Fix depfile tests on Windows.

tests/build/depfile.srctree

+"""
 PYTHON -m Cython.Build.Cythonize -M foo.pyx
 PYTHON check.py
+"""
 
 ######## foo.pyx ########
 
@@ -25,9 +27,7 @@ cdef inline void empty():
 
 ######## check.py ########
 
-import os
-
 with open("foo.c.dep", "r") as f:
-    contents = f.read().replace("\n", " ").replace("\\", "")
+    contents = f.read().replace("\\\n", " ").replace("\n", " ")
 
 assert sorted(contents.split()) == ['bar.pxd', 'baz.pxi', 'foo.c:', 'foo.pyx'], contents

tests/build/depfile_numpy.srctree

 # tag: numpy
 
+"""
 PYTHON -m Cython.Build.Cythonize -M dep_np.pyx
 PYTHON check_np.py
+"""
 
 ######## dep_np.pyx ########
 
@@ -12,14 +14,13 @@ np.import_array()
 
 ######## check_np.py ########
 
-import os
-import re
+import os.path
 
 import numpy as np
 import Cython
 
 with open("dep_np.c.dep", "r") as f:
-    contents = f.read().replace("\n", " ").replace("\\", "")
+    contents = f.read().replace('\\\n', ' ').replace('\n', ' ')
 
 contents = contents.split()
 
@@ -29,7 +30,11 @@ contents = [fname.replace(cy_prefix, "cy_prefix") for fname in contents]
 np_prefix, _ = os.path.split(np.__file__)
 contents = [fname.replace(np_prefix, "np_prefix") for fname in contents]
 
-expected = ['cy_prefix/Includes/cpython/buffer.pxd',
+contents = [path.split(os.sep) for path in contents]
+contents.sort()
+
+expected = [path.split('/') for path in [
+    'cy_prefix/Includes/cpython/buffer.pxd',
     'cy_prefix/Includes/cpython/mem.pxd',
     'cy_prefix/Includes/cpython/object.pxd',
     'cy_prefix/Includes/cpython/ref.pxd',
@@ -37,13 +42,15 @@ expected = ['cy_prefix/Includes/cpython/buffer.pxd',
     'cy_prefix/Includes/libc/stdio.pxd',
     'cy_prefix/Includes/libc/string.pxd',
     'dep_np.c:',
-    'dep_np.pyx',]
+    'dep_np.pyx',
+]]
 
 # Also account for legacy numpy versions, which do not ship
 # `__init__.pxd` hence the fallback is used:
-if 'cy_prefix/Includes/numpy/__init__.pxd' in contents:
-    expected.append('cy_prefix/Includes/numpy/__init__.pxd')
+if ['cy_prefix', 'Includes', 'numpy', '__init__.pxd'] in contents:
+    expected.append(['cy_prefix', 'Includes', 'numpy', '__init__.pxd'])
 else:
-    expected.append('np_prefix/__init__.pxd')
+    expected.append(['np_prefix', '__init__.pxd'])
 
-assert sorted(contents) == sorted(expected), sorted(contents)
+expected.sort()
+assert contents == expected, contents

tests/build/depfile_package.srctree

-'''
+"""
 PYTHON -m Cython.Build.Cythonize -i pkg --depfile
 PYTHON package_test.py
-'''
+"""
 
 ######## package_test.py ########
 
-import os
+import os.path
 
 with open("pkg/test.c.dep", "r") as f:
-    contents = f.read().replace("\n", " ").replace("\\", "")
+    contents = f.read().replace("\\\n", " ").replace("\\\n", " ")
 
-assert sorted(contents.split()) == sorted(['test.c:', 'sub/incl.pxi', 'test.pxd', 'test.pyx']), contents
+assert sorted(contents.split()) == sorted(['test.c:', os.path.join('sub', 'incl.pxi'), 'test.pxd', 'test.pyx']), contents
 
 
 with open("pkg/sub/test.c.dep", "r") as f:
@@ -18,7 +18,7 @@ with open("pkg/sub/test.c.dep", "r") as f:
 
 contents = [os.path.relpath(entry, '.')
             if os.path.isabs(entry) else entry for entry in contents.split()]
-assert sorted(contents) == sorted(['test.c:', 'incl.pxi', 'test.pyx', '../test.pxd']), contents
+assert sorted(contents) == sorted(['test.c:', 'incl.pxi', 'test.pyx', os.path.join('..', 'test.pxd')]), contents
 
 
 ######## pkg/__init__.py ########
@@ -55,4 +55,3 @@ TEST = 'pkg.sub.test'
 ######## pkg/sub/incl.pxi ########
 
 pass
-