Revert "Update newline tests"

This reverts commit 18704a5e21.

tests/integration/test_project.py

@@ -83,25 +83,25 @@ six = {{version = "*", index = "pypi"}}
 def test_maintain_file_line_endings(PipenvInstance, pypi, newlines, target):
     with PipenvInstance(pypi=pypi, chdir=True) as p:
         path = getattr(p, target)
+
         c = p.pipenv('install')
         assert c.return_code == 0
 
         with io.open(path) as f:
             contents = f.read()
-            written_newlines = f.newlines
 
         assert f.newlines == u'\n'
-        if target == 'lockfile_path':
-            project = Project()
-            project._lockfile_newlines = newlines
-            project.write_lockfile(contents)
-        else:
-            with io.open(path, 'w', newline=newlines) as f:
-                f.write(contents)
+
+        with io.open(path, 'w', newline=newlines) as f:
+            f.write(contents)
+
+        before = os.path.getmtime(path)
 
         c = p.pipenv('install chardet')
         assert c.return_code == 0
 
+        assert os.path.getmtime(path) != before
+
         with io.open(path) as f:
             f.read()
             actual_newlines = f.newlines