Tests: reworked python tests with application.

test/python/204_no_content/wsgi.py

@@ -0,0 +1,4 @@
+def application(environ, start_response):
+
+    start_response('204 No Content', [])
+    return []

test/python/atexit/wsgi.py

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+import atexit
+
+def application(environ, start_response):
+    test_dir = environ.get('HTTP_TEST_DIR')
+
+    def create_file():
+        open(test_dir + '/atexit', 'w')
+
+    atexit.register(create_file)
+
+    start_response('200', [('Content-Length', '0')])
+    return []

test/python/empty/wsgi.py

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+def application(env, start_response):
+    start_response('200', [('Content-Length', '0')])
+    return []

test/python/mirror/wsgi.py

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+def application(environ, start_response):
+
+    content_length = int(environ.get('CONTENT_LENGTH', 0))
+    body = bytes(environ['wsgi.input'].read(content_length))
+
+    start_response('200', [
+        ('Content-Type', environ.get('CONTENT_TYPE')),
+        ('Content-Length', str(len(body)))
+    ])
+    return [body]

test/python/query_string/wsgi.py

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+def application(environ, start_response):
+
+    start_response('200', [
+        ('Content-Length', '0'),
+        ('Query-String', environ.get('QUERY_STRING'))
+    ])
+    return []

test/python/server_port/wsgi.py

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+def application(environ, start_response):
+
+    start_response('200', [
+        ('Content-Length', '0'),
+        ('Server-Port', environ.get('SERVER_PORT'))
+    ])
+    return []

test/python/variables/wsgi.py

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+def application(environ, start_response):
+
+    content_length = int(environ.get('CONTENT_LENGTH', 0))
+    body = bytes(environ['wsgi.input'].read(content_length))
+
+    start_response('200', [
+        ('Content-Type', environ.get('CONTENT_TYPE')),
+        ('Content-Length', str(len(body))),
+        ('Request-Method', environ.get('REQUEST_METHOD')),
+        ('Request-Uri', environ.get('REQUEST_URI')),
+        ('Http-Host', environ.get('HTTP_HOST')),
+        ('Server-Protocol', environ.get('SERVER_PROTOCOL')),
+        ('Custom-Header', environ.get('HTTP_CUSTOM_HEADER'))
+    ])
+    return [body]