save() and html_report() prevent further metric gathering · Issue #448 · nedbat/coveragepy (original) (raw)

Originally reported by Michael Crouch (Bitbucket: creidieki, GitHub: creidieki)

When you call coverage.save() it seems to prevent anything else from being read in, for example, html reports. For example, the following program shows 2 lines covered (the bodies of f1 and f2):

#!python

import coverage

cov = coverage.Coverage()
cov.start()

def f1():
    print 2

def f2():
    print 3

f1()
#cov.save()
f2()
cov.html_report()

However, if you uncomment the "cov.save()" line, it only shows the body of f1() as covered -- it doesn't record the body of f2().

cov.html_report() has the same problem when it's run between f1() and f2().

I'm not sure if this behavior is intended, but the documentation of save() and html_report() don't mention it.

I encountered this behavior while trying to find a "quick and dirty" solution for finding coverage information for the server side of a client/server application. I added cov.start() to the server initialization and added cov.html_report() to an existing server call, with the plan on just making that call to write out the currently-collected coverage information.

• Bitbucket: https://bitbucket.org/ned/coveragepy/issue/448