Add support for softlinks (copy them instead of their target)

closes #1

pytest_datafiles.py

@@ -9,8 +9,11 @@
 def _copy(src, target):
     if not src.exists():
         raise ValueError("'%s' does not exist!" % src)
+
     if src.isdir():
         src.copy(target / src.basename)
+    elif src.islink():
+        (target / src.basename).mksymlinkto(src.realpath())
     else:  # file
         src.copy(target)
 

tests/_fixture_files/dir6/sparrow_link.jpg

@@ -0,0 +1 @@
+../sparrow.jpg

tests/_fixture_files/sparrow_link.jpg

@@ -0,0 +1 @@
+sparrow.jpg

tests/test_pytest_datafiles.py

@@ -371,3 +371,33 @@ def test_invalid_param(datafiles):
     result.stdout.fnmatch_lines([
         "E*ValueError: 'on_duplicate' must be 'exception', 'ignore' or *",
         ])
+
+@pytest.mark.datafiles(os.path.join(FIXTURE_DIR, 'sparrow_link.jpg'))
+def test_copy_symlink(datafiles):
+    """
+    Verify that symlinks are copied and not their targets.
+    """
+    assert len(datafiles.listdir()) == 1
+    assert (datafiles / 'sparrow_link.jpg').check(link=1)
+
+
+@pytest.mark.datafiles(os.path.join(FIXTURE_DIR, 'dir6'))
+def test_copy_symlink_in_dir(datafiles):
+    """
+    Verify that symlinks are copied and not their targets.
+    """
+    assert len(datafiles.listdir()) == 1
+    assert (datafiles / 'sparrow_link.jpg').check(link=1)
+
+
+@pytest.mark.datafiles(
+    os.path.join(FIXTURE_DIR, 'dir6'),
+    keep_top_dir=True,
+    )
+def test_copy_symlink_in_dir2(datafiles):
+    """
+    Verify that symlinks are copied and not their targets.
+    """
+    assert len(datafiles.listdir()) == 1
+    assert len((datafiles / 'dir6').listdir()) == 1
+    assert (datafiles / 'dir6' / 'sparrow_link.jpg').check(link=1)