Add coverage support

Author: martenj

requirements.txt

@@ -1,6 +1,7 @@
 astroid==3.3.10
 asttokens==3.0.0
 contourpy==1.3.2
+coverage==7.9.2
 cycler==0.12.1
 decorator==5.2.1
 dill==0.4.0
@@ -29,6 +30,7 @@ Pygments==2.19.2
 pylint==3.3.7
 pyparsing==3.2.3
 pytest==8.4.1
+pytest-cov==6.2.1
 python-dateutil==2.9.0.post0
 six==1.17.0
 stack-data==0.6.3