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"""Tests of coverage/collector.py and other collectors."""
import re
import coverage
from coverage.backward import StringIO
from tests.coveragetest import CoverageTest
class CollectorTest(CoverageTest):
"""Test specific aspects of the collection process."""
def test_should_trace_cache(self):
# The tracers should only invoke should_trace once for each file name.
# Make some files that invoke each other.
self.make_file("f1.py", """\
def f1(x, f):
return f(x)
""")
self.make_file("f2.py", """\
import f1
def func(x):
return f1.f1(x, otherfunc)
def otherfunc(x):
return x*x
for i in range(10):
func(i)
""")
debug_out = StringIO()
cov = coverage.coverage(
include=["f1.py"], debug=['trace'], debug_file=debug_out
)
# Import the python file, executing it.
self.start_import_stop(cov, "f2")
# Grab all the filenames mentioned in debug output, there should be no
# duplicates.
filenames = re.findall(r"'[^']+'", debug_out.getvalue())
self.assertEqual(len(filenames), len(set(filenames)))
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