Fix tests for GitHub windows platform

The tests were failing because of differences in file paths.  It was
comparing:

    C:\Users\runneradmin\AppData\...

to:

    C:\Users\RUNNER~1\AppData\...

and failing.  These changes normalize the file paths so the comparisons
work properly.

Author: nedbat

tests/test_api.py

@@ -18,7 +18,7 @@
 from coverage import env
 from coverage.backward import code_object, import_local_file, StringIO
 from coverage.data import line_counts
-from coverage.files import abs_file
+from coverage.files import abs_file, relative_filename
 from coverage.misc import CoverageException
 
 from tests.coveragetest import CoverageTest, CoverageTestMethodsMixin, TESTS_DIR, UsingModulesMixin
@@ -472,16 +472,16 @@ def test_ordered_combine(self):
         # The order of the [paths] setting matters
         def make_data_file():
             data = coverage.CoverageData(".coverage.1")
-            data.add_lines({os.path.abspath('ci/girder/g1.py'): dict.fromkeys(range(10))})
-            data.add_lines({os.path.abspath('ci/girder/plugins/p1.py'): dict.fromkeys(range(10))})
+            data.add_lines({abs_file('ci/girder/g1.py'): dict.fromkeys(range(10))})
+            data.add_lines({abs_file('ci/girder/plugins/p1.py'): dict.fromkeys(range(10))})
             data.write()
 
         def get_combined_filenames():
             cov = coverage.Coverage()
             cov.combine()
             cov.save()
             data = cov.get_data()
-            filenames = {os.path.relpath(f).replace("\\", "/") for f in data.measured_files()}
+            filenames = {relative_filename(f).replace("\\", "/") for f in data.measured_files()}
             return filenames
 
         # Case 1: get the order right.

tests/test_files.py

@@ -25,7 +25,7 @@ class FilesTest(CoverageTest):
 
     def abs_path(self, p):
         """Return the absolute path for `p`."""
-        return os.path.join(os.getcwd(), os.path.normpath(p))
+        return os.path.join(abs_file(os.getcwd()), os.path.normpath(p))
 
     def test_simple(self):
         self.make_file("hello.py")

tests/test_html.py

@@ -18,7 +18,7 @@
 import coverage
 from coverage.backward import unicode_class
 from coverage import env
-from coverage.files import flat_rootname
+from coverage.files import abs_file, flat_rootname
 import coverage.html
 from coverage.misc import CoverageException, NotPython, NoSource
 from coverage.report import get_analysis_to_report
@@ -635,6 +635,8 @@ def compare_html(expected, actual):
         # The temp dir the tests make.
         (filepath_to_regex(os.getcwd()), 'TEST_TMPDIR'),
         (filepath_to_regex(flat_rootname(unicode_class(os.getcwd()))), '_TEST_TMPDIR'),
+        (filepath_to_regex(abs_file(os.getcwd())), 'TEST_TMPDIR'),
+        (filepath_to_regex(flat_rootname(unicode_class(abs_file(os.getcwd())))), '_TEST_TMPDIR'),
         (r'/private/var/folders/[\w/]{35}/coverage_test/tests_test_html_\w+_\d{8}', 'TEST_TMPDIR'),
         (r'_private_var_folders_\w{35}_coverage_test_tests_test_html_\w+_\d{8}', '_TEST_TMPDIR'),
     ]

tests/test_process.py

@@ -20,7 +20,7 @@
 import coverage
 from coverage import env
 from coverage.data import line_counts
-from coverage.files import python_reported_file
+from coverage.files import abs_file, python_reported_file
 from coverage.misc import output_encoding
 
 from tests.coveragetest import CoverageTest, TESTS_DIR, xfail
@@ -390,8 +390,8 @@ def test_combine_with_aliases(self):
         data.read()
         summary = line_counts(data, fullpath=True)
         self.assertEqual(len(summary), 1)
-        actual = os.path.normcase(os.path.abspath(list(summary.keys())[0]))
-        expected = os.path.normcase(os.path.abspath('src/x.py'))
+        actual = abs_file(list(summary.keys())[0])
+        expected = abs_file('src/x.py')
         self.assertEqual(expected, actual)
         self.assertEqual(list(summary.values())[0], 6)