Theme test failures on Windows

[SergeyBiryukov]

Background: #39975, #40856.

As previously mentioned in comment:4:ticket:39975 and recently confirmed by @davidbaumwald, [48463] uncovered some theme file test failures that were previously skipped:

There were 5 failures:

1) Tests_WP_Customize_Manager::test_import_theme_starter_content
Expected reuse of non-auto-draft attachment.
Failed asserting that an array contains 949.

S:\home\wordpress.test\develop\tests\phpunit\tests\customize\manager.php:691

2) Test_Theme_File::test_theme_file_uri_returns_valid_uri with data set #0 ('parent-only.php', 'theme-file-parent', array('theme-file-parent'))
Failed asserting that two strings are identical.
--- Expected
+++ Actual
@@ @@
-''
+'S:\home\wordpress.test\develop\tests\phpunit\includes/../data/themedir1/default/parent-only.php'

S:\home\wordpress.test\develop\tests\phpunit\tests\link\themeFile.php:136

3) Test_Theme_File::test_theme_file_uri_returns_valid_uri with data set #1 ('child-only.php', 'theme-file-child', array('theme-file-child'))
Failed asserting that two strings are identical.
--- Expected
+++ Actual
@@ @@
-''
+'S:\home\wordpress.test\develop\tests\phpunit\includes/../data/themedir1/default/child-only.php'

S:\home\wordpress.test\develop\tests\phpunit\tests\link\themeFile.php:136

4) Test_Theme_File::test_theme_file_uri_returns_valid_uri with data set #2 ('parent-and-child.php', 'theme-file-child', array('theme-file-parent', 'theme-file-child'))
Failed asserting that two strings are identical.
--- Expected
+++ Actual
@@ @@
-''
+'S:\home\wordpress.test\develop\tests\phpunit\includes/../data/themedir1/default/parent-and-child.php'

S:\home\wordpress.test\develop\tests\phpunit\tests\link\themeFile.php:136

5) Test_Theme_File::test_theme_file_uri_returns_valid_uri with data set #3 ('neither.php', 'theme-file-parent', array())
Failed asserting that two strings are identical.
--- Expected
+++ Actual
@@ @@
-''
+'S:\home\wordpress.test\develop\tests\phpunit\includes/../data/themedir1/default/neither.php'

S:\home\wordpress.test\develop\tests\phpunit\tests\link\themeFile.php:136

It's not quite clear yet whether it's an issue with the tests or with the functions being tested.

[SergeyBiryukov]

Related: #51111

[SergeyBiryukov]

Replying to SergeyBiryukov:

1) Tests_WP_Customize_Manager::test_import_theme_starter_content
Expected reuse of non-auto-draft attachment.
Failed asserting that an array contains 949.

S:\home\wordpress.test\develop\tests\phpunit\tests\customize\manager.php:691

This appears to be resolved in [54519] / #56807, see comment:11:ticket:56807.