fix: more relative_files=true fixes. nedbat#1280

CHANGES.rst

@@ -34,6 +34,8 @@ Unreleased
   - A ``[paths]`` setting like ``*/foo`` will now match ``foo/bar.py`` so that
     relative file paths can be combined more easily.
 
+  - The setting is properly interpreted in more places, fixing `issue 1280`_.
+
 - Fixed environment variable expansion in pyproject.toml files.  It was overly
   broad, causing errors outside of coverage.py settings, as described in `issue
   1481`_.  This is now fixed, but in rare cases will require changing your
@@ -43,6 +45,7 @@ Unreleased
   implementations other than CPython or PyPy (`issue 1474`_).
 
 .. _issue 991: https://github.com/nedbat/coveragepy/issues/991
+.. _issue 1280: https://github.com/nedbat/coveragepy/issues/1280
 .. _issue 1407: https://github.com/nedbat/coveragepy/issues/1407
 .. _issue 1474: https://github.com/nedbat/coveragepy/issues/1474
 .. _issue 1481: https://github.com/nedbat/coveragepy/issues/1481

coverage/python.py

@@ -151,7 +151,14 @@ def __init__(self, morf, coverage=None):
 
         filename = source_for_morf(morf)
 
-        super().__init__(canonical_filename(filename))
+        fname = filename
+        canonicalize = True
+        if self.coverage is not None:
+            if self.coverage.config.relative_files:
+                canonicalize = False
+        if canonicalize:
+            fname = canonical_filename(filename)
+        super().__init__(fname)
 
         if hasattr(morf, '__name__'):
             name = morf.__name__.replace(".", os.sep)

coverage/xmlreport.py

@@ -149,7 +149,8 @@ def xml_file(self, fr, analysis, has_arcs):
         # are populated later.  Note that a package == a directory.
         filename = fr.filename.replace("\\", "/")
         for source_path in self.source_paths:
-            source_path = files.canonical_filename(source_path)
+            if not self.config.relative_files:
+                source_path = files.canonical_filename(source_path)
             if filename.startswith(source_path.replace("\\", "/") + "/"):
                 rel_name = filename[len(source_path)+1:]
                 break

tests/test_api.py

@@ -1239,6 +1239,38 @@ def test_combine_no_suffix_multiprocessing(self):
         self.assert_file_count(".coverage.*", 0)
         self.assert_exists(".coverage")
 
+    def test_files_up_one_level(self):
+        # https://github.com/nedbat/coveragepy/issues/1280
+        self.make_file("src/mycode.py", """\
+            def foo():
+                return 17
+            """)
+        self.make_file("test/test_it.py", """\
+            from src.mycode import foo
+            assert foo() == 17
+            """)
+        self.make_file("test/.coveragerc", """\
+            [run]
+            parallel = True
+            relative_files = True
+
+            [paths]
+            source =
+                ../src/
+                */src
+            """)
+        os.chdir("test")
+        sys.path.insert(0, "..")
+        cov1 = coverage.Coverage()
+        self.start_import_stop(cov1, "test_it")
+        cov1.save()
+        cov2 = coverage.Coverage()
+        cov2.combine()
+        cov3 = coverage.Coverage()
+        cov3.load()
+        report = self.get_report(cov3)
+        assert self.last_line_squeezed(report) == "TOTAL 4 0 100%"
+
 
 class CombiningTest(CoverageTest):
     """More tests of combining data."""