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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.
# TODO: Might be better to do this with a mocked _should_trace,
# rather than by examining debug output.
# 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)
""")
# Trace one file, but not the other, and get the debug output.
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.
trace_lines = [
l for l in debug_out.getvalue().splitlines()
if l.startswith(("Tracing ", "Not tracing "))
]
filenames = [re.search(r"'[^']+'", l).group() for l in trace_lines]
self.assertEqual(len(filenames), len(set(filenames)))
# Double-check that the tracing messages are in there somewhere.
self.assertGreater(len(filenames), 5)
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