     install_requires=["setuptools", "nmigen", "nmigen-soc", "modgrammar"],
+
+    # unit tests require cocotb: main operation does not
+    tests_require=['cocotb'],
+
     include_package_data=True,
     packages=find_packages(),
     project_urls={